A kind of cement-based engineering material with early strength, low shrinkage and high toughness and preparation method thereof

An engineering material, low-shrinkage technology, applied in climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of debonding between repair layer and base layer, high content of PVA fiber, limiting large-scale application, etc. Achieve the effect of improving debonding and cracking, good working performance and excellent volume stability.

Active Publication Date: 2018-10-09
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, ordinary cement-based engineering materials also have the following disadvantages: 1) they do not contain coarse aggregate, and the cement paste has a large content and large shrinkage, which is easy to cause debonding and cracking between the repair layer and the base layer; 2) the high content of PVA fiber, the viscosity Large, difficult to construct; 3) High cost
[0004] These shortcomings limit its large-scale application in the field of rapid repair of concrete structures

Method used

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  • A kind of cement-based engineering material with early strength, low shrinkage and high toughness and preparation method thereof
  • A kind of cement-based engineering material with early strength, low shrinkage and high toughness and preparation method thereof
  • A kind of cement-based engineering material with early strength, low shrinkage and high toughness and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of early-strength low-shrinkage high-toughness cement-based engineering material, the weight ratio of each raw material (kg / m 3 ) is: water 210, sulfoaluminate cement 480, ordinary Portland cement 60, silica fume 60, steel fiber 50, polyvinyl alcohol fiber 10, water reducing agent 7.2, early strength agent 0.21, retarder 1.8, river Sand 1200.

[0040] The above-mentioned preparation method of an early-strength low-shrinkage high-toughness cement-based engineering material comprises the following steps:

[0041] 1) Take raw materials according to the above raw material ratio;

[0042] 2) Take part of the water and heat it into warm water (the temperature of the warm water is 45-60° C.), respectively dissolving the early strength agent (lithium carbonate) and the retarder (boric acid) in warm water to obtain a lithium carbonate solution and a boric acid solution;

[0043] 3) Mix sulphoaluminate cement, ordinary Portland cement, silica fume and river sand dry-mixe...

Embodiment 2

[0049] A kind of early-strength low-shrinkage high-toughness cement-based engineering material, the weight ratio of each raw material (kg / m 3 ) is: water 220, sulfoaluminate cement 470, ordinary Portland cement 70, silica fume 60, steel fiber 60, polyvinyl alcohol fiber 8, water reducing agent 7, early strength agent 0.2, retarder 1.7, river Sand 1200.

[0050] The above-mentioned preparation method of an early-strength low-shrinkage high-toughness cement-based engineering material comprises the following steps:

[0051] 1) Take raw materials according to the above raw material ratio;

[0052] 2) Take part of the water and heat it into warm water (the temperature of the warm water is 45-60° C.), respectively dissolving the early strength agent (lithium carbonate) and the retarder (boric acid) in warm water to obtain a lithium carbonate solution and a boric acid solution;

[0053] 3) Mix sulphoaluminate cement, ordinary Portland cement, silica fume and river sand dry-mixed fo...

Embodiment 3

[0059] A kind of early-strength low-shrinkage high-toughness cement-based engineering material, the weight ratio of each raw material (kg / m 3 ) is: water 200, sulfoaluminate cement 490, ordinary Portland cement 60, silica fume 50, steel fiber 50, polyvinyl alcohol fiber 9, water reducing agent 7.1, early strength agent 0.22, retarder 1.8, river Sand 1210.

[0060] The above-mentioned preparation method of an early-strength low-shrinkage high-toughness cement-based engineering material comprises the following steps:

[0061] 1) Take raw materials according to the above raw material ratio;

[0062] 2) Take part of the water and heat it into warm water (the temperature of the warm water is 45-60° C.), respectively dissolving the early strength agent (lithium carbonate) and the retarder (boric acid) in warm water to obtain a lithium carbonate solution and a boric acid solution;

[0063] 3) Mix sulphoaluminate cement, ordinary Portland cement, silica fume and river sand dry-mixed...

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Abstract

The invention belongs to the field of building materials, and discloses an early-strength, low-shrinkage and high-toughness cement-based engineering material. The cement-based engineering material is prepared from 460-500kg / m<3> of sulphoaluminate cement, 50-70kg / m<3> of ordinary portland cement, 50-70kg / m<3> of silica fume, 40-60kg / m<3> of steel fibers, 8-10kg / m<3> of polyvinyl alcohol fibers, 200-220kg / m<3> of water, 7.0-7.4kg / m<3> of a water reducer, 0.2-0.22kg / m<3> of an early strength agent, 1.7-1.9kg / m<3> of a set retarder and 1180-1220kg / m<3> of river sands. The cement-based engineering material prepared in the invention has the advantages of good working performance, high early strength, greatly increased late strength, excellent mechanical performances and volume stability, high toughness, good mechanical performances and durability, and large practical application values.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an early-strength, low-shrinkage, high-toughness cement-based engineering material and a preparation method thereof. Background technique [0002] Cement-based engineering material (engineered cementitious composite, ECC) is a new type of cement-based composite material for engineering based on the optimal design of microscopic physical and mechanical principles. Its design concept was first proposed by Li Victor C of the University of Michigan in the 1990s. It is made of special organic synthetic fiber as one of the main materials, plus a special blending process, which has better tensile, wear-resistant, toughness, acid and alkali resistance, compactness, impact resistance, etc. than traditional cement-based materials. A series of high-quality features have been widely used in projects such as concrete structure protection, bridge deck repair, and non-expandable br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06C04B7/02C04B14/06C04B14/48C04B16/06C04B18/14C04B22/00C04B22/10C04B24/26
CPCC04B28/065C04B7/02C04B14/48C04B18/146C04B16/0641C04B14/068C04B24/26C04B22/10C04B22/0013Y02A30/30Y02W30/91
Inventor 黄遵鹏丁庆军徐波付军何良玉
Owner WUHAN UNIV OF TECH
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