(1) Compressive strength
The compressive strength is the most basic performance of concrete, and the so-called concrete label is based on the compressive strength of concrete.
(1) The main factors affecting the compressive strength of concrete. When the age and temperature are constant, the strength of concrete mainly depends on the strength of cement, water-binder ratio and compactness. Mineral admixtures also have a great influence on the compressive strength of concrete.
(2) For rich concrete, the amount of cement paste is sufficient to fill the voids of the aggregate and make the concrete dense. Larger aggregates tend to form larger defects. The higher the concrete strength grade, the higher the requirements for defect control. Therefore, high-strength grade concrete usually uses coarse aggregates with smaller particle sizes. For lean concrete, the amount of grout in the concrete is insufficient. The defects in concrete mainly depend on the filling degree of the cement slurry to the aggregate voids. The increase of the maximum particle size of the aggregate helps to improve the compactness of the coagulation degree, thus improving the strength of the concrete.
