Compressive strength test on concrete
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This document describes procedures for testing the compressive strength of concrete cubes. Compressive strength is the maximum load a material can withstand before crushing. The test involves applying an increasing compressive load to molded concrete cubes until failure. Cubes are cured for 7 or 28 days before testing. The compressive strength is calculated by dividing the maximum load by the cross-sectional area of the cube.
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How to determine compressive strength of cement?
Get PPT here
https://civilinsider.com/compressive-strength-test-on-cement/
The compressive strength of hardened cement is the most important of all the properties. Therefore, it is not surprising that the cement is always tested for its strength at the laboratory before the cement is used in important works.
Why the compressive strength test of Cement is important? Compressive Strength Test on Cement mortar is calculated to find out whether the Cement conforms IS specifications or not and whether it can develop required strength or not when used in Concrete.
Any kind of strength testings are not done directly on Cement itself because of properties like shrinkage and cracking. So Compressive strength test on Cement either done in the form of mortar or concrete. In this article, we will take a look at the compressive strength test of cement mortar using standard sand conforming to IS 650-1991.
Non destructive test (ndt) on concrete msu
Non destructive test (NDT) on concrete can evaluate properties without damage. Common NDT methods described include rebound hammer, ultrasonic pulse velocity, half-cell potential, cover meter, core, pull-out, and pull-off tests. Rebound hammer measures surface hardness related to strength. Ultrasonic pulse velocity depends on density and elasticity. Half-cell potential detects corrosion. Cover meter uses magnetism to locate rebar. Core tests are most accurate but damage concrete. Pull-out and pull-off tests evaluate bond strength. NDT allows testing structures at various locations and ages without harming the concrete.
Testing of dry/hardened concrete
1) The document reports on a laboratory experiment to test the compressive and tensile strengths of concrete. Cubes and cylinders were cured for 14 days and then tested.
2) The compressive strength of the cubes was found to be 19.11 N/mm2 on average, while the cylinders was 14.71 N/mm2. The ratio of 0.8 between cylinder and cube strengths was as expected.
3) The tensile strength was found to be 2.05 N/mm2, which is approximately 10% of the compressive strength of the cubes, showing that concrete is weaker in tension.
Ensayo de peso unitario del concreto en estado fresco
This document describes procedures for determining the unit weight of fresh concrete according to standards ASMT C138 and NTP 339.046. The test involves measuring the net mass of concrete by filling a mold and subtracting the mass of the empty mold. The density or unit weight is then calculated by dividing the net mass by the mold volume. Equipment used includes a balance, rod, metal cylindrical mold, and rubber mallet. The procedure involves placing concrete in layers in the mold, compacting each layer, scraping excess, and calculating unit weight from the measured masses and known volume. Results from tests on different mixes fell within the design limits of 2240-2460 kg/m3.
CE244 LAB RAPORU
This document provides procedures for conducting normal consistency, set time, compressive strength, tensile strength, and flexural strength tests on cement paste and mortar samples. It defines key terms and outlines the steps to prepare and test samples using a Vicat apparatus and universal testing machine. The results from 7-day compressive strength tests on cement mortar cubes met the ASTM C52 specification of 83.6 psi. Running additional tests at 1, 3, and 28 days would have shown how strength increases over time.
VTU CBCS SCHEME Concrete Technology. Tests on Harden Concrete
1) The document discusses various destructive and non-destructive tests used to evaluate the properties of hardened concrete, including compressive strength, tensile strength, flexural strength, rebound hammer, and ultrasonic pulse velocity tests.
2) Compressive strength, tensile strength, and flexural strength tests are conducted by applying loads to concrete specimens to failure.
3) Non-destructive tests like rebound hammer and ultrasonic pulse velocity provide indications of concrete strength without damaging specimens.
Cube test REPORT - DCC2042
This test measures the compressive strength of concrete cubes made and cured according to specific standards. It provides a measure of quality control by testing one property, compressive strength, but results can vary depending on test conditions like specimen size and loading rate. The document outlines how to conduct compression tests on concrete cubes to determine if the concrete meets design specifications. Cubes are made, cured, weighed, and tested for compressive strength at various ages to see how strength develops over time. Detailed procedures are provided for casting, curing, operating the compression machine, and analyzing results.
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Compressive strength and Flexural of Hardened Concrete | Jameel Academy
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Compressive strength test on concrete
- 1. COMPRESSIVE STRENGTH TEST ON CONCRETE
- 2. COMPRESSIVE STRENGTH Compressive strength is the capacity of a material or structure to withstand axially directed pushing forces. When the limit of compressive strength is reached, brittle materials are crushed.
- 3. COMPRESSIVE STRENGTH It depends up on cement,aggregate,bond, w/c ratio, curing temperature, and size of specimen. The cube specimen is of the size 15 x 15 x 15 cm. If the largest nominal size of the aggregate does not exceed 20 mm, 10 cm size cubes may also be used as an alternative.
- 4. TEST PROCEDURE It consists of applying a compressive axial load to molded cubes at a rate which is within a prescribed range until failure occurs. compressive strength = maximum load/cross sectional area
- 5. PROCEDURE Prepare a concrete mix with the proportions. Make sure that specimens are clean and greased or oiled thinly. Metal molds should be sealed to their base plates to prevent loss of water. Fill the cubes in three layers, tamping each layer with (25) strokes using a tamper.
- 6. Fill the molds completely, smooth off the tops evenly, and clean up any concrete outside the cubes. Leave the specimens in the curing room for 24 hours. After that the specimens are immersed water for 7 days or 28 days. Before testing, ensure that all testing machine bearing surfaces are wiped clean.
- 7. Carefully center the cube on the lower plate and ensure that the load will be applied to two opposite cast faces of the cube. Without shock, apply and increase the load continuously at a nominal rate within the range of ( 0.2 N/mm2.s to 0.4 N/mm2.s ) until no greater load can be sustained.
- 9. COMPRESSIVE TEST BEFORE LOADING AFTER LOADING
- 10. Compressive strength= P/A Unit; N/mm2 Where P =Applied load (N) A=Area of the specimen (mm2)
- 11. Thank you