Repair mortar for concrete member and preparation method thereof

A technology for repairing mortar and concrete, applied in the field of cement-based mortar, can solve the problems of reducing the bonding strength and mechanical strength of repairing mortar, shrinking and cracking of repairing mortar, and excessively fast water loss, so as to improve volume stability and reduce water-to-binder ratio. , Improve the effect of sag resistance

Inactive Publication Date: 2021-05-28
成都建工赛利混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that after the repair mortar repairs the concrete components, due to the limited construction site conditions, it is usually impossible to carry out moisturizing and heat preservation maintenance, and the repair mortar is prone to shrinkage and cracking; The repair layer is thin, and the water in the slurry loses too fast, which reduces the bonding strength and mechanical strength of the repair mortar to a certain extent, and has a certain adverse effect on the service life of the repair mortar.

Method used

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  • Repair mortar for concrete member and preparation method thereof
  • Repair mortar for concrete member and preparation method thereof
  • Repair mortar for concrete member and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: be used for the repair mortar of concrete component, specifically adopt following method to prepare, comprise the steps:

[0043] S1 admixture: Take 418.5kg of cement, add 28kg of silica fume, 23.5kg of expansion agent, 23.5kg of quick-setting agent, 28.2kg of rubber powder, 0.94kg of defoamer and 9.4kg of shrinkage-reducing polycarboxylate superplasticizer, mix well, Prepare powder material.

[0044] Preparation of S2 mortar: Take 90kg of water, pour it into a mixing pot, add powder materials, stir at a speed of 70 rpm for 120s, add 500kg of dry sand with a particle size of 0.15-0.3mm, and continue stirring for 120s to prepare a mortar for concrete Component repair mortar.

Embodiment 2

[0045] Embodiment 2: be used for the repair mortar of concrete component, specifically adopt following method to prepare, comprise the steps:

[0046] S1 admixture: Take 418.5kg of cement, add 28kg of silica fume, 23.5kg of plastic expansion agent, 23.5kg of quick-setting agent, 28.2kg of rubber powder, 0.94kg of defoamer and 9.4kg of shrinkage-reducing polycarboxylate superplasticizer, and mix well , to obtain a powder material.

[0047] S2 sand mixing: Take 100kg of sand with a particle size of 0.075-0.15mm, add 150kg of sand with a particle size of 0.15-0.3mm and 250kg of sand with a particle size of 0.3-0.6mm, the sand is dry sand, and mix evenly to obtain a gradation sand.

[0048] S3 mortar preparation: Take 90kg of water, pour it into a mixing pot, add powder materials, stir at a speed of 70 rpm for 120s, add graded sand, and continue stirring for 120s to prepare repair mortar for concrete components.

Embodiment 3-6

[0050] The difference between Example 3-6 and Example 2 is that the addition amount of each raw material in Example 3-6 is different, and the others are consistent with Example 2. The addition amount of each raw material in Example 3-6 is shown in Table 2.

[0051] The addition of each raw material of table 2 embodiment 3-6

[0052]

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Abstract

The invention discloses repair mortar for a concrete member and a preparation method thereof, which relate to the technical field of cement-based mortar. The repair mortar for the concrete member is mainly prepared from an additive and 1060 parts by weight of an internal admixture. The additive comprises the following raw materials in parts by weight based on the total weight of the repair mortar: 0.5-1.5 parts of a defoaming agent, 20-30 parts of an expanding agent, 25-35 parts of rubber powder and 8-12 parts of a water reducing agent; the internal admixture comprises the following raw materials in parts by weight based on the total weight of the internal admixture: 85-105 parts of water, 390-420 parts of cement, 20-35 parts of silica fume, 20-35 parts of an accelerator and 450-550 parts of graded sand. The repair mortar has the advantage of high bonding strength. The preparation method comprises the following steps of material mixing, sand mixing, mortar preparation and the like. The preparation method has the advantage that the bonding strength of the product can be improved.

Description

technical field [0001] The present application relates to the technical field of cement-based mortar, in particular to a repair mortar for concrete components and a preparation method thereof. Background technique [0002] With the development of the concrete industry, precast concrete has gradually been widely used due to its advantages of convenient construction and easy recycling. In the concrete industry, the proportion of concrete prefabrication is gradually increasing. However, due to technical or artificial reasons, during the process of concrete prefabrication, transportation and installation, defects such as potholes and drop corners will appear in precast concrete. [0003] In order to prevent the defects from continuing to expand, it is necessary to repair the defects of precast concrete with repair mortar. At present, the commonly used repair mortar is made of raw materials such as cement and quartz sand, which is used to repair the defects of concrete component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B111/72
CPCC04B28/00C04B2111/72C04B2103/50C04B2103/302C04B18/146C04B2103/12C04B14/06C04B2103/0057C04B24/383C04B24/38
Inventor 彭丙杰和德亮罗小东吴涛吴伟陶俊
Owner 成都建工赛利混凝土有限公司
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