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
CN105906265AInactive Publication Date: 2016-08-31WUHAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
WUHAN UNIV OF TECH
Publication Date
2016-08-31
Estimated Expiration
Not applicable · inactive patent

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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.
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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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