Comparative Analysis of Strength of Concrete Made by Various Aggregate

Types of soil A number of classification systems have evolved for categorizing various types of soil. Terminologies of different soil types are discussed here along with classification systems.

Temping of cube with the help of temping rod..

Foundation Erosion ...

WHY WE TEST CONCRETE SRTRENGTH AFTER 28 DAYS?
The table below shows the compressive strength gained by concrete after 1, 3, 7, 14 and 28 days with respect to the grade of concrete we use.
Age Strength per cent
1 day 16%
3 days 40%
7 days 65%
14 days 90%
28 days 99%
From above table, we see that, concrete gains 16 percent strength in one day, 40 percent in 3 days, 65% in 7 days, 90% in 14 days and 99% strength in 28 days. Thus, it is clear that concrete gains its strength rapidly in the initial days after casting, i.e. 90% in only 14 days. When, its strength have reached 99% in 28 days, still concrete continues to gain strength after that period, but that rate of gain in compressive strength is very less compared to that in 28 days.
After 14 days of casting concrete, concrete gains only 9% in next 14 days. So, rate of gain of strength decreases. We have no clear idea upto when the concrete gains the strength, 1 year or 2 year, but it is assumed that concrete may gain its final strength after 1 year. So, since the concrete strength is 99% at 28 days, its almost close to its final strength, thus we rely upon the results of compressive strength test after 28 days and use this strength as the base for our design and evaluation.
Though there are also some rapid method of testing concrete compressive strength which gives relation between rapid test methods and 28 day strength. This rapid test is done where time is limited for construction and strength of structural member must be known to carry out further construction work.

Con- crete compressive strength requirements can vary from 2500 psi(17 MPa) for residential concrete to 4000 psi (28 MPa) and higher in commercial structures. Higher strengths up to and exceeding 10,000 psi(70 MPa) are specified for certain applications.

MATERIALS & METHODOLOGY
MATERIALS

PROPERTIES OF MATERIALS
Properties of Cement

Blocks During .. Of 12.75mm Aggregate were for the preparation purpose of these blocks..

Foundry Sand..

Picture during testing when the block should not break completely..