High-strength anti-crack environment-friendly concrete and preparation process thereof

Abstract

The invention provides high-strength anti-cracking environment-friendly concrete and a preparation process thereof. The recycled concrete is prepared from the following components in parts by mass: 350 to 480 parts of PC42.5 cement, 50 to 150 parts of fly ash, 450 to 600 parts of recycled lightweight aggregate, 120 to 180 parts of coated sponge iron, 5 to 20 parts of fluorocarbon modified polyacrylamide copolymer, 40 to 70 parts of sodium bicarbonate, 60 to 120 parts of polyphenyl granules, 1 to 2.5 parts of polycarboxylic acid water reducing agent and 160 to 250 parts of mixing water, wherein the recycled lightweight aggregate comprises waste ceramsite concrete blocks and waste rock wool boards, and the coated sponge iron comprises sponge iron, borax, a polyvinyl alcohol solution and rice husks; through optimization of raw material selection and matching and application of the recycled aggregate, the concrete is green and environment-friendly, prefabricated activation components are specifically arranged, the synergistic effect, high strength, crack resistance and mechanical properties are obviously improved, the performance is lasting and stable, and the method is worthy of popularization and application.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a high-strength crack-resistant environmental protection concrete and a preparation process thereof. Background technique [0002] Concrete is a building material with a wide range of sources and low prices. With the development of concrete science and technology, concrete materials are more and more widely used in various construction projects. Concrete material refers to the general designation of engineering composite materials that use cementitious materials to cement aggregates into a whole. Cement is used as cementitious material, sand and stone are used as aggregates, compound admixtures and mineral admixtures are mixed with water in a certain proportion. With stirring derived. [0003] Recycled concrete refers to the new concrete made by crushing, cleaning and grading solid construction waste blocks, mixing them with grading in a certain proportion, partially or complet...

AI Technical Summary

Problems solved by technology

[0004] However, even non-renewable cement concrete will have self-shrinkage, drying shrinkage, and temperature-drop shrinkage due to its own hydration reaction and the dehydration process of the surrounding environment. Under constraints, it is prone to shrinkage and cracking, which seriously affects the durability of concrete.

Not to mention that the recycled aggregate is subjected to a large external force during the crushing process, and a large number of fine cracks will appear inside the aggregate, resulting in low aggregate strength and high water absorption, which greatly limits the application of recycled concrete

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