Method for modification of rubber in crumb rubber concrete

Abstract

The invention discloses a method for modification of rubber in crumb rubber concrete. The method comprises the steps of 1, preparing acidic potassium permanganate treating fluid, wherein the mass of potassium permanganate accounts for 0.5-3% of the total mass of the treating fluid, and nitric acid accounts for 0.5-6% of the total mass of the treating fluid; 2, soaking rubber particles in the acidic potassium permanganate treating fluid for 5-50 h, and filtering, cleaning and then drying the rubber particles. After being modified by means of the acidic potassium permanganate treating fluid, the wettability of the rubber particles is improved remarkably, the contact angle is reduced to 67.1 degrees from the original 80.3 degrees, and the surface polarity of the rubber particles is improved through the action between acidic potassium permanganate and the rubber particles; the peak intensity of the surface hydroxyl group or ether group of the modified rubber particles is improved remarkably, the carbanyl group or C=C bond in rubber can be partially oxidized into hydroxyl or carboxyl by potassium permanganate, and then the polarity of rubber macromolecules is improved; bonding force and mechanical engaging force between the modified rubber particles and cement paste are higher, and compressive strength and breaking strength are high.

Description

technical field [0001] The invention relates to a rubber modification treatment method, in particular to a rubber modification treatment method in rubber aggregate concrete. Background technique [0002] Rubber aggregate concrete is a new type of composite material formed by introducing flexible components - rubber aggregates on the basis of ordinary concrete components. It is mainly used in bridge deck pavement, road pavement, structural reinforcement, sidewalks, and square engineering construction. The rubber aggregate partially replaces the sand aggregate and is mixed into the concrete, which significantly improves the performance of the concrete, mainly in the following three aspects: (1) the cracking resistance is significantly enhanced; (2) the impermeability and chloride ion erosion resistance are greatly improved; (3) The deformation ability of the matrix is ​​enhanced, which can absorb more strain energy. Therefore, its development and application has important t...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the concrete compressive strength and flexural strength are not high after rubber pretreatment in the prior art, and provide a kind of rubber modification treatment method in rubber aggregate concrete, so that after After the modified rubber is used in rubber concrete, it can obtain higher compressive strength and flexural strength

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