Method for designing mix proportion of high-grade concrete in high-altitude area

Abstract

The invention relates to the technical field of building materials, in particular to a method for designing the mix proportion of high-grade concrete in a high-altitude area. The method mainly comprises the steps of obtaining initial ingredients of cement, a mineral aggregate admixture, water, coarse aggregate, fine aggregate and an additive; proportioning the ingredients in the step 1 according to the standard of high-grade concrete, and mixing and stirring to obtain mortar, wherein the proportion of the mineral aggregate admixture is K, the proportion of the additive is P, the mortar is poured into a cement pier with the size of 10 cm * 10 cm * 10 cm in a conventional area, the internal temperature, the external temperature and the void ratio of the cement pier are measured, after the cement pier is dried and formed, the water content SC and the mass MC of the cement pier are measured, the density rho C of the cement pier is obtained, and the strength threshold value FC and the toughness threshold value sigma C of the cement pier are measured; and proportioning the ingredients again, mixing and stirring to obtain the mortar. According to the invention, the speed of designing the mix proportion of the concrete in the high-altitude area is effectively increased, and meanwhile, the designed concrete is suitable for the high-altitude area and also has the self strength.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for designing the mix ratio of high-grade concrete in high-altitude areas. Background technique [0002] Affected by altitude and geographical location, the alpine and high-altitude areas have environmental characteristics such as low air pressure, low relative humidity, low temperature, large temperature difference between day and night, strong sunlight radiation and long sunshine hours. Such harsh environmental conditions make the workability of concrete , strength and durability are reduced. [0003] At present, in order to ensure the strength and durability of concrete in high-cold and high-altitude areas, improvements are generally made from two aspects. On the one hand, improvements can be made in the design of the mix ratio by reducing the water-binder ratio and adding admixtures. On the other hand, improve the construction measures: such as heating t...

AI Technical Summary

Problems solved by technology

[0004] At present, the purpose and measures for improving the concrete mix ratio are often relatively single, which cannot take into account its various properties, and changing the mix ratio depends on the quality of each material to mix the efficiency is too poor, so how to provide concrete without changing the performance of concrete? A design method of high-grade concrete mix ratio in high-altitude areas has become an urgent problem to be solved in engineering