A preparation method of low-alkali silicic acid reaction expansion high-volume waste crushed glass self-compacting concrete

Abstract

The invention relates to a low-alkali silicic acid reaction expanded high-doping amount waste pulverized glass self-compacting concrete preparation method. According to the invention, a natural chitinhigh polymer is subjected to degradation, deacylation, carboxylation, and intramolecular dehydration, and is modified to a low molecular weight polylactic acid base silicic acid reaction inhibitor; awaste pulverized glass fine aggregate covered by the polylactic acid base silicic acid reaction inhibitor is used to replace s river sand fine aggregate into the self-compacting concrete, and the low-alkali silicic acid reaction expanded high-doping amount waste pulverized glass self-compacting concrete is prepared. the addition of polylactic acid effectively inhibits the alkali silicic acid reaction in the high-doping amount waste pulverized glass self-compacting concrete. The high-doping amount waste pulverized glass self-compacting concrete has better working performance and durability performance and good volume stability than that of the traditional self-compacting concrete, which expands the application range of waste glass and can produce good technical, economic, social and environmental benefits.

Description

technical field [0001] The invention relates to the field of new building materials, in particular to a method for preparing self-compacting concrete with low alkali silicic acid reaction expansion and high content waste crushed glass. Background technique [0002] Since the beginning of the 21st century, with the acceleration of urbanization and infrastructure construction worldwide, high-performance concrete is the most widely used building material, and its consumption and use are increasing. Self-compacting concrete is an important part of high-performance concrete materials. Because of its strong fluidity, good filling performance, stability and non-segregation, it can reach a fully compacted state without vibration and only relies on its own gravity. The construction process is simple and easy to operate. The pouring speed is fast, the labor is saved, and the construction period can be shortened. It has been widely used in large-volume structural concrete and complex-...

AI Technical Summary

Problems solved by technology

[0005] In view of the current problems such as low consumption of waste crushed glass in self-compacting concrete of waste crushed glass, large expansion of alkali silicic acid reaction, and poor volume stability, some researchers at home and abroad have tried to add lithium salts to self-compacting concrete of waste crushed glass to inhibit Long-term alkali silicic acid reaction expansion, but the addition of lithium salt alkali silicic acid reaction inhibitor will significantly increase the production cost of waste crushed glass self-compacting concrete

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