Anti-chlorine salt erosion mortar prepared from waste truck brake shoe friction material and preparation method

Abstract

The invention discloses anti-chlorine salt erosion mortar prepared from waste truck brake shoe friction materials, and relates to the technical field of building materials. The anti-chlorine salt erosion mortar comprises the following raw materials: water, cement and aggregates, wherein the weight ratio of the water to the cement to the aggregates is 0.37 to 1.0 to 0.98; the aggregates comprise 5%-15% by weight of the waste truck brake shoe friction materials obtained by an anaerobic thermal cracking method, and sand. The invention further discloses a preparation method of the anti-chlorine salt erosion mortar; the preparation method comprises the following steps: firstly, pouring the waste truck brake shoe friction materials and the sand into a mortar stirrer and uniformly stirring for 3 minutes; secondly, pouring the cement into the stirrer, and uniformly stirring for 3 minutes; finally, slowly adding the water into the stirrer, slowly stirring for 1 minutes at first and then quickly stirring for 2 minutes to obtain the anti-chlorine salt erosion mortar. By adding the waste truck brake shoe friction materials into the aggregates, the pore structure of the mortar is optimized, the strength and chlorine salt erosion resistance of the mortar are improved, and the service life of the structural cement is prolonged.

Description

technical field [0001] The invention relates to the technical field of building materials. Background technique [0002] Chloride attack, sulfate attack carbonization and freeze-thaw damage are the main factors leading to the deterioration of reinforced concrete structures. Chloride ions reach the concrete-reinforcement interface through the concrete protective layer and gradually accumulate, forming a primary battery under moderate conditions, causing corrosion of the rebar, corrosion of the rebar, expansion of the rebar, reduction of the cross-sectional area of ​​the rebar, and a decrease in the bond between the rebar and the concrete. Typical deterioration of reinforced concrete mainly includes cracking of mortar and concrete, spalling and steel corrosion. In marine structural concrete, the erosion of steel bars due to chloride ions is typical. At present, methods of reducing water-binder ratio, adding air-entraining agents and adding mineral admixtures, such as fly ash,...

AI Technical Summary

Problems solved by technology

[0003] At present, the brake shoes (brake pads) for vehicles are calculated on the basis of 700,000 railway freight cars (8 brake shoes per car), and the number of discarded brake shoes to be replaced every year is about 4 million, with a weight of 5,000 tons. If road traffic is considered The brake pads used in vehicles, agricultural vehicles, industrial and mining machinery, etc. have a huge amount of waste, and if they are not handled properly, they will cause environmental pollution

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