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Hardened Concrete

Testing and interpretation

Correlation with properties of fresh concrete

Special Binders

Natural Aggregates

Fiber Reinforcement

The compressive strength of regular concrete at elevated temperatures up to 700°C and its effect of cooling were compared.

It was found that the strength loss was more significant on the tests rapidly cooled in water

The hardened concrete strength can vary depending on the temperature and water to cement ratio. It can goes from 100 to 250 kg/cm2

It was investigated that the rheological properties of fresh concrete can be correlated to the mechanical and permeation properties of the hardened concrete.

Concrete can crack during hardening especially if shrinkage is restrained. It can reduce durability and increase its leakage.

The effect of water to binder ratios, compressive strenght, modulus of elasticity and tensile strength of concrete with special binders were investigated

Test results show that the mechanical properties of based concrete were significantly influenced by the water–binder ratio and to less extend by fine to total aggregate ratio

The use of natural aggregates such as limestone in the construction industry has been increasing over time due to its bennefits as an aggregate.

Some benefits of natural aggregates for concrete include good strength, low cost, and low possibility of bad reactions with cement

Several studies analyzes the impact of polypropylene fibers on mechanical properties of hardened concrete

Applying these fibers at their maximum percentage volume increased the tensile splitting and flexural strengths by 14.4% and 10.7%, respectively.