Compressive Strength Test of 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.
Note: This article is on Compressive Strength Test on Cement Mortar not on Compressive Strength Test on Concrete
Compressive Strength of any material or structure is the ability to carry the load on its surface without cracking or bending. The compressive strength of a material or structure gives an idea about the load-carrying capacity of that material or structure.
Compressive strength test is a method used to find out the resistance of any material or structure and ability of that structure or material to recover after the application of Compressive force on the surface for a defined period of time.
In the Compressive Strength test we apply a push force on both the faces of specimen and the maximum force the specimen bears without failure is noted down and that is the Compressive strength of that Cement.
Also Read: 6 Tests on Cement | Lab Tests
Compressive strength is calculated as the ratio of the maximum load carried by specimen to the exposed surface area of specimen. The formula for Compressive strength is F=P/A where F is Compressive strength in (MPA), P is load applied in (N) and A is surface area in (sq m).
Compressive strength test of cement done using UTM(Universal Testing Machine) or CTM(Compression testing machine).
To determine Compressive Strength of Cement.
Sr. No. | Days | Weight of Cement Cube (gm) | Cross-Sectional Area (mm²) | Load (N) | Crushing Load (N/mm²) | Average Compressive Strength (MPa) |
---|---|---|---|---|---|---|
1 | ||||||
2 | 7 | |||||
3 | ||||||
4 | ||||||
5 | 14 | |||||
6 | ||||||
7 | ||||||
8 | 28 | |||||
9 |
Note: As per IS: 516-1959 Minimum three specimens should be tested on each testing time (that means three specimens at 7 days, three specimens @ 14 days & 28 days) If the strength of any specimen varies by more than 15% of average strength, such specimen should be rejected.
Exposed Area of Block= 15cm × 15cm = 225cm²
Compressive Strength on 7th day= Maximum Load carried by Specimen / Exposed Area of Block
Exposed Area of Block= 15cm × 15cm = 225cm²
Compressive Strength on 14th day= Maximum Load carried by Specimen / Exposed Area of Block
Exposed Area of Block= 15cm × 15cm = 225cm²
Compressive Strength on 28th day= Maximum Load carried by Specimen / Exposed Area of Block
Average 7 days Compressive Strength =_ _ _ _
Average 14 days Compressive Strength =_ _ _ _
Average 28 days Compressive Strength =_ _ _ _
The compressive strength of cement is the ability of the cement to resist or sustain under the compression.
Compressive Strength of Cement of different grades at 7 and 28 days are given below
A compressive strength test is a method used to find out the resistance of any material or structure and ability of that structure or material to recover after the application of compressive force on the surface for a defined period of time.
In the Compressive Strength test, we apply a push force on both the faces of the specimen and the maximum force the specimen bears without failure is noted down and that is the Compressive strength of that Cement.
(IS:4031-Part 6-1988) is the IS code for the procedure for the tests to evaluate the physical properties of different types of hydraulic cements.
Compressive strength is calculated as the ratio of the maximum load carried by specimen to the exposed surface area of specimen. The formula for Compressive strength is F=P/A where F is Compressive strength in (MPA), P is load applied in (N) and A is surface area in (sq m).
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.
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