What Is The Standard Compressive Strength Of Concrete?
The compressive strength of concrete ranges from 15 MPa (2200 psi) to 30 MPa (4400 psi) for residential concrete and is high in commercial structures. Some applications use forces greater than 10,000 psi (70 MPa).
THINGS AFFECTING COMPRESSIVE STRENGTH
OF CONCRETE
COARSE
AGGREGATE
On the whole, concrete is made homogeneous by the mixture of
aggregates, cement, sand, water and various admixtures. Even though the right the mix of concrete has some microcracks due to the thermal and mechanical
properties of the coarse aggregates and differences in the cement matrix, which
can lead to concrete failure.
Technologists of Concrete have proposed theoretical
concepts regarding aggregate size, which as the size of aggregate is the
primary factor of compressive strength. So if the number of aggregate
increases, it will increase the compressive strength.
This theory was later rejected because experiments showed
concrete strength increased in the early stages of aggregates, but it's reduced
exponentially.
The only reason for the decline in this strength is the
reduction of the bond strength between the cement matrix and the aggregates and
weak transition area.
AIR-ENTRAINMENT
Air entrainment into concrete is one of the ideas
developed by cold countries to prevent damage caused by freezing and thawing.
Later experiments demonstrated the benefits of air entrainment, improving the
performance of concrete at low water/cement ratios.
Achieving the desired workability at low water content
helped to obtain concrete with high compressive strength, which leads to
lightweight concrete with high compressive strength.
WATER/CEMENT RATIO
We are all well aware of how much excess water can affect
the strength of concrete. Since the cement is the main binder in concrete, water is
required for the hydration process, but this is only about (0.20 to 0.25)% of
the cement content. Excess water contributes to the performance and benefits of
concrete finishing.
Once the water in the concrete matrix dries, it is
considered that the excess water can cause damage because it leaves large
spaces between the aggregate and the cement grains. This interstitial space
becomes the main cracks during the concrete compressive strength test.
FACTORS AFFECTING COMPRESSIVE STRENGTH
OF CONCRETE
1.
Water Cement Ratio
2.
cement Quality
3.
storage of Cement
4.
Quality of Aggregate
5.
Quality of Water
6.
Slump
7.
Moisture in
aggregate
8.
Degree of compaction
9.
Curing efficiency
10.
Curing temperature
11.
Temperature at the
time of moulding cubes
12.
loading direction
13.
Moisture content during
cube tests
14.
loading duration
15.
Compression machine
and operation factors
16.
Degree of lateral
restraint
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