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A kind of early-strength and fast-hardening type rockfill grouting recycled concrete and preparation method thereof

A recycled concrete and rockfill technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of low replacement rate of recycled aggregates, difficulty in ensuring strength, and slow strength growth rate, etc., to achieve No need to control the workability of concrete, high replacement rate of recycled aggregate, and the effect of improving strength stability

Inactive Publication Date: 2017-04-05
怀化市港翔管桩有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to provide an early-strength and fast-hardening rockfill grouting recycled concrete, which solves the problems of difficult control of workability, low replacement rate of recycled aggregate, difficulty in ensuring strength and slow strength growth rate in existing recycled concrete. question

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  • A kind of early-strength and fast-hardening type rockfill grouting recycled concrete and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Step 1, weigh 50.0% of 42.5-grade rapid-hardening sulfoaluminate cement, 2.0% of anhydrite, 0.5% of polypropylene fiber with a length of 6mm, 1.5% of polycarboxylate superplasticizer powder, and lithium carbonate according to mass percentage. 0.4%, boric acid 0.6%, graded quartz sand 45.0%, the sum of the mass percentages of the above-mentioned components is 100%, and the above-mentioned components are added to a gravity-free mixer and fully mixed to obtain a self-compacting dry powder;

[0046] Step 2, crushing and screening the waste concrete to obtain graded recycled coarse aggregate with a particle size of 5.0-31.5mm, and measuring the moisture content of the recycled coarse aggregate;

[0047] Step 3, fix the formwork according to the engineering component design drawings, pour the recycled coarse aggregate into the filling formwork, each time the filling height is not greater than 30cm, and record the weight of the recycled aggregate;

[0048] Step 4: Determine th...

Embodiment 2

[0051] Step 1, weigh 50.0% of 42.5-grade rapid-hardening sulfoaluminate cement, 2.0% of anhydrite, 0.5% of polypropylene fiber with a length of 6mm, 1.5% of polycarboxylate superplasticizer powder, and lithium carbonate according to mass percentage. 0.4%, boric acid 0.6%, graded quartz sand 45.0%, the sum of the mass percentages of the above-mentioned components is 100%, and the above-mentioned components are added to a gravity-free mixer and fully mixed to obtain a self-compacting dry powder;

[0052] Step 2, crushing and screening the waste concrete to obtain graded recycled coarse aggregate with a particle size of 5.0-31.5mm, and measuring the moisture content of the recycled coarse aggregate;

[0053] Step 3, fix the formwork according to the engineering component design drawings, pour the recycled coarse aggregate into the filling formwork, each time the filling height is not greater than 30cm, and record the weight of the recycled aggregate;

[0054] Step 4: Determine th...

Embodiment 3

[0057] Step 1, weigh 50.0% of 42.5-grade rapid-hardening sulfoaluminate cement, 2.0% of anhydrite, 0.5% of polypropylene fiber with a length of 6mm, 1.5% of polycarboxylate superplasticizer powder, and lithium carbonate according to mass percentage. 0.4%, boric acid 0.6%, graded quartz sand 45.0%, the sum of the mass percentages of the above-mentioned components is 100%, and the above-mentioned components are added to a gravity-free mixer and fully mixed to obtain a self-compacting dry powder;

[0058] Step 2, crushing and screening the waste concrete to obtain graded recycled coarse aggregate with a particle size of 5.0-31.5mm, and measuring the moisture content of the recycled coarse aggregate;

[0059] Step 3, fix the formwork according to the engineering component design drawings, pour the recycled coarse aggregate into the filling formwork, each time the filling height is not greater than 30cm, and record the weight of the recycled aggregate;

[0060] Step 4, determine th...

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Abstract

The invention discloses early strength and fast hardening type rock filling and grouting recycled concrete. The concrete comprises, by weight percentage, 49.3-50.1% of recycled aggregate, 40.9-41.6% of self-compaction dry powder and 8.3-9.8% of mixing water, wherein the weight percentage sum of the raw materials is 100%. The invention further discloses a production method of the concrete. The method includes: fixing a form board, pouring into the recycled aggregate to fill the form board, evenly pouring the self-compaction dry powder into the form board, performing auxiliary vibration while pouring, and performing the rock filling and grouting of the next layer when slurry fills the gaps of the aggregate and returns to the surface of the aggregate. The early strength and fast hardening type rock filling and grouting recycled concrete has the advantages that the workability regulating and controlling difficulty of the recycled concrete can be lowered, the utilization rate of the recycled aggregate can be increased, the strength fluctuation of the recycled concrete can be reduced, the production process can be simplified, and the strength stability of the concrete can be increased.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and in particular relates to an early-strength and fast-hardening rockfill grouting recycled concrete, and also relates to a preparation method of the recycled concrete. Background technique [0002] Recycled concrete is a kind of concrete prepared by using the recycled aggregate obtained from waste concrete crushing and processing as part or all of the aggregate. The amount of waste concrete produced by the demolition of old buildings in our country is huge every year. Therefore, the development of recycled concrete is of great significance to saving resources and protecting the environment. At present, my country's recycled concrete technology is not perfect, and recycled concrete is mostly in the experimental research stage, and its application in actual engineering is very limited. One of the main reasons for more research and less application of recycled concrete technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B18/16
CPCY02W30/91
Inventor 桑国臣崔立董小根朱轶韵赵钦张浩博
Owner 怀化市港翔管桩有限公司
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