Building cement

Abstract

The invention discloses a building cement, which comprises the following substances by mass: 500-600 parts of a cement clinker, 100-300 parts of industrial waste residue, 100-200 parts of pulverized coal ash, 100-150 parts of slag powder, 50-100 parts of river sand, 50-100 parts of fluorine gypsum, 10-20 parts of sodium chloride, 10-20 parts of titanate, 5-10 parts of sodium sulfate, 10-20 parts of alum, and 3-6 parts of sodium nitrite. According to the invention, in a preparation process of the cement, alum and sodium sulfate with antifreezing effect are added into the cement, after further mixing, the product is subjected to bagging, and during use, the cement only needs to be mixed into a concrete raw material. The building cement provided by the invention has strong anti-freezing performance, also is relatively uniform overall, and can reduce the cracking situation.

Description

technical field [0001] The present invention relates to a kind of cement for construction. Background technique [0002] The construction industry is generally constructed outdoors. In winter, when the outdoor temperature is below zero, the cement will freeze, so construction will not be possible. Usually, in order to prevent the cement concrete mixture from being damaged by freezing at low temperature, people usually adopt antifreeze methods such as adding antifreeze or steam curing, heat preservation, etc., but the latter is not suitable for large-scale application due to complicated construction and low efficiency. [0003] At present, the construction industry mainly uses cement antifreeze to be added to ordinary cement during construction. Although this method has produced certain positive effects. However, since cement antifreeze is generally only a few percent of the weight of cement, there is often uneven mixing, resulting in low antifreeze, uneven antifreeze effect...

AI Technical Summary

Problems solved by technology

[0004] (1) The drug effect is low, and the dosage is large. Generally, the dosage accounts for 3.5-15% of the cement weight, which brings a lot of inconvenience to transportation and use;

[0005] (2) The antifreeze degree is not high. The existing cement antifreeze can generally withstand about -10°C, which can only meet the winter construction needs in some areas, and there is still no guarantee for winter construction in some areas