The main measures to improve the concrete strength are as follows:
1. Improving the density of concrete, controlling the water cement ratio and ensuring enough cement dosage are the keys to ensure the compactness of concrete and improve the durability of concrete. In a certain range, the smaller the water cement ratio is, the higher the concrete strength is. On the contrary, the larger the water cement ratio is, the more water is used, and the more pores are left by the evaporation of excess water, thus reducing the strength.
2. To improve the grain gradation of coarse and fine aggregate, the grain gradation of sand refers to the situation that the sand particles with different particle sizes match each other. The well graded sand has a small void ratio, which can not only save cement, but also improve the workability of concrete mixture, and improve the compactness, strength and durability of concrete.
3. Reasonable selection of cement varieties, but there are many types of cement, so the selection of cement must be careful, Once the cement stone is damaged, the durability of concrete will be destroyed. Therefore, the selection of cement should pay attention to the specific performance of cement varieties, select the cement with small alkali content, low hydration heat, small dry shrinkage, heat resistance, water resistance, corrosion resistance and frost resistance, and select them according to the specific conditions.
The main factors affecting the compressive strength of concrete are cement strength and water cement ratio. In order to control the quality of concrete, the most important thing is to control the quality of cement and the water cement ratio of concrete. In addition, there are other factors that can not be ignored, such as the type of concrete fiber, steel fiber, synthetic fiber or natural fiber.
