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Anti-cracking alkali slag recycled concrete and preparation method thereof

A technology of recycled concrete and alkali slag, which is applied in the field of building materials, can solve the problems of poor construction workability, easy integration, and high cost, and achieve the effects of improving workability, crack resistance, and strength

Inactive Publication Date: 2021-04-06
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, steel fiber and polypropylene fiber have high material costs, poor construction workability, easy to unite, and problems such as rust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027]The anti-crack alkali slag regeneration concrete and its preparation method include the following steps:

[0028](1) Metering each component according to the above ratio;

[0029](2) Pour the saturated downtown regeneration, natural aggregate, sand, slag, magnesium oxide and cement into the mixer mixed for 1 minute, ie mixed dry material;

[0030](3) Sodium sulfate, sodium silicate, and PTB emulsion were dissolved in water, stirred for 2 to 3 minutes to form a mixed solution; then pour the mixed solution into the mixed dry material for 2 to 3 minutes, then pouring molded;

[0031](4) Stay for 1 day, the mold is rearmed, and then the temperature is 20 ± 2 ° C, the relative humidity is 95% standard maintenance room for 28 days.

Embodiment 1

[0033]A anti-crack-based alkali slag regenerated concrete mainly consists of sodium sulfate, sodium silicate, cement, slag, magnesium oxide, regenerated coarse aggregate, natural coarse aggregate, sand, PTB emulsion, and water, each component mass is: NA2SO4 1.5%, NA2SiO30.3%, cement 1.0%, slag, 0.4% MgO, regenerated coarse aggregate, 22.6% natural crude bone, 23.7% sand 23.%, PTB emulsion 2.1% and water 8.9%, each component mass percentage 100%.

[0034]The method of preparing the anti-crack-based alkali slag regenerated concrete in this embodiment includes the following steps:

[0035](1) Metering each component according to the above ratio;

[0036](2) Pour the saturated downtown regeneration, natural crude bone, sand, slag, magnesium oxide and cement into the mixer mixed for 1 minute, ie mixed dry material;

[0037](3) Sodium sulfate, sodium silicate, and PTB emulsion were dissolved in water, stirred for 2 minutes, forming a mixed solution; then poured into mixed dry material for 2 minutes,...

Embodiment 2

[0041]A anti-crack-based alkali slag regenerated concrete mainly consists of sodium sulfate, sodium silicate, cement, slag, magnesium oxide, regenerated coarse aggregate, natural coarse aggregate, sand, PTB emulsion, and water, each component mass is: NA2SO4 1%, NA2SiO3 0.2%, cement 0.7%, slag 11.9%, MgO, regenerated coarse aggregate 25.5%, natural coarse bone material 25.5%, sand 26.8%, PTB emulsion 1.6% and water 6.5%, each component mass percentage and 100 %.

[0042]This example anti-crack-based alkali slag regeneration concrete preparation method is in Example 1.

[0043]This example anti-crack-based alkali slag regeneration concrete test method is in Example 1. The collapsed concrete collapse of the prepared alkali slag regenerated concrete was 110 mm, 28 D compressive strength and splitting strength of 36 MPa and 2.8 MPa, respectively, and the crack index was 73%.

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Abstract

The invention discloses anti-cracking alkali slag recycled concrete and a preparation method thereof. According to the invention, sodium sulfate, sodium silicate and cement are used as composite excitants, such that advantages of cracking resistance, good strength, and the like are provided. The recycled coarse aggregate with the saturated surface dry can return water to achieve an internal curing effect, so that the shrinkage of the material is reduced, and the anti-cracking performance is improved; magnesium oxide is adopted to compensate shrinkage of the alkali slag concrete, and cracking is further reduced; by adopting the PTB emulsion, the development of micro-cracks in the material can be inhibited, and the waterproof performance and the workability are relatively good; and the used slag and recycled aggregate are wastes which are recycled, so that garbage landfill can be reduced, and environmental management and protection are facilitated. The anti-cracking alkali slag recycled concrete has good economic, social and environment-friendly benefits and is suitable for large-scale popularization and application.

Description

Technical field[0001]The present invention belongs to the field of building materials, and more particularly to anti-crack-based alkali slag regeneration concrete and preparation method thereof.Background technique[0002]Concrete has become the most widely indispensable building materials, but their resource and environmental problems are also increasingly prominent, especially the main raw material cement of concrete, which will bring extremely serious environmental pollution during production. Therefore, the new type of gelling material for "green environmental protection" is studied to replace ordinary silicate cement, which is a work that is inadvertent and actual engineering application. Alkali slag regeneration concrete (from slag, excitation, regenerated aggregate, natural gravel aggregate) as an alternative material of ordinary concrete, high strength, hardening, durability, etc., has caused relevant scholars and industries Wide attention. In addition, compared with ordinary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/27
CPCC04B28/04C04B2111/27C04B2111/343C04B2201/50C04B18/167C04B12/04C04B14/06C04B18/141C04B14/304C04B22/147C04B24/2688
Inventor 郑小燕季韬张彬彬游生洁
Owner FUJIAN AGRI & FORESTRY UNIV
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