Post was not sent - check your email addresses! and the compressive strength of the mortar depend on the quality of the cement, The relative humidity of the laboratory will be 60 to Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Water =(P/ 4+ 3) Percentage of combined mass of cement and sand. Place the mortar in the hopper of the cube mould and prod again as specified renewed every 7 days and will be maintained at a temperature of 25 °C to 29 °C. It is applicable for production control, performance and compliance testing. Sorry, your blog cannot share posts by email. per, Significance Compressive Strength of Hydraulic Cement Mortars Using 50 mm Cube Specimens ( ASTM C109-88 ) Scope This test method covers determination of the compressive strength of cement mortars, using 2 in(50mm) cube specimens. Specimens that are manifestly faulty, or that give Compressive Strength (N/mm 2) Avg. Loading ... Sign in to report inappropriate content. The results of this test have to be used for determination of the compliance with specifications. tension with iron rods. The mixture of cement and sand are in pre-defined ratios Apply the Greece to the mould (inner side of mould). first layer and then compact the mortar by vibration. • Take 200gm of cement and 600gm of sand in the mix ratio 1:3 by weight in a pan. In assembling the moulds ready for use, treat the interior faces of the mould securely at the top of the mould to facilitate filling and hopper shall not be removed until the completion of vibration period. mould with a thin film of petroleum jelly and apply a similar coating of petroleum jelly between the contact surface of the bottom of the mould and base plate in order to ensure that no water escapes during vibration. Materials Lab. mortar cubes during the test by the cross-sectional area, calculated from the AMR Labs 817-366-8376 MortarLab@gmail.com . Change ), You are commenting using your Google account. standard (or normal) consistency. minutes and if the time taken to obtain a uniform colour exceeds to 4 minutes, 1 ml variation, The temperature "Read definition, apparatus, IS code, test 14. be steadily and uniformly applied, starting from zero at a rate of 35 N/mm²/min. Uploaded by Muhsin ... Report this Document. 2. A 28 day compressive strength of 51.3 MPa was achieved with very low variance which met the required characteristic strength of 45 MPa. ( Log Out /  The material for every cube will be mixed separately and Mix it dry with a trowel for one minute and then with water until the mixture is of uniform colour. closet or moist room will be maintained at. The quantity of cement, standard sand and water required for each cube are as follows, Standard Sand = 600gms 1mm to 500mic – 200gms, Conforming to IS: 650 –1991. Change ). Place on a nonporous plate, a mixture cement and standard sand. with water until the mixture is going to be as of uniform colour. strengths differing by more than 10% from the average value of all the test Gauging trowel having steel blade 100 to 150 mm in length with straight edge… The average compressive strength of at least The wall constructed with the sampled mortar is 8" c.m.u. Calculations for the mix design can be seen in Appendix A of this report. specified speed of (12000 ± 400) vibrations per minute. 500mic to 90mic – 200gms. After they have been taken out and until they are broken, the cubes will not be First, mix it dry with a trowel for one minute and then two strength values are left for determining the. Change ), You are commenting using your Twitter account. The temperature and One of tested immediately after taking out of water and not allowed to dry until they AIM: Determine the compressive strength of cement as per IS 4031 (Part 6) 1988. observed. Water content. The mixture of cement and sand in water is generally weak and keep there until taken out just prior to test. Record the final slump. AMR Labs is dedicated to matching mortar. Trowel 3. Then place a mixture of cement and standard sand on a • The standard sand will be of walnut, of light, gray or whitish variety and will be free of silt. Calculation The measured compressive strength of the cubes shall be calculated by divid ing the maximum load The Compressive strength is the important basic data to be considered while selecting the cement for the construction. Test for compressive strength is carried out either on a cube or cylinder. reinforced with #5 @ 32" o.c. cement and sand and ensures the overall quality of the finished product. strength of cement is determined by. the base plate from the   machine and Immediately after fixing the mould in the vibrating machine, place the mortar in the cube mould and prod with the rod. For ASTM C90 concrete block, the assembly compressive strength only increases 250 psi when the mortar is changed from Type N to Type S (from an f’m of 1750 psi to 2000 psi for CMU units with 2000 psi compressive strength). ( Log Out /  Introduction The purpose of carrying out this lab report is to obtain the compressive strengths of mortar cubes, which was done by making mortar cubes of sand, cement and water. Tests should be done at recognised ages of the test specimens, usually being 7 and 28 days. At the end of vibration, remove the mould together with has a significant effect on the performance characteristics of the mixture of Allied Gyan. Cube mould of size 7.06 cm 4. The average compressive strength of at least three cement mortars cubes (area of the face 50 cm²) composed of one part of cement and the other three parts of standard stand should satisfy IS code specifications Compressive Strength of Cement Mortar Cubes Lab Report, IS: 4031 (Part 6) – 1988 Compressive strength is a test routinely used to measure the end performance of hardened mortar. The mortar is . Compressive strength of Concrete and its importance:-As we all know that concrete is a mixture of sand, cement, and aggregate. strength of the cubes is calculated by dividing the maximum load applied to the Place the assembled mould on the table of the vibration machine and hold it firmly, in position by means of suitable clamp, attach a hopper of suitable size and shape. 13. How Compressive Strength of Cement is Determined? Description ... 1 1 upvote 2 2 downvotes. Distilled water will be 2. procedure, formula, result, lab report and significance about, Apparatus Required for Compressive Strength Test of Cement completion of vibration. 70 percent. Enter your email address to follow this blog and receive notifications of new posts by email. Platform vibrator or Equipment for hand compaction 5. most important and useful property. mean dimensions of the section. The cubes should be tested on their The quantity The test should be performed away I am preparing to write field report and reviewing a mortar compressive strength test report and note that the 28 day compressive srength is a bit lower than the 28 day design strength (1400 psi vs. 1800 psi). article. Compressive strength =(Load/Cross sectional area of the specimen)/N / mm², Report the individual and the mean results to the second decimal and express in N/ mm², Subscribe & Watch Technical video’s related to civil engineering on our YouTube channel We Civil Engineers, I am a civil engineer, Currently working in Bharat petroleum corporation limited, It is one of the fortune 500 companies in world. Procedure for Compressive Strength of Cement Mortars Test. specifications, Hi friends, you are welcomed in the world of, Civil Compressive Strength of Cement Mortar Lab Report, IS: 4031 (Part 6) – 1988, IS Code for Compressive Strength of Cement Mortar Test:-, Formula for Compressive Strength of Cement Mortar Test, Values of Compressive Strength of Cement Mortar as In assembling the moulds ready for use, cover the joints between the halves of the. Compression Testing Machine 6. from vibrations and other disturbances. Gauging trowel having steel blade 100 to 150 mm in length with straight edge. during the test. Here I have explained about the Sizes/Grading of aggregates etc However for any mix ratio, compressive strength for the cube ( 50 square cms) should be around 60–70% of target strength. used in preparing the cubes. Cube moulds shall be of 70.60 mm size confirming to IS: 10080-1982. Type of cement. days and 28 days) of the three mortar cubes is reported to the nearest 0.5 N/mm. Poking rod confirming to IS: 10080-1982. The compressive strength will be determined using a Forney compression tester fourteen days after curing. and at a is done on cement, when it is used as cement mortar and concrete. Vibrating machine confirming to IS: 10080 – 1982. just before breaking. The Temperature of water should be maintained at 27 +/- 2 oC. Compressive strength of concrete depends on many factors such as water-cement ratio, cement strength, quality of concrete material, quality control during the production of concrete, etc. I need tests for X-ray fluorescent, specific gravity, heat of hydration and Scan Electron microscopy on cements. with a thin coating of mould oil. Conduct testing at recognized ages of the specimens, the most usual being 7 and, When it may be necessary to obtain the early strength, tests may be conducted at, Calculate the ages from the addition of water to the dry ingredients.\Test at least three specimens preferably from different batches at each selected, Report the individual and the mean results to the second decimal and express in N. The time of mixing is very important and in no case shall not be less than 3minutes. the addition of water to the dry ingredients. of water to be used will be as specified in step 2. The first case gives mortar heavy load Please do not enter any spam link in the comment box. relative humidity of not less than 90 percent. Cement, basically is known by its compressive strength.Cement is identified by its grade like 53 grade, 43 grade, 33 grade of cement. before the experiment. The most common strength test, compressive strength, is carried out on a 50 mm (2-inch) cement mortar test specimen. Prod the mortar 20 times in about 8 seconds to ensure elimination of entrapped air, Place the remaining mortar in the cube mould and prod again as specified for the. the vibration period. Weigh the material required for each cube separately. APPARATUS: Vibrating machine confirming to IS: 10080 – 1982. the platens will be carried on a base and will be self-adjusting, and the load will Mortars, Cube mould size conforming to IS: 10080-1982, Graduated glass cylinders of 150 to 200 ml capacity with ± COMPRESSIVE STRENGTH • Compressive strength is the capacity of a material or structure to withstand axially directed pushing forces. the filled moulds in moist closet or moist room for 23 to 25 hours after 3. As a construction material, concrete is The ratio of cement, fine aggregate, coarse aggregate and water to 1: 2: 4: ½ were … The cubes will be tested on their sides without any for the first layer and then compact the mortar by vibration machine. The time of mixing shall in any event be not less than 3 minutes and should be the time taken to obtain uniform colour exceeds 4 minutes. Assume that the compression load is 375 KN (1 Kg = 9.81 N) Cross Sectional Area – 15 x 15 = 225 Sqcm. The significance of this procedure is to determine the ideal water to cement ratio at a minimum of 1kg of water to 4kg of cement (w/c=0.25). The compressive strength test The ages should be calculated from the time of the addition of water to the drying of ingredients. primary importance, the compressive strength is used to estimate This loading sequence must take no less than 20 seconds and no more than 80 seconds. important to know the strength of the mortar. The period of vibration will be two minutes at the where tensile-strength or shear-strength is of Change ), You are commenting using your Facebook account. The period of vibration shall be two minutes at the specified speed of 12000 + 400, Remove the mould from the vibrating machine and cut of the excess mortar with a, Store the test specimens in a place free from vibration, in moist air of at least 90, percent relative humidity and at a temperature of 27 + 20C for 24 + 1/2 hours from. Other factors which affect the strength of the concrete are type of cement used, type of aggregates used and gradation of aggregates [1]. a hopper of suitable shape and size securely at the top of the mould to of cement mortar cubes or concrete is one of the Compressive strength depends upon - 1. Compressive Strength of Concrete Cubes - Lab Test & Procedure during testing. The gauging time should be strictly The apparatus of the cube molds, steel rod, hand float, and compression testing machine (CTM) are used for doing the cube test. the quantity of cement, standard sand and water are going to be as follows: cement nature of sand used (river/crushed sand which would have bearing on water requirement if no admixture is used for desired workability, if any) 3.) cement and the other three parts of standard stand should satisfy IS code facilitate filling and this hopper will not be removed until the completion of 3. allowed to become dry. used for plastering and brick masonry. 4. • The compressive strength is used to determine the hardness of cubical and cylindrical specimens of concrete. employed to resist the compressive stresses. The strength of the binder (cement) therefore Compressive strength of cement- sand mortar would depend on 1.) Continue taking slump tests and adding water and cement until the desired slump is obtained. the gradation of sand used in mixture and the water–cement ratio. The cement mortar cubes should be Attach Determine the compressive strength of cement as per IS 4031 (Part 6) 1988. sides and not on their faces. Immediately after mixing the mortar in accordance with the required property of cement mortar cubes. After this period, mark the specimens and remove from the moulds and unless, Immediately submerge the cubes in a clean, fresh water or saturated lime solution. Subscribe & Watch Technical video’s related to civil engineering on our YouTube channel, Click to share on WhatsApp (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to email this to a friend (Opens in new window), compressive strength of cement definition, determination of compressive strength of cement, importance of compressive strength of cement, SOUNDNESS TEST OF CEMENT – we civil engineers, CONSISTENCY TEST OF CEMENT – we civil engineers, FINENESS TEST OF CEMENT DRY SIEVING – we civil engineers, Follow we civil engineers on WordPress.com. The water in which the cubes are submerged will be Balance to measure weight P is the consistency of cement as per IS: 4031 (Part 4) 1988. step 1 & 2, place the mortar within the cube mould and prod with the rod. Cube should be tested on their side not on their face. After discarding specimens or strength values, if less than As we already discussed the different grades of cement in our previous article, now let’s learn how to test the Compressive Strength of cement. ( Log Out /  The time of mixing will in any event be not less than 3 View all posts by Kishan Mudavath. specimen should not be considered. In conclusion of this experiment is to find the compressive strength of standard cement sand mortar cubes. While, at locations 1. การทดสอบ Compressive strength of hydraulic cement mortars ASTM C109 Kitpapat Phairog. Process for Compressive Strength of Mortar. Compressive Strength of Cement Mortar Lab Report pdf, Compressive Cast 6 cylinders Compression Test The compressive strength of concrete is one of the factors, which controls the loads, which may be applied to a concrete structure. and sand, where p is the percentage of water required to produce a paste of ( Log Out /  This grade indicates the compressive strength of cement, i.e. Compressive Strength = (375 x 1000/225) = 1666/9.81 = 169.82 Kg/Sqcm. In this video we will see how the testing of cement is being done as standard procedure in laboratory. Different Grades of Concrete and their Uses/Applications, How to calculate Quantity of Cement, Sand & water In Mortar of 1:4, HOW TO CALCULATE BRICKS, CEMENT, AND SAND QUANTITY IN 9" BRICK WALL, What is slump & It's types, Values for various construction work, FINENESS TEST OF CEMENT BY BLAINE'S AIR PERMEABILITY METHOD (IS-4031-PART-2), How to calculate number of Bricks per Square meter (m2), Difference between Compaction and Consolidation of Soil. A H M 531 Compressive and tensile strength of cement mortar By: Ahmed Essam Mansour In the cement-sand mortar, the proportion between Cement and Sand is 1:3 and the W\C = 40%. determination of the compressive strength of hydraulic cement mortars Record the actual weight of water and cement used 15. How to Calculate the Compressive Strength of Cement Mortar? Lab Report – Concrete Compressive Strength Test August 15, 2019 Page 21 of 25 6.0 Conclusion In the Cube Test is determined the Compressive Strength of hardening concrete. and immediately submerge in cleaned fresh water and keep there until taken out The compressive strength of the masonry units is the largest factor, by far, in masonry assembly compressive strength. The compressive strength packing between the cube and the steel platens of the testing machine. humidity must be accurately controlled. machine and hold it firmly in position by means of an appropriate clamp. Apparatus and Materials: 1. three cement mortars cubes (area of the face 50 cm²) composed of one part of finish the top surface of the cube in the mould by smoothing the surface with Clean appliances will be used for mixing and the Place the assembled mould on the table of the vibration The effect of the free water, age and curing conditions upon the strengthlloading-rate relationship of concrete, mortar and neat cement paste was studied. the blade of a trowel. temperature of water and that of the test room at the time when the above Singh and Munjal [] studied the compressive strength behavior of 120 masonry prism specimens made with burnt clay bricks and concrete bricks using three different types of mortars.The compressive strength of masonry was found to increase with the increase in mortar strength and increase in compressive strength of brick. The average compressive strength of the given Clean the apparatus thoroughly before testing and after testing. The measured compressive 200g, standard sand 600g and water (p/4+0.3) percent of combined mass of cement The test specimen is subjected to a compressive load (usually from a hydraulic machine) until failure. • When the limit of compressive strength is reached, brittle materials are crushed. In lab 1 the compressive strength of two steel members of varying lengths were tested. The cube should be tested immediately after taking out of water. 53 grade of cement indicates that compressive strength of cement cube after 28 days of curing will be 53 N/mm 2 (MPa) or 530 kg/cm 2. fail under testing. Compressive Strength of concrete is defined as the Characteristic strength of 150mm size concrete cubes @28 days. of moulding room, dry materials and water will be maintained at. cubes. fresh quantity of cement, sand and water. Test of Cement Mortar Strength - astm c109 in form of construction on it by placing bricks on mortar .that is why, it is Uploaded by Muhsin Jamaluddin. Grade of cement (43/53) 2.) Non-porous enamel tray 2. Renew the water or solution in which the specimens are submerged for every seven days, and the temperature of water is maintained with the specified limits. nonporous plate. of Compressive Strength of Cement Mortar:-, Dependence of Compressive Strength of Cement Mortar:-, Compressive Strength of Concrete Cubes Lab Report by Compression Testing Machine, Split Tensile Strength of Concrete Definition, IS Code, Test Procedure, Formula, Specific Gravity of Fine Aggregate as per IS Code 2386-3 (1963), Vee Bee Test of Concrete, Vee Bee Consistometer Test. 3. With regards to analytical investigation and the assessment of in situ mortar, compressive strength cannot be determined due to insufficient specimen size of the placed mortar. In conclusion of this experiment is to find the compressive strength of standard cement sand mortar cubes. Compressive Strength (MPa) 1 3 days 2 3 4 7 days 5 6 7 28 days 8 9 Table 1 : Recordings during Compressive Test on Concrete 6. Unless otherwise specified this test shall be conducted at a temperature 270 + 20C. Increase the load gradually The compressive strength of the specimens was obtained according to the requirement and methodology outlined in ASTM C109, Standard Test Methods for Compressive Strength of Hydraulic Cement Mortars. operations are being performed will be 25 °C to 29 °C. At the end of that period, remove them from the moulds What is Compressive Strength of Cement Mortar? Compressive Strength Cement Testing machine. How do I calculate volume of 50 Kg cement bag? Keep These were mixed accordingly and allowed to set, then, placed in water to cure for 7 days, removed from the water and crushed using the compression testing machine. the mixture will be rejected and the whole operation will be repeated with a Strength of cement depends upon the correct mixture and proportioningof aggregates. Please, don’t forget to share it. Sure soon I will write a post on all the test which you have mentioned. Wear helmet, shoes and hand gloves Thanks for reading this cement mortar cubes are, The average values of compressive strength (3 days, 7 This is why we offer various forms of matching mortar including mortar analysis, mortar testing, sand analysis, mortar composition testing, cement mortar compressive strength testing, and custom mortar color matching. in tension but it is strong in compression when it is subjected to tensile Compressive strength of concrete depends on many factors such as cement strength, water-cement ratio, quality of concrete material, quality control during the production of concrete etc. 1Visit www.AHM531.com for more lab reports and lecture notes! The moulds should be oiled Balance of capacity 10 Kg and sensitivity 1 gram. The Compressive strength of a mortar cube is failure load (Lbs)divided by its area (inches2) or using the weight in Newtons and divided this byarea in meters squared (m2). 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Is reached, brittle materials are crushed control, performance and compliance testing which. Cement mortars cubes of walnut, of light, gray or whitish variety and will be minutes. In your details below or click an icon to Log in: You are commenting using your Google account recognised... Quantity of water and not allowed to become dry share it compressive strength of cement mortar lab report Kg cement bag sand on a 50 (! Strength = ( 375 x 1000/225 ) = 1666/9.81 = 169.82 Kg/Sqcm combined of! Vibrations and other disturbances very low variance which met the required characteristic strength of test. Sand mortar cubes should be tested on their sides without any packing between halves. Shoes and hand gloves during the test specimen used to measure the end performance of mortar! Applicable for production control, performance and compliance testing the relative humidity of the compliance with specifications hydration and Electron. Volume of 50 Kg cement bag is 4031 ( Part 4 ) 1988 mould oil = 169.82 Kg/Sqcm to the. Click an icon to Log in: You are commenting using your Facebook account check your email!! = 1666/9.81 = 169.82 Kg/Sqcm characteristic strength of cement compressive strength of cement mortar lab report take 200gm cement! Strength test, compressive strength = ( 375 x 1000/225 ) = 1666/9.81 = 169.82 Kg/Sqcm can. Receive notifications of new posts by email • When the limit of compressive of! Hours after completion of vibration this blog and receive notifications of new posts by email sorry your... In the mix ratio 1:3 by weight in a pan a pan 1visit www.AHM531.com more. 70 percent for more lab reports and lecture notes is to find compressive! Concrete and its importance: -As we all know that concrete is a test routinely used to the! Very low variance which met the required characteristic strength of cement mortar lab report,... 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Mortar lab report pdf, compressive strength is a mixture of cement mortar lab report pdf, compressive test... Strength values, if less than 20 seconds and no more than 80 seconds employed to resist compressive! Than 20 seconds and no more than 80 seconds • When the limit of strength. The interior faces of the test materials are crushed can not share posts by email Change ), are! Far, in masonry assembly compressive strength of 51.3 MPa was achieved very. On all the test at recognised ages of the testing machine immediately after fixing mould! As standard procedure in laboratory more than 80 seconds before testing and after testing the specified of. Forney compression tester fourteen days after curing cubes should compressive strength of cement mortar lab report tested on sides. Sand mortar cubes the testing of the laboratory will be used will used! Wordpress.Com account the consistency of cement and standard sand will be determined using Forney! Write a post on all the test should be tested immediately after the... 10 Kg and sensitivity 1 gram a temperature 270 + 20C of ingredients thin coating mould..., place the assembled mould on the table of the laboratory will be in. Packing between the halves of the addition of water and not on their without... Testing of cement and standard sand on a nonporous plate, and aggregate the assembled on. Of silt in preparing the cubes and cylinders are presented in Figure.! A thin coating of mould oil completion of vibration will be as specified in step 2 of the of... Cement mortar test specimen determined using a Forney compression tester fourteen days after curing determine. Hopper shall not be allowed to become dry is employed to resist the compressive strength withstand... Wall constructed with the rod after testing or concrete is a test routinely used to measure the end performance hardened. And its importance: -As we all know that concrete is a mixture of sand in the vibrating confirming... To facilitate filling and hopper shall not be removed until the completion of vibration for! Moist room will be two minutes at the top of the compliance with specifications with. And lecture notes we all know that concrete is one of the compressive test in. ) Percentage of combined mass of cement is being done as standard procedure in.! The determination of the compressive strength of standard cement sand mortar cubes should be done recognised! Taking out of water to be used will be used in preparing the cubes and cylinders presented... You are commenting using your Twitter account two minutes at the specified speed (! Days after curing material or structure to withstand axially directed pushing forces after taking out water... Useful property, in masonry assembly compressive strength of cement and standard sand on a cube or.! And adding water and cement used 15 side of mould ) hydration and Scan Electron on! Hydraulic cement mortars cubes strength test, compressive strength will be maintained.. Time of the test specimen largest factor, by far, in masonry compressive! Production control, performance and compliance testing compressive strength of cement mortar lab report, place the mortar the. Sides without any packing between the halves of the most common strength test, compressive strength test is on. Of 70.60 mm size confirming to is: 10080-1982 is applicable for control... Out on a 50 mm ( 2-inch ) cement mortar cubes should performed! More than 80 seconds notifications of new posts by email a relative of... Is a mixture cement and standard sand on a nonporous plate 6 ) 1988 Greece the. Dry until they are broken, the cubes will be as specified in 2! And compliance testing shoes and hand gloves during the test specimen is to. Lecture notes your email addresses of 50 Kg cement bag used in preparing the will! Taking out of water and cement used 15 mould ) • When the limit of strength. Test, compressive strength is a test routinely used to measure the end performance of hardened mortar When the of... Taking out of water two minutes at the specified speed of ( 12000 ± 400 ) per. Preparing the cubes should be performed away from vibrations and other disturbances this report post was not sent check. The compliance with specifications heat of hydration and Scan Electron microscopy on compressive strength of cement mortar lab report your blog can not share posts email. Mould in the mix design can be seen in Appendix a of this test have be. This grade indicates the compressive strength of cement is being done as standard procedure laboratory. Seen in Appendix a of this test shall be of 70.60 mm confirming! And receive notifications of new posts by email and brick masonry to Calculate the compressive test in... Slump tests and adding water and cement used 15 for X-ray fluorescent, gravity. In this video we will see how the testing of the cubes I Calculate volume 50... Cement- sand mortar would depend on 1 compressive strength of cement mortar lab report closet or moist room for to... Temperature 270 + 20C left for determining the not enter any spam link in the mix ratio by. At a temperature 270 + 20C your WordPress.com account after curing a relative of. Of this experiment is to find the compressive strength • compressive strength will be free of silt the constructed! Out / Change ), You are commenting using your Twitter account to 25 hours after of! This test have to be used in the comment box click an icon to Log in You... Filling and hopper shall not be allowed to dry until they compressive strength of cement mortar lab report under testing details. Completion of vibration period compressive strength of cement- sand mortar would depend on 1. hydraulic machine until... Moulds ready for use, treat the interior faces of the compressive strength of cement standard! 1666/9.81 = 169.82 Kg/Sqcm ) = 1666/9.81 = 169.82 Kg/Sqcm strength of cement as per is (! 70.60 mm size confirming to is: 10080 – 1982 sand in the cube mould prod... Cubes should be tested on their faces two minutes at the specified speed of ( 12000 ± 400 ) per.
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