Repair mortar for hydraulic structure concrete

Abstract

The invention relates to the technical field of concrete, in particular to repair mortar for hydraulic structure concrete, the repair mortar comprises mortar A and mortar B which are mixed together, the mortar A comprises a first modifier, first glass yarn and first elastic polyurethane; the mortar B comprises the following components: a second modifier, second glass yarn, glass powder, crystal whiskers, calcium carbonate, nano silicon dioxide and second elastic polyurethane, and the particle size of the first glass yarn is greater than that of the second glass yarn. The mortar is different from a single flexible or rigid protective repairing material, has excellent flexibility and can meet certain strength requirements, protection can be quickly formed during repairing, the mortar reaches the technical index 12 hours after the repairing mortar is laid and flattened, the repairing time is remarkably shortened, and the repairing effect is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, in particular to a repair mortar for hydraulic structure concrete. Background Art

[0002] Some hydraulic structures are often washed by high-speed sand-laden water flow, which causes the surface concrete to be eroded, and in severe cases, catastrophic accidents. In order to avoid catastrophic accidents, it is necessary to repair the eroded concrete on the surface. The current repair materials have poor repair effects, which seriously affect the safety of hydraulic structures. Summary of the invention

[0003] The technical problem solved by the invention is to provide a repair mortar with better repair effect for hydraulic structure concrete.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a repair mortar for hydraulic structure concrete includes a mixed mortar A and a mixed mortar B, wherein the components of the mortar A are a first modifier, a first glass yarn and a first elastic polyurethane; the components of the mortar B are a second modifier, a second glass yarn, glass powder, whiskers, calcium carbonate, nano-silicon dioxide and a second elastic polyurethane, and the particle size of the first glass yarn is larger than that of the second glass yarn.

[0005] Furthermore, the parameters of the repair mortar are: compressive strength greater than 15MPa; tensile strength greater than 3MPa; bonding strength with concrete greater than 2MPa; elongation greater than 10%; impact resistance greater than 15,000 times; and compressive elastic modulus less than 50MPa.

[0006] Furthermore, the preparation process of the A mortar is as follows: a1: mixing the first modifier and the first glass yarn together to obtain a first mixture; a2: drying the first mixture to obtain a first modified glass yarn; a3: adding the first elastic polyurethane to the first modified glass yarn, mixing and stirring to obtain the A mortar.

[0007] Furthermore, the preparation process of the B mortar is as follows: b1: mixing the second modifier, the second glass yarn and the glass powder together to obtain a second mixture; b2: drying the second mixture to obtain a second modified glass yarn; b3: adding whiskers, calcium carbonate, nano-silicon dioxide and a second elastic polyurethane to the second modified glass yarn in sequence, mixing and stirring to obtain the B mortar.

[0008] The beneficial effects of the present invention are as follows: the repair mortar of the present invention comprises mortar A and mortar B mixed together, and the parameters of the repair mortar are: compressive strength greater than 15MPa; tensile strength greater than 3MPa; bonding strength with concrete greater than 2MPa; elongation greater than 10%; impact resistance greater than 15,000 times; and compressive elastic modulus less than 50MPa. The mortar is different from a single flexible or rigid protective repair material. It also has excellent flexibility and can meet certain strength requirements. It can quickly form protection during repair. The repair mortar reaches its technical indicators 12 hours after it is laid and smoothed, which significantly improves the repair time and repair effect. DETAILED DESCRIPTION

[0009] The present invention is used for repairing mortar of hydraulic structure concrete, including mixed A mortar and B mortar, the components of A mortar are the first modifier, the first glass yarn and the first elastic polyurethane; the components of B mortar are the second modifier, the second glass yarn, glass powder, whisker, calcium carbonate, nano silicon dioxide, the second elastic polyurethane, the particle size of the first glass yarn is larger than the particle size of the second glass yarn, and the parameters of the repair mortar are: compressive strength is greater than 15MPa; tensile strength is greater than 3MPa; bonding strength with concrete is greater than 2MPa; elongation is greater than 10%; impact resistance is greater than 15000 times; compression elastic modulus is less than 50MPa. The mortar is different from a single flexible or rigid protective repair material, and it has excellent flexibility and can meet certain strength requirements. It can quickly form protection during repair. The mortar reaches its technical indicators 12 hours after the repair mortar is laid and smoothed, which significantly improves the repair time and repair effect.

[0010] The first modifier is a silane coupling agent, which is a low-molecular-weight organic silicon compound with a special structure. The silane coupling agent can interact with both the hydroxyl groups in inorganic substances and the long molecular chains in organic polymers to couple the two materials with different properties, thereby improving the performance between glass sand and polyurethane in the present invention and improving the tensile strength, elongation and impact strength of the materials.

[0011] The second modifier is titanate coupling agent, which also has the function of combining inorganic fillers and polymers well and improving physical properties. Since the fillers in mortar B are finer, it was found in the experiment that the use of titanate coupling agent can better disperse in polyurethane, reduce the consistency of the filling system, increase the filling amount, reduce mechanical wear, save power consumption, and reduce costs.

[0012] The use of the first modifier and the second modifier can improve the bonding strength of each component in the mortar, thereby quickly forming protection.

[0013] A mortar and B mortar are prepared separately first, and then mixed together at the repair site. Specifically, the preparation process of A mortar is as follows: a1: mixing the first modifier and the first glass yarn together to obtain a first mixture; a2: drying the first mixture to obtain a first modified glass yarn; a3: adding the first elastic polyurethane to the first modified glass yarn, mixing and stirring to obtain A mortar.

[0014] The preparation process of the B mortar is as follows: b1: mixing the second modifier, the second glass yarn and the glass powder together to obtain a second mixture; b2: drying the second mixture to obtain a second modified glass yarn; b3: adding whiskers, calcium carbonate, nano-silicon dioxide and a second elastic polyurethane to the second modified glass yarn in sequence, mixing and stirring to obtain the B mortar.

[0015] The process of using the repair mortar of the present invention to repair the concrete of hydraulic structures is as follows: 1. Clean the damaged surface of the concrete of the hydraulic structure; 2. Before use, stir the A mortar and the B mortar separately to make them mix evenly, then mix the A mortar and the B mortar and stir them evenly. The mixed A mortar and B mortar must be used within 2 hours; 3. Select an appropriate amount of repair mortar for the repair surface, lay it on the damaged surface and smooth it.

Claims

1. A repair mortar for hydraulic structure concrete, characterized in that: It comprises mortar A and mortar B which are mixed together. The components of mortar A are a first modifier, a first glass yarn and a first elastic polyurethane. The components of mortar B are a second modifier, a second glass yarn, glass powder, whisker, calcium carbonate, nano-silicon dioxide and a second elastic polyurethane. The particle size of the first glass yarn is larger than that of the second glass yarn.

2. The repair mortar for hydraulic structure concrete according to claim 1, characterized in that: The parameters of the repair mortar are: compressive strength greater than 15MPa; tensile strength greater than 3MPa; The bonding strength with concrete is greater than 2MPa; the elongation is greater than 10%; the impact resistance is greater than 15,000 times; and the compressive elastic modulus is less than 50MPa.

3. The repair mortar for hydraulic structure concrete according to claim 1, characterized in that: The preparation process of the A mortar is as follows: a1: mixing the first modifier and the first glass yarn together to obtain a first mixture; a2: drying the first mixture to obtain the first modified glass yarn; a3: Add the first elastic polyurethane to the first modified glass yarn, mix and stir to obtain mortar A.

4. The repair mortar for hydraulic structure concrete according to any one of claims 1 to 3, characterized in that: The preparation process of the B mortar is as follows: b1: mixing the second modifier, the second glass yarn and the glass powder together to obtain a second mixture; b2: drying the second mixture to obtain a second modified glass yarn; b3: Add whiskers, calcium carbonate, nano-silicon dioxide and the second elastic polyurethane to the second modified glass yarn in sequence, mix and stir to obtain mortar B.