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Quick repairing material and preparation method

A repair material and fast technology, applied in the field of rapid repair materials and preparation, can solve problems such as poor repair effect and poor toughness, and achieve the effect of fast hardening, high strength and toughness

Inactive Publication Date: 2018-01-05
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the object of the present invention is to provide a quick repair material and a preparation method, through which the repair effect caused by the temperature condition of -15°C to 40°C can be prevented, and at the same time, it can overcome the problem of cement The defect of poor toughness caused by the brittleness of the base material, the rapid repair material of the present invention also has the characteristics of being able to quickly repair concrete without drying shrinkage

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0035] The preparation process of the quick repair material of the present invention comprises the following steps:

[0036] Step 1: Add sulfoaluminate cement, fly ash, intermediate sand and polyvinyl alcohol fiber into the mixing tank, and stir evenly at 300-600 rpm for 5-10 minutes;

[0037] Step 2: Add water and chemical admixture to the mixture in Step 1, and stir evenly at 1000-1500 rpm for 2-3 minutes. In parts by mass, 26-28 parts per 100 parts of sulphoaluminate cement portion of water;

[0038] Step 3: Reduce the rotational speed to 300-600 rpm, stir for 2-3 minutes, and then pour the mixture into a mold for curing to obtain a quick repair material.

Embodiment 1

[0040]When the service temperature of the quick repair material is -15°C, mix 1000g of sulphoaluminate cement and 1000g of intermediate sand, stir at 300-600rpm for 5 minutes, add 260g of water, 12g of naphthalene-based high-efficiency water reducer, and 15g of carbonic acid Lithium and 20g of sodium chloride, stirred at 1000-1500rpm for 2 minutes, then stirred at 300-600rpm for 2 minutes, then poured the evenly stirred mixture into a mold for curing, and the initial setting time was 24min, and the final setting time was 34min, 2h compressive strength of 16MPa, 7d compressive strength of 48MPa quick repair material.

Embodiment 2

[0042] When the service temperature of the quick repair material is -10°C, mix 1000g of sulphoaluminate cement and 1000g of intermediate sand, stir at 300-600rpm for 5 minutes, add 260g of water, 10g of naphthalene-based high-efficiency water reducer, and 12g of carbonic acid Lithium and 15g of calcium nitrate, stirred at 1000-1500rpm for 2 minutes, then stirred at 300-600rpm for 2 minutes, then poured the evenly stirred mixture into a mold for curing, and the initial setting time was 23 minutes, and the final setting time was 34 minutes , 2h compressive strength of 18MPa, 7d compressive strength of 51MPa quick repair material.

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Abstract

The invention discloses a quick repairing material and a preparation method. The quick repairing material is prepared from sulphoaluminate cement, fly ash, intermediate sand, polyvinyl alcohol fiber,water and a chemical admixture, and comprises the following specific components: 100 parts of sulphoaluminate cement, 0-30 parts of fly ash, 80-100 parts of intermediate sand, 0.8-1.2 parts of a naphthalene water reducing agent, 0-0.5 part of borax, 0-0.12 part of sodium gluconate, 0-0.15 part of citric acid, 0-1.5 parts of lithium carbonate, 0-2.0 parts of aluminum sulfate, 0-1.5 parts of aluminum chloride, 0-1.5 parts of calcium nitrate, 0-2.0 parts of sodium chloride and 0-2.0 parts of polyvinyl alcohol fiber. Firstly, the repairing material can be constructed under the temperature condition of 10 DEG C below zero to 40 DEG C, the initial setting time is 15-25 minutes, and the final setting time is 25-35 minutes; secondly, the repairing material achieves excellent compressive strength,the 2h compressive strength is 15-45MPa, and the 7d compressive strength is 45-80MPa; finally, the polyvinyl alcohol fiber is selected for reinforcing the sulphoaluminate cement, so that the quick repairing material has the 1d folding strength of 10-12MPa, the 7d folding strength of 12-14MPa and the 7d bending strength of 5-7MPa, and is free of dry shrinkage, therefore, requirements on quick hardening, high strength and toughness of a repairing project can be met.

Description

technical field [0001] The invention belongs to the technical field of cement concrete application, and relates to a quick repair material and a preparation method. Background technique [0002] With the continuous improvement of infrastructure, the cost of restoration projects accounts for an increasing proportion of the total cost of buildings, and various restoration materials and restoration techniques are derived from this. During the restoration process, the temperature environment and the brittleness of cement-based materials most affect the restoration efficiency and effect. [0003] Patent CN1654411 adopts fast-hardening sulfoaluminate cement and special admixtures to prepare concrete rapid repair materials, in which high-efficiency water reducer is a water-reducing component, borate is a retarding component, sulfate is a mediating component, lithium salt is an early strong component. The 2h-6h strength of the rapid repair material can meet the needs of large-scal...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B111/72C04B111/34
Inventor 李国新张俊杰宋战平
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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