A special light-burned magnesia dam concrete preparation technology and construction method for external water admixture with adjustable expansion process

Abstract

The present invention discloses a preparation process of special external-adding hydraulic light burning magnesium oxide dam concrete having an adjustable expanding process, wherein the adding amount, the fineness compostion, the active index, the calcining temperature and the calcining thermal insulation time of the special hydraulic light burning magnesium oxide expanding agent are adjusted so as to adjust and control the expanding-age process of the external-adding hydraulic light burning magnesium oxide dam concrete. The invention further discloses a construction method of the special external-adding hydraulic light burning magnesium oxide dam concrete having the adjustable expanding process. According to the present invention, the expanding process of the special external-adding hydraulic light burning magnesium oxide dam concrete can be adjusted, such that the expanding amount can be compensated according to the requirement of the dam concrete so as to achieve the accurate control, significantly improve the quality of the project, reduce the temperature control measures, save the temperature control cost, save the investment, and improve the benefits of the project.

Description

technical field [0001] The invention relates to a preparation process and construction method of special light-burned magnesium oxide dam concrete with externally mixed water engineering with adjustable expansion process. Background technique [0002] During the construction of concrete dams, due to the heat of hydration of cement, the temperature rises. After reaching the highest temperature inside the concrete, it will gradually decrease, resulting in volume shrinkage. The dam concrete is restricted and cannot shrink freely, resulting in tensile stress inside. The concrete will crack due to temperature stress, seriously threatening the safe operation and benefit of the dam. Therefore, the dam concrete needs to be divided into joints and blocks, and constructed in thin layers to reduce the accumulation of heat of hydration. Sometimes it is necessary to take temperature control measures such as adding ice and mixing, air-cooled aggregates, and groundwater to control the temp...

AI Technical Summary

Problems solved by technology

[0003] The use of external magnesia concrete can compensate the cold shrinkage of concrete by using its delayed expansion characteristics, but the existing external magnesia concrete does not deliberately control and adjust the particle size composition of magnesia expansion agent, calcination temperature, calcination heat preservation time and other factors. - The age process line is solely determined by the dosage, which cannot be adjusted or controlled, and can only achieve partial compensation, not full compensation, and the benefits and effects cannot be fully exerted