Full-recycled aggregate concrete and preparation method thereof

Abstract

The invention provides a fully recycled aggregate concrete, which is prepared from the following components in parts by weight: 200 to 350 parts of cement, 80 to 100 parts of coal ash, 40 to 100 parts of slag powder, 800 to 1000 parts of recycled fine aggregate, 200 to 400 parts of recycled coarse aggregate 1, 500 to 600 parts of recycled coarse aggregate 2 and 30 to 50 parts of concrete admixture, the ratio of the recycled fine aggregate property to the recycled coarse aggregate property 1 to the recycled coarse aggregate property 2 is 1: (0.80-1.0), the ratio of the recycled coarse aggregate property 1 to the recycled coarse aggregate property 2 is 1: (1.5-2.1), the fineness modulus of the recycled fine aggregate is 2.3-3.0, the particle size of the recycled fine aggregate 1 is 5mm-10mm, the particle size of the recycled coarse aggregate property 2 is 10mm-25mm, the admixture is a polycarboxylate superplasticizer, the water-reducing rate of the admixture is not less than 27%, and the water-reducing rate of the admixture is not less than 27%. The working performance and the durability of the concrete are favorably improved.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a kind of fully recycled aggregate concrete and a preparation method. Background technique [0002] With the rapid development of my country's economy and the vigorous development of urbanization, the original natural ecological system has been greatly impacted and destroyed. It is necessary to fully promote the implementation strategies of "comprehensive conservation and recycling of resources and strengthening solid waste and garbage disposal". [0003] With the acceleration of industrialization and urbanization, and the rapid development of the construction industry, these have brought us an efficient and convenient way of life, but also produced certain negative effects. For example, the generation of a large amount of construction waste not only occupies valuable cultivated land resources, but also brings serious pollution to our production and living environment, directly...

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Problems solved by technology

[0008] 2. Research on the replacement rate of recycled aggregates from construction waste. In the existing research, considering the impact of recycled aggregates on the performance of concrete, the implementation cases at this stage are relatively complicated, including partial replacement, full replacement, single replacement and Composite substitution, etc. JGJ / T240-2011 "Technical Regulations for the Application of Recycled Aggregate" expounds the replacement rate of recycled aggregates, and imposes certain restrictions on the application scenarios of types I, II, and III recycled aggregates

The mixing weight ratio of cement, construction waste coarse aggregate and construction waste fine aggregate is 1:(3~5):(1.5~3). Although sodium hydroxymethyl cellulose is added to this concrete, its strength is still relatively high. Low, poor work performance and durability

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