Regenerated concrete production technology

A technology of recycled concrete and manufacturing process, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the high degree of dry shrinkage and creep, affect impermeability, affect strength and overall use Life and other issues, to achieve the effect of enhancing mechanical properties, prolonging service life, and reducing the development of cracks

Inactive Publication Date: 2018-12-11
武汉华强新型建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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Examples

Experimental program
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Effect test

Embodiment 1-5

[0041]Examples 1-5, a recycled concrete, include components and corresponding contents as shown in Table 1. Among them, the cement is ordinary Portland cement with a strength grade of 32.5; the particle size of refined coarse aggregate is 5-20mm, and the particle size of refined fine aggregate is 1.5-4mm; Composed of sodium methyldimethyl dinaphthalene sulfonate polymer and β-base naphthalene sulfonate formaldehyde condensate; the gap regulator includes a slow-release agent and an expansion agent with a weight ratio of 1:0.5, and the slow-release agent is treated by carbon dioxide immersion Perfused aluminosilicate, the expansion agent is composed of calcium oxide, calcium sulfoaluminate and magnesium oxide in a weight ratio of 3:1:1.

[0042] Each component and its corresponding content table (kg) in the embodiment 1-5 of table 1

[0043]

Embodiment 6

[0044] Embodiment 6, a recycled concrete, differs from Embodiment 1 in that it does not contain poor saponin.

Embodiment 7

[0045] Embodiment 7, a production process of recycled concrete, the components contained and the corresponding content refer to Example 1, and the steps included are as follows:

[0046] S1, prepare recycled aggregates, crush waste concrete blocks, remove steel bars and sieve to obtain recycled aggregates, and then undergo magnetic separation to remove metal impurities and rust, winnowing and removing impurities to reduce leaves and plants, and water washing and dust removal. Remove the soil to obtain qualified recycled aggregate. At this time, perform a screening to obtain recycled coarse aggregate and recycled fine aggregate, and the particle size of the recycled coarse aggregate is 5-40mm, and the particle size of the recycled fine aggregate is less than 5mm;

[0047] S2, recycled aggregate pretreatment, heating the recycled coarse aggregate and recycled fine aggregate obtained in S1 to 300°C, crushing again, and performing secondary screening after crushing to obtain refine...

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Abstract

The invention discloses a regenerated concrete production technology. The regenerated concrete production technology comprises the following steps: crushing waste concrete, carrying out primary sieving and washing to obtain regenerated coarse aggregate and regenerated fine aggregate; heating the regenerated coarse aggregate and the regenerated fine aggregate to 300 to 400 DEG C; crushing again; carrying out secondary sieving after crushing, so as to obtain refined coarse aggregate and regenerated fine aggregate; putting the refined coarse aggregate and the regenerated fine aggregate into a sealed container and carbonizing; controlling the relative humidity to be 40 to 85 percent and the CO2 concentration to be 30 to 75 percent until the weight of non-carbonized regenerated aggregate is less than or equal to 5 percent; S4, preparing regenerated concrete; stirring and mixing the regenerated aggregate treated by S3 with raw aggregate, an adhering material, filler and an additive, so as toobtain a finished product. With the adoption of the regenerated concrete production technology, waste concrete is subjected to multi-level treatment to obtain relatively qualified regenerated aggregate, and mechanical properties are also greatly improved; meanwhile, the effect of slowly releasing carbon dioxide is realized after the concrete is carbonized, drying shrinkage and creep in the laterperiod can be relieved and the stress and anti-permeability capability of the regenerated aggregate are improved and the service life of the regenerated aggregate is prolonged.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/02C04B18/16
CPCC04B20/023C04B28/04C04B2201/50C04B18/16C04B18/08C04B18/141C04B24/226C04B24/22C04B22/00C04B24/10C04B22/064C04B22/142C04B22/066Y02W30/91
Inventor 刘汉华李松杜良凯张文杰
Owner 武汉华强新型建筑材料有限公司
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