Abstract
Waste concrete in the construction waste is reprocessed into concrete sand and powder [1]. Recycled concrete sand with a particle size between 0.15 and 0.25mm partially replaces natural sand, and the recycled concrete powder with a particle size less than 0.075mm partially replaces cement. The five-factor four-level orthogonal experiment was used to study the replacement amount of recycled concrete powder, the replacement amount of recycled concrete sand, the amount of dispersible latex powder, the amount of polycarboxylate water-reducing agent, the ratio of bone cement, and the five factors on the fluidity of self-leveling mortar. The influence of the three performance indicators of bond tensile strength and dimensional change rate; through the range analysis of the above indicators. The analysis results show that the content of recycled concrete powder instead of cement has the greatest impact on the tensile bond strength and dimensional change rate of recycled concrete powder self-leveling mortar, and the content of Polycarboxylate Superplasticizer has the greatest influence on the fluidity.
Highlights
Construction waste refers to the solid waste generated during the construction and demolition of buildings, mainly solid waste generated during the demolition of buildings, including mortar, concrete, metal, concrete blocks, blocks and other buildings generated during the demolition of buildings Rubbish
The analysis results show that the content of recycled concrete powder instead of cement has the greatest impact on the tensile bond strength and dimensional change rate of recycled concrete powder self-leveling mortar, and the content of Polycarboxylate Superplasticizer has the greatest influence on fluidity
According to the range analysis, the biggest factor that affects self-leveling mortar of recycled concrete is the content of concrete powder instead of cement, followed by the degree of influence of Polycarboxylate Superplasticizer
Summary
Construction waste refers to the solid waste generated during the construction and demolition of buildings (structures), mainly solid waste generated during the demolition of buildings, including mortar, concrete, metal, concrete blocks, blocks and other buildings generated during the demolition of buildings Rubbish. How to use construction waste scientifically so that it can be a green renewable material has become a research focus [2,3]. By exploring the recycling of recycled concrete into aggregate, it can effectively reduce construction waste and energy consumption. Green building materials such as recycled concrete powder formed after crushing, grinding, and screening of waste concrete make concrete a renewable energy source [4,5]. On the basis of retaining its original fluidity, rapid hardening, durability and abrasion resistance, it fully uses the substitution of waste concrete powder and effectively improves the resource utilization of construction waste rate
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