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Special concrete for structure reinforcement and preparation method thereof

A concrete and special technology, applied in the field of concrete, can solve the problems of poor pouring and tamping effect, slow strength development, long transportation distance, etc.

Inactive Publication Date: 2021-02-09
SHANGHAI MEICHUANG ARCHITECTURAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a special concrete for structural reinforcement and its preparation method, in order to solve the existing grouting materials in the reconstruction and reinforcement conditions, such as mechanical properties mismatch, sand flooding and cracking, etc. The problem of poor effect, the self-compacting concrete of the mixing station is used for reconstruction and reinforcement, the common stress mismatch problem caused by shrinkage, the strength problem caused by long transportation distance and long construction time, and the segregation and generalization caused by the material's own performance. Problems of pouring and tamping effects such as sand and hollow drums, problems of construction difficulties, slow strength development, and unmatched systems caused by the use of traditional concrete in the reinforcement methods of existing structural engineering

Method used

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  • Special concrete for structure reinforcement and preparation method thereof
  • Special concrete for structure reinforcement and preparation method thereof
  • Special concrete for structure reinforcement and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] Example 1, a special concrete for structural reinforcement, according to cement 18, slag powder 3, fly ash 2.06, silica fume 1, water reducing agent 0.4, shrinkage compensating admixture 1.5, anti-crack fiber 0.04, bonding The weight ratio of agent 0 was weighed separately, mixed and prepared into dry powder, and then weighed according to coarse aggregate 36 and fine aggregate 38, mixed and prepared into aggregate, and then the dry powder and aggregate were added to the forced stirring device Pre-mixing in medium, then add water into the mixing device at one time and continue stirring to obtain the product ordinary special reinforced concrete C40;

Embodiment 2

[0035] Example 2, a special concrete for structural reinforcement, according to cement 24, slag powder 3, fly ash 2.76, silica fume 0, water reducer 0.7, shrinkage compensating admixture 1.5, anti-crack fiber 0.04, bonding The weight ratio of agent 0 was weighed separately, mixed and prepared into dry powder, and then weighed according to coarse aggregate 34 and fine aggregate 34, mixed and prepared into aggregate, and then the dry powder and aggregate were added to the forced stirring device Pre-mixing in medium, then add water into the mixing device at one time and continue stirring to obtain the product ordinary special reinforced concrete C60;

Embodiment 3

[0036] Example 3, a special concrete for structural reinforcement, according to cement 25, slag powder 2, fly ash 2.56, silica fume 0, water reducer 0.7, shrinkage compensating admixture 1.5, anti-crack fiber 0.04, bonding The weight ratio of agent 0.2 was weighed separately, mixed and prepared into dry powder, and then weighed separately according to coarse aggregate 34 and fine aggregate 34, mixed and prepared into aggregate, and then the dry powder and aggregate were added to the forced stirring device Pre-mixing in medium, then add water into the mixing device at one time and continue stirring to obtain the product early-strength special reinforced concrete C60.

[0037] The stress-strain model, strength standard value, strength design value, fatigue strength correction coefficient and elastic modulus of ordinary and early-strength special reinforced concrete are based on the strength grades in Table 3.1.2-2 and can be used in accordance with the current national standard "...

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Abstract

The invention belongs to the technical field of concrete, and discloses special concrete for structural reinforcement and a preparation method thereof. The special concrete is prepared from cement, mineral powder, fly ash, silica fume, fine aggregate, coarse aggregate, a water reducing agent, a shrinkage compensation admixture, anti-cracking fibers and a binder. The special reinforced concrete hasthe characteristics of self-compaction, no segregation, fast early strength development, controllable later strength, low shrinkage and the like, fills the market vacancy of reinforced concrete, is classified according to use conditions, avoids using one product to cope with all the conditions, and is divided into a common type and an early strength type according to different ages reaching the design strength. The common type is suitable for newly-added components in transformation and reinforcement and the situation that concrete vibration is difficult in a beam column joint steel bar densearea, a post-cast strip, a constructional column and the like in a newly-built project. The early strength type is suitable for transformation and reinforcement of locally-added components with the increased cross section and the tight construction period and suitable for concrete replacement.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a special concrete for structural reinforcement and a preparation method thereof. Background technique [0002] Concrete, referred to as "concrete" for short: refers to the collective name of engineering composite materials in which aggregates are cemented into a whole by cementitious materials. Generally speaking, the term concrete refers to the cement concrete obtained by using cement as the cementitious material, sand and stone as the aggregate; mixed with water (may contain admixtures and admixtures) in a certain proportion, and stirred. Concrete, which is widely used in civil engineering. [0003] With the improvement of people's living standards, people have higher and higher requirements for the safety and anti-seismic level of building structures, but the original safety and anti-seismic level of existing buildings generally cannot meet the requirements of c...

Claims

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Application Information

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IPC IPC(8): C04B28/04E04G21/02
CPCC04B28/04E04G21/02C04B18/141C04B18/08C04B18/146C04B2103/302C04B2103/0068C04B24/26C04B16/0633C04B14/14C04B14/06C04B22/002C04B16/0641
Inventor 徐凯
Owner SHANGHAI MEICHUANG ARCHITECTURAL MATERIALS
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