Regenerated concrete and production process thereof

Abstract

The invention discloses a process for collecting and production of regenerated concrete. The regenerated concrete includes, by weight, 965-1328 parts of primary aggregate, 659-1123 parts of recycled aggregate, 566-720 parts of cement; 231-322 parts of fly ash, 118-266 parts of blast furnace slag, 25-55 parts of a water reducing agent, 221-308 parts of water, and 18-45 parts of a pore space regulator. The water reducing agent consists of sodium methylene dimethyl bisnaphthalenesulfonate polymer and a beta naphthalene sulfonate-formaldehyde condensate in a weight ratio of 1:1.5-3.5. The pore space regulator includes a sustained release agent and a swelling agent, in a weight ratio of 1:0.5-0.8, which are capable of releasing carbon dioxide. Through the arrangement, the recycled aggregate reasonably replaces a part of the primary aggregate, the fly ash and the blast furnace slag are adopted for improving concrete workability, water is reduced through the water reducing agent so as to reduce pores generated after water evaporation, and most pore space can be filled or sealed with the pore space regulator, thus improving inner structure of concrete, enhancing stress strength of concreteand improving the grade of impermeability.

Description

technical field [0001] The invention relates to the technical field of building material production, in particular to recycled concrete and a production process thereof. Background technique [0002] Concrete is an important material in construction engineering. At present, concrete materials account for 70-80% of the construction materials in the world. Therefore, the annual demand for concrete and the amount of waste concrete due to replacement are considerable. Recycled concrete is the aggregate obtained by combining waste concrete buildings in a certain proportion after crushing, screening and cleaning, and then mixing the aggregate with other building materials. Recycling concrete technology can realize the recycling of waste concrete The reprocessing and reuse of recycled concrete not only enables limited resources to be reused, but also solves some environmental protection problems. Therefore, recycled concrete is a very popular production technology for building mate...

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Problems solved by technology

[0004] However, due to its own aggregate, recycled concrete has various disadvantages compared with the original aggregate. Due to the large pores inside the recycled concrete, the water absorption rate is many times that of the original concrete, which leads to later drying shrinkage and slowing down. The degree of deformation is relatively high, so more cracks are generated, which not only affects the impermeability, but also affects the strength and overall service life

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