Using self-leveling cement mortar, we can make a solid flat surface economically in accordance with the requirements, which is widely recognized and applied. Because of the demands of self-leveling, the mortar required materials have good liquidity and flow retention. Therefore, the raw materials must have a supporting role. Analyzing the raw materials, the paper study the effects of raw materials for the self-leveling cement mortar.
Additives on low temperature compaction and performances of compacted mixtures, the author devised low temperature environment compaction test, and then, comparison tests of volume parameters, high temperature stability, low temperature crack resistance and water sensitivity were conducted. Tests results showed that the wax additives and the surface-active additive can significantly contribute to mixtures low-temperature compactibility. The wax additive helps to improve high temperature stability obviously, and has no significant contribution to low temperature crack resistance and water sensitivity. The surface-active additive directly reduces water sensitivity, the wax additive indirectly plays the role of reducing water sensitivity by increasing the density of mixture, and the foam additive has no obvious effect on the water sensitivity.
Based on the evaluation of fibrous concrete materials and the experiments of freezing-thawing resistance home and abroad, the present experiment takes relative dynamic modulus of elasticity and rate of mass reduction as an analytical index to conduct a comparative study on the effects of the mixing of four kinds of polypropylene fiber on the cement concrete freezing resistance. The results show that different kinds of polypropylene fiber have different influences on cement concrete freezing resistance. And some polypropylene can improve it while others may make it decreased.
The construction industry is a pillar industry of Chinese national economy, but also one of the industries with high accident rates. This paper analyzed Chinese construction industry in recent years, production safety situation, which indicated that the building production safety accidents and deaths continued to decline, construction safety production and the overall situation was getting better and better. After management analysis of safety production in construction industry, strengthening the government functions, truly serving people oriented from government to business, and enhancing the safety culture were real solutions of construction management.
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