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High-ductility repair dry powder mortar and preparation method thereof

A dry mortar, high ductility technology, applied in the field of building materials, can solve the problems of cement concrete damage, fracture, etc., to achieve stable quality, improve construction efficiency, improve ductility and crack resistance.

Inactive Publication Date: 2013-10-02
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of damage and fracture in existing cement concrete, the invention provides a high ductility repair dry powder mortar and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1.1 The weight ratio of high ductility repair dry powder mortar is as follows:

[0024] The weight ratio of each component of the composite cementitious material is: 25% of 42.5 grade rapid hardening sulfoaluminate cement, 10% of 42.5 grade ordinary Portland cement, 45% of fly ash (grade I), 5% of mineral powder (S95 grade) %, metakaolin 5%, latex powder 5%, silica fume 5%;

[0025] Additives account for the weight percentage of the composite gelling material: polycarboxylate water reducer (powder, water reducing rate 35%) 0.15%, defoamer 0.1%;

[0026] The weight ratio of aggregate (maximum particle size 0.6mm) to composite cementitious material is 36%;

[0027] The fiber content is 1.7% of the weight of the composite cementitious material.

[0028] 1.2 Preparation method

[0029] (1) Weigh the composite cementitious material, admixture, aggregate and fiber according to the ratio requirements;

[0030] (2) Evenly mix the weighed composite gelling material, admixtur...

Embodiment 2

[0035] 2.1 The weight ratio of high ductility repair mortar is as follows:

[0036] The weight ratio of each component of the composite cementitious material is: 34% of 42.5 grade rapid hardening sulfoaluminate cement, 5% of 42.5 grade ordinary Portland cement, 50% of fly ash, 8% of latex powder, and 3% of silica fume.

[0037] Additives account for the weight ratio of the composite gelling material: polycarboxylate water reducer (water reducing rate 35%) 0.3%, defoamer 0.1%, lithium carbonate 0.6%;

[0038] The weight ratio of aggregate (maximum particle size 0.4mm) to composite cementitious material is 40%;

[0039] The fiber content is 2.0% of the weight of the composite cementitious material.

[0040] 2.2 Preparation method

[0041] 1.2 with embodiment 1. In engineering application, the water consumption is 24% of the weight of high ductility repair dry mortar.

Embodiment 3

[0043] 3.1 The weight ratio of high ductility repair dry powder mortar is as follows:

[0044] The weight ratio of each component of the composite cementitious material is: 30% of 42.5 grade rapid hardening sulfoaluminate cement, 60% of fly ash, 4% of latex powder, and 6% of silica fume.

[0045] Additives account for the weight ratio of the composite gelling material: polycarboxylate water reducer (water reducing rate 35%) 0.25%, defoamer 0.1%;

[0046] The weight ratio of aggregate (maximum particle size 0.3mm) to composite cementitious material is 36%;

[0047] The fiber content is 2.0% of the weight of the composite cementitious material.

[0048] 2.2 Preparation method

[0049] 1.2 with embodiment 1. In engineering application, the water consumption is 26% of the weight of high ductility repair dry powder mortar.

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Abstract

The invention discloses high-ductility repair dry powder mortar. The high-ductility repair dry powder mortar consists of a composite gel material, an additive, aggregate and fiber, wherein the composite gel material consists of sulfoaluminate cement, Portland cement, coal ash, latex powder, mineral powder, silica fume and metakaolin; the additive consists of one or more of a water-reducing agent, a defoaming agent, a solidification adjusting agent and a water-retaining agent; and the weight ratio of the composite gel material to the additive to the aggregate to the fiber is 100:(0.1-3):(30-100):(1-3). The high-ductility repair dry powder mortar has high ductility and excellent crack resistance by optimizing constitution of a mortar matrix and mixing polyvinyl alcohol fiber; the sulfoaluminate cement and the Portland cement are compounded, so that early strength and later strength are guaranteed; the latex powder is added, so that the ductility and the crack resistance are further improved; and the repair mortar dry powder materials are mixed and stirred in advance according to the ratio, so stable quality of the repair mortar is guaranteed and the construction efficiency can be improved. The high-ductility repair dry powder mortar can be widely applied to quick repair and reinforcement products of roads, bridges, water conservancy, house buildings and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a dry powder mortar for repairing with high ductility and a preparation method thereof. Background technique [0002] Traditional cement concrete is a brittle material. Under the influence of long-term load and natural environment, the cement concrete structure is prone to damage and fracture. Timely repair and reinforcement of these damages will help to improve the service life of the cement concrete structure. Because roads, bridges, airport pavements, houses and other structures are in good use and have a major impact on economic and social development, it is particularly important to quickly repair and reinforce key structures. [0003] High-ductility fiber-reinforced cement-based composite (ECC) is a new type of material with strain hardening and multi-slit cracking characteristics optimized based on the principle of micromechanics. The uniaxial tensile ultimate s...

Claims

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Application Information

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IPC IPC(8): C04B28/06
Inventor 李国友张涛霍亮智艳飞
Owner CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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