Menu

### Compressive strength of concrete after early loading

Over 100 concrete cubes were tested to study the effect of static uniaxial compressive loading on the strength development at 28 days. From the results the following conclusions have been drawn. (a) Loading specimens to failure at early ages reduces the strength at 28 days.

Get Price### How to Calculate Compressive Strength | Sciencing

So the compressive strength of your sample is 2,512 psi. Incidentally, this meshes with the standard 2,500 psi compressive strength of concrete for residential applications; concrete for commercial structures can have a compressive strength of 4,000 psi or more.

Get Price### Compression Test on Concrete Building Research Institute ...

Compression Test of the Concrete Specimen is most widely used test to measure its compressive strength. Two types of concrete specimen: Cubes Cylinders are used for this purpose: Cubes of size 150mm are more common in Asia, Russia European countries while Cylinders of 150mm in diameter 300mm high are common in and Australia.

Get Price### Civil Engineering: Compressive Strength of Concrete Cube Test

Procedure: Compressive Strength Test of Concrete Cubes. These specimens are tested by compression testing machine after 7 days curing or 28 days curing. Load should be applied gradually at the rate of 140 kg/cm2 per minute till the Specimens fails. Load at the failure divided by area of specimen gives the compressive strength of concrete.

Get Price### METHOD OF TEST FOR COMPRESSIVE STRENGTH OF .

Calculation of Compressive Strength for a Set of Two Large Cylinders Where a set of two 150 mm diameter and 300 mm long cylinders is tested, the compressive strength of the set shall be obtained by calculating the compressive strength of each cylinder and the mean compressive strength of .

Get Price### COMPRESSIVE STRENGTH

Concrete made with highearly strength cement shall have a 7day strength equal to the specified 28day strength for concrete made with Type I or II portland cement.

Get Price### How to calculate the compressive strength of concrete ...

Oct 23, 2009· For a concrete sample that is broken after 28 days. The cylinder is 6" diameter, so it has an area of x Diameter squared /4. A = x 6 x 6/4. A = square inches. If the force required to break the cylinder was 97,500 pounds. Then the compressive strength is 97,500 pounds / square inches = 3,450 psi.

Get Price### Some concrete specification requires the testing of ...

Instead, 28day compressive strength test results are commonly adopted for acceptance purpose. 7day compressive strength test results are often used to monitor the gain of early strength and they are estimated to be about 64% to 70% of the 28day strength.

Get Price### Prediction of 28day Compressive Strength of Concrete .

AbstractPredicting 28day compressive strength of concrete is an important research task for many years. In this study, concrete specimens were cured in two phases, initially at room temperature for a maximum of 30 h and later at a higher temperature for accelerated curing for a maximum of 3 h.

Get Price### ASTM C39 Concrete Cylinder Compression Testing ADMET

ASTM C39 determines the compressive strength of cylindrical concrete specimens such as molded cylinders and drilled cores. It is limited to concrete having a unit .

Get Price### Experimental study of strength relationship of concrete ...

"Experimental study of strength relationship of concrete cube and concrete ... Specimens were tested at different ages 3 days, 7 days and 28 days compressive strength. The ... Experimental study of strength relationship of concrete cube and concrete cylinder using ultrafine slag Alccofine Author: Saurav, Ashok Kumar Gupta

Get Price### Compressive strength of concrete cylinders MidTech

The compressive strength of concrete cylinders. APPARATUS. Compression testing machine, cylinder mould of 150mm diameter and 300mm height, weighing balance. PROCEDURE. (i) Cast the cylinder and cure for 28 days. (ii) Takeout the specimen from the curing tank. (iii) Wipe out the excess water from the surface of specimen.

Get Price### Comparison of Compressive Strengths Using 4x8 vs. 6x12 ...

For each mix, three batches were required to make a total of 24 specimens, consisting of twelve 6 by 12in. cylinders and twelve 4 by 8in. cylinders, for determining compressive strength at 1, 3, 7 and 28 days (3 specimens per age).

Get Price### COMPRESSIVE STRENGTH OF CONCRETE CUBES

These specimens are tested by compression testing machine after 7 days curing or 28 days curing. Load should be applied gradually at the rate of 140 kg/cm2 per minute till the Specimens fails. Load at the failure divided by area of specimen gives the compressive strength of concrete.

Get Price### Compressive strength of concrete cylinders MidTech

The compressive strength of concrete cylinders. APPARATUS. Compression testing machine, cylinder mould of 150mm diameter and 300mm height, weighing balance. PROCEDURE (i) Cast the cylinder and cure for 28 days. (ii) Takeout the specimen from the curing tank. (iii) Wipe out the excess water from the surface of specimen.

Get Price