Lab report4989259 lab report for construction materials. Assessing shear and compressive strength of reclai med asphalt concrete 359 fig. Three of the test cylinders were tested for compressive strength at 7days and three were tested at 28. Standard test method for compressive strength of cylindrical. Testing the compressive strength of concrete ready.
By this single test one judge that whether concreting has been done properly or not. C1077 practice for agencies testing concrete and concrete aggregates for use in construction and. F3272 houston, tx 77043 11555 clay road suite 100 92091059. It is limited to concrete having a unit weight in excess of 50 lbft 3800 kgm. Paving block compression strength test results using schmidt. Concrete compressive strength can vary from 2500 psi 17. It also discusses different types of cube failure that can occur. Since concrete is composed of elements of variable strength, it is reasonable to assume. Concrete specimens a modification of aashto designation t 22 and astm designation c 39 1. Compressive strength of concrete depends on many factors such as watercement ratio, cement strength, quality of concrete material, quality control during production of concrete etc.
Due to this, compressive strength of bricks is a very important parameter. Compressive strength of concrete is the strength of hardened concrete measured by the compression test. The test is conducted on a compression testing machine. Compression testing of concrete cylinders a nd cores rev.
Following are the procedure for testing the compressive strength of concrete cubes. The strength of the concrete depends upon many factors like individual compressive strength of its constituents cement, sand, aggregate, quality of materials used, air entrainment mix proportions, watercement. It does not measure or predict in any unique way the strength of the concrete in the structure. Use of swiss hammer for estimating compressive strength.
The characteristic strength is defined as the strength of the concrete below which not more than 5% of the. Reports of compressive strength tests provide valuable information to the project. According to wikipedia, compressive strength of concrete is defined as the characteristic strength of 150mm size concrete cubes tested at 28 days. Calculation the measured compressive strength of the cubes shall be calculated by divid ing the maximum load. Uniaxial tension and compression testing of materials. Compressive strength of concrete cube test, procedure.
Lower watercementitious materials ratios will typically result in greater concrete strength. Compressive strength of concrete cube test, procedure, results. Brick chips are also used as a substitute of stone chips in concrete mix where stone is not available or an economic solution is prefared. Therefore, for every significant structure it is important to check the compressive strength from a representative number of concrete cylinders cast from the same batches of concrete used to form the structure. Compressive strength of concrete, report of significance of. Samples of concrete taken from old pavements and tested in compression indicate higher strengths after 25 years th an when the pavement was 1 to 3 years old. Compressive strength of cylindrical concrete specimens. Department of civil and construction engineering strength. As we all know that concrete is a mixture of sand, cement, and aggregate. The compressive strength of concrete is about 4000 psi. It has been accepted for inclusion in fritz laboratory reports by an authorized administrator of lehigh preserve.
Concrete strength is generally dependent on the watercementitious materials ratio, age of the concrete, curing conditions, air content and the ability of the cement paste to bond with the aggregates. Higher strengths up to and exceeding 10,000 psi 70 mpa are specified for certain applications. Structural concrete properties and practice postgraduate course. The figure below shows a typical strength curve of concrete with the passage of time. The capacity of concrete is reported in psi pounds per sq. By performing this test we can predict about manufactured concrete is done properly or not. This is usually called as the characteristic compressive strength of concrete fc fck. Department of civil and construction engineering strength of. As the slenderness ratios of i oomm and 150 mm concrete cubes are both equal to unity, the only factor that can significantly affect the concrete strength is the specimen size. May 18, 2018 compressive strength of concrete and its importance.
Concrete compressive strength can vary from 2500 psi 17 mpa for residential concrete to 4000 psi 28 mpa and higher in commercial structures. Tests for concrete strength are made shortly after it has been placed 7 to 90 days. Under con tinuous favorable conditions, concrete continues to gain strength indefinitely. Lab 1 concrete proportioning, mixing, and testing supplemental lab manual prepared by mutlu ozer objectives concepts background experimental procedure report requirements discussion objectives students make concrete according to the mix design.
For normal field applications, the concrete strength can vary from 10mpa to 60 mpa. The strength of concrete is majorly derived from aggregates, whereas cement and sand contribute binding and workability along with flowability to concrete this is an indepth article on compressive strength of concrete. Research of suface hardness and compressive strength of concrete. This test measures the uniaxial compressive strength of concrete cubes which are made, cured and tested to very specific requirements. How to check compressive strength of concrete civiconcepts. Concrete mixtures can be designed to provide a wide range of mechanical and durability properties to meet the design requirements of a structure. The compressive strength of concrete is one of the factors. It is always tested for acceptance at fairly early ages with respect to the concrete life and for this reason the strength obtained is less than the ultimate strength the concrete will attain. Paving block compression strength test results using schmidt impact hammer type l y 2,4995x 25,22 r 0,905 y,596e0,043x 0,907 30 40 50 60 70 80 90 25 27 29 31 33 35 37 39 41 43 45 rebound values r comp ression stren gth mpa fig.
This paper covers, briefly, the purpose of compressive strength of concrete test cubes, parameters, which can affect the compression strength of concrete, also some basic and advanced apparatus required for the test and the precautions for the test. The compressive strength of concrete is the most common performance measure used by the engineer in designing buildings and other structures. Thus, the lower the wc, the higher the concrete strength. Lab report 5 rubric for concrete strength report all sections. Code and standards requirements for acceptance testing. Test for compressive strength is carried out either on cube or cylinder. Surface hardness and compressive strength of concrete. Compressive strength of concrete cube test pdf, procedure. Fullsize representative bricks should be sampled randomly to cover the whole range color, texture, and sizes from a shipment.
Unless otherwise indicated, strength, as applied to concrete, refers to the ultimate compressive strength of the moistcured concrete at the age of 28 days. One was from concrete made using the wateree station fly ash source which had a compressive strength of about 106 mpa 15,300 psi, sfwim1, and the other from concrete made using the belews creek fly ash source resulting in compressive strength of. Matt huseman 1212 asbury houston, tx 77007 76908989 reg no. The compressive strength is measured by breaking cylindrical concrete specimens in a compressiontesting machine. Compressive strength of concrete, report of significance. Ce 3700 engineering material lab fabricate cement mortar cubes fabricate cylinders, perform slump test perform. Adequatethe writer included most moves and content was mostly accurate and somewhat clear. Lab report 4989259 lab report for construction materials concrete. Compressive strength of concrete is an important element in designing r.
This test procedure is the same as specified in aashto t 22 and astm c 39. Doc compressive strength test on concrete odhiambo. The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested at 28 days f ck as per indian standards aci standards use cylinder of diameter 150 mm and height 300 mm. The test is conducted on a compressiontesting machine. The compressive strength development rate was inferred from the measured compressive strengths. This lab is worth 200 points good the writer included all moves, and content was accurate and clear. The compressive strength of the concrete cylinder is one of the most common performance measures performed by the engineers in the structural design. In all the abovementioned cases, compression load governs. Compressive strength of concrete cube maximum loadarea of the cube. Plastic and hardened state properties of concrete name. Here, the compressive strength of concrete cylinders is determined by applying continuous load over the cylinder until failure occurs. Compressive strength mpa 1 3 days 2 3 4 7 days 5 6 7 28 days 8 9 table 1. Report on compressive strength of concrete cubes customer contractor consultant froject name location. Variation of compressive strength with mixing ratio fig.
Daily temp, f standard curing 48h out moist outside avg daily temp. The compressive strength is calculated from the failure load. Strength level of concrete in the area represented by core tests is considered adequate when the average compressive strength of the three cores is equal to at least 85% of the specified compressive strength and no single core strength is less than 75% of the specified compressive strength. A blank adot concrete test report laboratory card is provided in figure front of 3 card and figure back of card. Investigation of early compressive strength of fly ash. Compressive strength of concrete definition, importance. Concrete being the major consumable material after water makes it quite inquisitive in its nature. The compressive strength of concrete cube test is very important to test that provides an idea about all the characteristics of concrete.
Compressive strength test is conducted during mix proportioning for assessing the quality of concrete cast at site. The compression strength of concrete is a measure of the concrete s ability to resist loads which tend to compress it. Normal distribution curve on test specimens for determining compressive strength. C873c873m test method for compressive strength of concrete cylinders cast in place in cylindrical molds. The compressive strength of concrete is one of the factors, which controls the loads, which may be applied to a concrete structure. The compression strength of concrete is a measure of the concrete s ability to resist loads which tend to. Mcburney abstract compressivetestsof168wallsofcommonbrick,each6feetlongandabout. Bricks are mainly used in construction of wall, floor, cornices and arches. Most concretes are batched to provide an ultimate compressive strength of 2500 to 4000 psi after 28 days. Concrete strength is generally dependent on the watercementitious materials ratio, age of the. Lab report 5 rubric for concrete strength report all. Some applications use higher strengths, greater than 10,000 psi 70 mpa. Series d338 concrete strength hot weather exposure 0 2000 3000 4000 5000 6000 0 10 20 30 40 50 60 70 80 90 age, days compressive strength, psi 60 65 70 75 80 85 avg.
Lane senior research scientist introduction for rigid pavements, the virginia department of transportation s vdot 1993 road and bridge specifications vdot 1993 specified that the concrete have a 28day compressive strength of 20. Descriptionofspecimensandthetestingmethodscontinued. The characteristic strength is defined as the strength of the concrete below which not more than 5% of the test results are. C943 practice for making test cylinders and prisms for determining strength and density of preplacedaggregate concrete in the laboratory. The strength of the concrete is inversely proportional to the watercement ratio wc. Methods for production of highstrength concrete pdf. The determination of compressive strength test of brick is carried out under the specification of astm c6703. Procedure overview this procedure is to be used for determining the compressive strength of concrete cylinders and cores. Compressive strength results are used to ensure that the concrete mixture as delivered meets the requirements of the specified strength. Values obtained will depend on the size and shape of the specimen, batching, mixing procedures, the methods of sampling, molding, and fabrication and.
Fox river sediment glass aggregate omnni project no. The compressive strength is measured by breaking cylindrical concrete specimens in a compression testing machine. Flexural strength and compressive strength develop at different. Astm standard c192 states the compressive strength of concrete cylinders is taken at 7 days, 14 days, and 28 days after the cylinders were made. Surface hardness and compressive strength of concrete free download as powerpoint presentation. High levels of air will reduce the concrete strength. Average strength kgcm 2 compressive strength test of bricks. Compressive strength of concrete cube test pdf, procedure, results the compressive strength of the concrete cube test provides an idea about all the characteristics of concrete. Concrete gains almost 80% of its ultimate strength 28 days after the mixing.
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