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Early-strength sprayed concrete

A sprayed concrete, early-strength type technology, applied in the field of shotcrete, can solve the problems of operators' physical and environmental adverse effects, strong alkalinity, etc., and achieve the effects of low rebound rate, increased viscosity, and reduced rebound rate

Inactive Publication Date: 2016-04-20
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quick-setting agent of this patent belongs to the type of aluminum-oxygen clinker accelerator, which has a strong alkalinity, which will shrink the strength of concrete in the later stage, and has adverse effects on the operator's body and the environment.

Method used

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  • Early-strength sprayed concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0020] An early-strength shotcrete comprises the following raw materials in parts by weight: 400 parts of sulphoaluminate cement; 50 parts of silica fume; 800 parts of medium sand; 1000 parts of gravel; 0.03 parts of lithium carbonate; 180 parts of water.

Embodiment 2

[0022] An early-strength shotcrete comprises the following raw materials in parts by weight: 410 parts of sulphoaluminate cement; 40 parts of silica fume; 1000 parts of medium sand; 800 parts of gravel; 0.09 parts of lithium carbonate; 225 parts of water.

[0023] The sulphoaluminate cement of the present embodiment is sulphoaluminate cement 425 grade; The specific surface area of ​​silica fume is 10000cm 2 / g.

Embodiment 3

[0025] An early-strength shotcrete comprises the following raw materials in parts by weight: 420 parts of sulphoaluminate cement; 30 parts of silica fume; 850 parts of medium sand; 950 parts of gravel; 0.04 parts of lithium carbonate; and 195 parts of water.

[0026] The sulphoaluminate cement of the present embodiment is sulphoaluminate cement 525 grade; The specific surface area of ​​silica fume is 30000cm 2 / g; the fineness modulus of the medium sand is 2.5, the mud content is 2%, and the water content is 1.5%; the crushed stone is broken rice stone, the particle size ranges from 5 to 10 mm, and the water content is 1.5%.

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Abstract

The invention discloses early-strength sprayed concrete and belongs to the technical field of concrete. The early-strength sprayed concrete is prepared from, by weight, 400-450 parts of sulphate aluminium cement, 20-50 parts of silicon powder, 800-1000 parts of medium sand, 800-1000 parts of crushed stone, 1-2.5 parts of a water reducer, 0.03-0.09 part of lithium carbonate and 180-225 parts of water. The concrete is particularly suitable for quick repairing, emergency maintenance and supporting engineering of weak surrounding rock, and has the advantages of being quick in setting and early in strength, high in hour strength, high in resilience and low in production cost.

Description

technical field [0001] The invention relates to shotcrete, in particular to an early-strength shotcrete. Background technique [0002] Shotcrete is a kind of concrete that uses compressed air as power to pass concrete aggregates through pipes and nozzles, spray concrete slurry directly onto the surface of rocks or structures, and can harden within a few minutes (not more than 10 minutes). The essential difference between sprayed concrete and ordinary concrete is that its construction method is special. It uses a concrete sprayer to spray directly to the construction site. It does not need to support the formwork and only relies on the accelerator mixed in the cement concrete to make the concrete set in just a few minutes. Hardened, blasted rock or structures are strengthened and protected. Thereby saving formwork, pouring and demolition process, not only saving formwork materials but also greatly speeding up the construction speed and progress, greatly reducing the total li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B22/10C04B14/06C04B14/02
CPCC04B28/06C04B2111/00155
Inventor 王田堂林燕
Owner JIAHUA SPECIAL CEMENT
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