Regenerated UHPC cement concrete and preparation method thereof

A technology for cement concrete and recycled cement, applied in the field of green building materials, can solve the problems of low cement content and worrying promotion prospects, and achieve the effects of increasing particle fineness, being beneficial to environmental protection, and reducing process difficulty.

Inactive Publication Date: 2021-03-26
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the content of recycled micropowder accounts for 5%-20% of recycled construction waste, and the content of unhydrated cement is low, so the promotion prospect of recycled micropowder as a cementitious material is worrying

Method used

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  • Regenerated UHPC cement concrete and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method for recycled UHPC cement concrete, comprising the following steps:

[0027] S1, crushing, sieving and grinding the waste UHPC to obtain d 90 Regenerated UHPC micropowder S2 smaller than 75 μm, adding 1% Ca(OH) to the regenerated UHPC micropowder obtained in step S1 2 The activator is stirred and mixed evenly, so as to prepare the recycled UHPC cement.

[0028] S3. Weigh each raw material according to the following parts by weight, 300kg of recycled UHPC cement, 120kg of water, 620kg of river sand, 1030kg of gravel, and 2.0kg of high-efficiency polycarboxylate superplasticizer;

[0029] S4. Pour gravel, recycled UHPC cement, and river sand into the mixer in sequence, and stir for 30s

[0030] S5. Then mix water and high-efficiency polycarboxylate superplasticizer, pour it into a blender, stir and cure.

Embodiment 2

[0032] A preparation method containing recycled UHPC cement concrete, comprising the following steps:

[0033] S1, crushing, sieving and grinding the waste UHPC to obtain d 90 Regenerated UHPC micropowder less than 75μm.

[0034] S2, the UHPC regenerated micropowder that S1 step obtains is added the Na that quality is 2% 2 SiO 4 The activator is stirred and mixed evenly, so as to prepare the recycled UHPC cement.

[0035] S3. Weigh each raw material according to the following parts by weight, 300kg of recycled UHPC cement, 105kg of water, 580kg of recycled UHPC fine aggregate, 1000kg of gravel, and 2.0kg of high-efficiency polycarboxylate superplasticizer;

[0036] S4. Pour the recycled UHPC fine aggregate, gravel, and recycled UHPC cement into the mixer in order, and stir for 30s

[0037] S5. Then mix water and high-efficiency polycarboxylate superplasticizer, pour it into a blender, stir and cure.

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Abstract

The invention discloses regenerated UHPC cement concrete and a preparation method thereof, and belongs to the field of building materials. The concrete comprises the following components in parts by weight: 100 parts of recycled UHPC cement, 35-40 parts of water, 180-220 parts of fine aggregate, 280-350 parts of coarse aggregate and 0.5-0.8 part of a water reducing agent. The regenerated UHPC cement concrete is prepared by crushing, screening, grinding and chemically exciting and stirring waste UHPC, and the recycled UHPC cement concrete can be prepared by sequentially adding the raw materialsinto a stirrer according to the components and parts by weight of the concrete, stirring and curing. According to the preparation method, waste is changed into valuables, through the steps, the wasteultra-high performance concrete is processed into regenerated cement which can be reused, the use amount of ordinary Portland cement can be reduced, the environmental problem caused by the waste ultra-high performance concrete can be solved, and reasonable utilization of resources is achieved.

Description

technical field [0001] The invention relates to the technical field of green building materials, in particular to recycled UHPC cement concrete. Background technique [0002] Geng Ou et al. disclosed a recycled micropowder concrete and its preparation method (application number: 201310734414.2, publication date: CN103771776 A), by crushing the waste concrete into fine aggregates, and then screening the recycled micropowder with a diameter of less than 0.16mm. Use recycled micropowder to replace cement, and add activator, water, sand, and stones for stirring. The strength and carbonation resistance of recycled micro-powder concrete prepared by this method are higher than those of ordinary concrete with the same mix ratio, which can be safely applied to practical projects and improve the utilization rate of waste concrete. [0003] Liu Li et al. disclosed a recycled micro-powder concrete (application number: 202010499818.8, publication date: CN111635192 A), which included 100...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/006C04B14/48C04B14/02C04B14/06C04B2103/302
Inventor 黄靓张瀚文
Owner HUNAN UNIV
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