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Waterproof flexible cement-based dry-mixed overlay repairing mortar

A repairing mortar and waterproof technology, which is applied in the field of building materials, can solve the problems of poor impermeability, poor flexibility, surface cracking, etc., achieve high interface bonding strength, improve water retention capacity, and improve freeze-thaw resistance

Inactive Publication Date: 2016-08-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of cracking, hollowing or even falling off caused by surface damage or deformation caused by poor impermeability and poor flexibility of the outer wall of a concrete building in service, and provides a waterproof flexible cement-based dry-mix overlay repair mortar

Method used

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  • Waterproof flexible cement-based dry-mixed overlay repairing mortar
  • Waterproof flexible cement-based dry-mixed overlay repairing mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The quality ratio of waterproof flexible cement-based dry-mix overlay repair mortar is as follows:

[0038] P·O 52.5 grade cement: 22

[0039] Class I fly ash: 2

[0040] Vinyl acetate-ethylene copolymer rubber powder: 0.9

[0041] Hydroxypropyl methylcellulose ether: 0.05

[0042] Polyether modified silicon defoamer: 0.03

[0043] UEA expansion agent: 0.02

[0044] Natural Sand: 75

[0045] Preparation

[0046]Weigh the composite cementitious material, admixture and aggregate respectively according to the ratio of raw materials; mix the weighed composite cementitious material and admixture evenly in a mixing mixer to form a dry mixture; dry mix the above uniformly mixed The material and the aggregate are mixed evenly in a mixing mixer; the evenly mixed waterproof flexible cement-based dry-mix overlay repair mortar is stored or bagged, and the product is ready.

[0047] In engineering application, the water consumption is 10% of the total mass of waterproof flexi...

Embodiment 2

[0049] The quality ratio of waterproof flexible cement-based dry-mix overlay repair mortar is as follows:

[0050] P·O 42.5 grade cement: 39

[0051] Class I fly ash: 18

[0052] Acrylic copolymer rubber powder: 2.1

[0053] Hydroxyethyl methyl cellulose ether: 0.45

[0054] Silicone defoamer: 0.3

[0055] AEA expansion agent: 0.15

[0056] Natural Sand: 40

[0057] The preparation method is the same as in Example 1. In engineering application, the water consumption is 20% of the total mass of waterproof flexible cement-based dry-mix overlay repair mortar.

Embodiment 3

[0059] The quality ratio of waterproof flexible cement-based dry-mix overlay repair mortar is as follows:

[0060] P·O 52.5 grade cement: 25

[0061] Class I fly ash: 4

[0062] SBR powder: 1.5

[0063] Hydroxypropyl methylcellulose ether: 0.05

[0064] Polyether modified silicon defoamer: 0.3

[0065] CEA expansion agent: 0.15

[0066] Natural Sand: 69

[0067] The preparation method is the same as in Example 1. In engineering application, the water consumption is 12% of the total mass of waterproof flexible cement-based dry-mix overlay repair mortar.

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Abstract

The invention discloses a waterproof flexible cement-based dry-mixed overlay repairing mortar. A dry mixed material includes, by weight, 22-39 parts of ordinary Portland cement, 2-18 parts of fly ash, 0.9-2.1 parts of rubber powder, 0.05-0.45 parts of cellulose ether, 0.03-0.3 parts of a defoamer, 0.02-0.15 parts of an expanding agent, and 40-75 parts of natural sand. During usage, water accounting for 10-20% of the total mass of the mortar is added to the dry mixed material to obtain the waterproof flexible cement-based dry-mixed overlay repairing mortar. The fly ash refines the internal structure of the cement-based repairing mortar, and by means of compounding effects of the additives, the mortar is ensured to have flexibility and anti-permeability and excellent flexural strength and compressive strength. The 3d compressive strength of the mortar is 20-30 MPa and 28 d compressive strength of the mortar is 36-45 MPa, so that the mortar can satisfy repairing strength demand of common concrete building external walls.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a waterproof flexible cement-based dry-mix overlay repair mortar. Background technique [0002] Because ordinary cement-based repair mortar is a typical brittle material, it presents a porous and loose structure, and its impermeability is poor, the interface bond strength is low, the freeze-thaw resistance is poor, and the corrosion resistance is poor, especially its impermeability is extremely poor. And there are defects of excessive brittleness, high indentation ratio and poor deformation coordination ability. Under the joint action of load and environmental factors, the long-term interfacial bond strength of cement concrete building exterior walls repaired by cement-based repair mortar with high brittleness and poor impermeability will appear shrinkage phenomenon, which can easily cause its occurrence. Phenomena such as cracking, hollowing or even falling off canno...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/27C04B111/72C04B111/50
CPCC04B28/04C04B2111/27C04B2111/50C04B2111/72C04B2201/50C04B18/08C04B24/2623C04B24/383C04B24/42C04B2103/0068C04B14/068C04B24/2641C04B24/2676
Inventor 赵青林周海涛
Owner WUHAN UNIV OF TECH
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