Recycled concrete with high slump loss resistance and preparation method thereof

Abstract

The invention discloses recycled concrete with high slump loss resistance and a preparation method thereof. The invention belongs to the field of building materials, the key points of the technical scheme comprise that the raw materials comprise 180-220 parts by weight of cement, 380-490 parts of a modified recycled coarse aggregate, 400-500 parts of gravels, 680-820 parts of natural sand, 90-130parts of fly ash, 65-98 parts of mineral powder, 156-185 parts of water, 4.2-5.8 parts of a polycarboxylate superplasticizer and 3.5-6.4 parts of a slump retaining enhancer. A treatment method of themodified recycled coarse aggregate comprises the steps: a crushed coarse aggregate is placed in a sodium silicate solution with the concentration of 3%-7% to be soaked for 4 h-9 h, then the recycled coarse aggregate is added into a mixed solution of a polyvinyl alcohol solution with the concentration of 8%-12% and a silane emulsion with the concentration of 4%-10% to be continuously soaked for 8 h-12 h, and the effect of improving the slump loss resistance of the recycled concrete is achieved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a recycled concrete with high slump retention and a preparation method thereof. Background technique [0002] Waste concrete contains a large amount of sand and gravel aggregates. If they are recycled, it can not only reduce costs, save natural resources, alleviate the contradiction between supply and demand of aggregates, but also reduce the pollution of waste concrete to the environment. [0003] Recycled aggregate is the aggregate obtained by crushing, cleaning, grading and coordinating waste concrete in a certain proportion, and the concrete prepared by using recycled aggregate as part or all of the aggregate is called recycled aggregate concrete. The Concrete Technology Section realizes the reprocessing of waste concrete to restore its original performance and form new building material products. At present, an important indicator to measure the performance of fresh concre...

AI Technical Summary

Problems solved by technology

Commercial concrete needs a period of transportation and storage time from mixing to pouring, which easily deteriorates the workability of concrete, that is, the loss of slump, and the recycled coarse aggregate is rough due to its rough surface, high porosity, and high water absorption. Compared with ordinary concrete, the workability of recycled concrete is relatively poor, the loss of slump, and the reduction of workability are more significant, which directly affects the practical application of recycled concrete.

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