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Study on the Pavement Property of Recycled Tire Rubber Powder Modified Cement Concrete

Author: GuoCanXian
Tutor: HuangShaoWen
School: Nanchang University
Course: Materials Science
Keywords: Waste Rubber Cement mortar Concrete Mechanical properties Surface Modification Interface
CLC: U414
Type: Master's thesis
Year: 2006
Downloads: 495
Quote: 15
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Abstract


With the auto industry, scrap tires generated rapid growth, has become a new source of environmental pollution. Waste Rubber cement concrete utilization of waste resources recycling project is a new topic. It's clean use of used car tires, saving resources and improving the performance of concrete has important significance. This paper studies the tire rubber powder as fine aggregate were partially replace cement sand mortar and cement concrete physical and mechanical properties. In order to improve the cement powder and colloidal compatibility studies powder surface modification techniques and methods; crumb rubber modified to improve the overall performance of cement-based materials studied superplasticizer and doped polymer emulsion adhesive Performance Optimization powder concrete action; Furthermore, the use of scanning electron microscopy (SEM) analysis of the mixed powder cement paste microstructure, fracture surface and hydration products, and analyzes the rubber modified cement concrete macro-fracture surface and pore structure. The results show that the incorporation of powder can significantly improve the impact toughness of concrete, the delay damaged by force, lower modulus of elasticity; modified powder for cement concrete crack resistance, impact resistance and have a more significant role in optimization. Powder incorporation will significantly reduce the density of concrete, concrete mixture reduced mobility; With powder dosage increases, the concrete strength is reduced, especially compressive strength decreased significantly; through mixing polycarboxylate Salt superplasticizer and modified for powder processing and other measures, can significantly reduce the strength of concrete powder on the negative effects. Adhesive strength of cement mortar and cement concrete similar trend, with the powder dosage increases, especially the strength of cement mortar compressive strength decreased significantly, while setting time is prolonged. Rubber powder mixed with the wear resistance of the cement mortar will produce significant adverse effects, but the modified powder to adversely affect the wear resistance of the cement mortar, a significant slowdown. Influence of polymer emulsion showed that with the increase in dosage of polymer emulsion, cement mortar 3 days compressive strength decreases, but the 28 days compressive strength. Powder surface modification method and the material properties of studies show that organic modifier B modified cement mortar powder prepared by modification has the best effect; inorganic modifying agent A due to low prices, thereby more promotional value; coupling C is the most simple modification process; three kinds of methods crumb rubber modified cement mortar 28d compressive strength were significantly improved effect. Orthogonal experiment on the use of orthogonal pairs of rubber powder fineness, dosage, dosage and polymer modification method for optimization of multi-factor level test, the results showed that: the best rubber powder content is 10%, A modification method using the modification method, the effect is greater than 60 mesh rubber powder preferably, the polymer content is 25% of the optimum.

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