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A method for repairing reinforced concrete structures in construction engineering

A technology for reinforced concrete and construction engineering, which is applied in the field of repairing reinforced concrete structures in construction engineering. It can solve the problems of repairing mortar falling off, and the interface between the repairing mortar and old concrete cannot be firmly bonded, so as to disperse internal stress, inhibit crack expansion, and improve resistance. cracking effect

Active Publication Date: 2016-05-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, none of the above-mentioned existing repair methods can achieve the purpose of firmly bonding the interface between the repair mortar and the old concrete. Even if an interface agent is applied to strengthen the bonding strength of the interface between the repair mortar and the concrete structure, there is still a case where the repair mortar falls off.

Method used

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  • A method for repairing reinforced concrete structures in construction engineering
  • A method for repairing reinforced concrete structures in construction engineering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The invention creates the preparation of repair mortar: stir 70-80 parts of ordinary Portland cement, 20-30 parts of sulphoaluminate early-strength cement, and 120-180 parts of quartz sand aggregate in a mixer, and then add silica fume 5 -10 parts, 0.2-0.5 parts of polycarboxylate superplasticizer, 0.2-0.3 parts of hydroxycarboxylate retarder, 2-4 parts of silane-modified styrene-acrylic rubber powder, 0.05-0.1 parts of sulfate-based early strength agent, 0.05-0.15 parts of organosilicon defoamer, 10-15 parts of talcum powder, continue to stir evenly, and finally add 30-45 parts of water to obtain the repair mortar for reinforced concrete structure of construction engineering of the present invention.

[0013] The preparation process of the interface agent of the present invention is the same as the preparation process of the above-mentioned repair mortar, and only the quartz sand aggregate is not added during the initial stirring.

Embodiment 2-4

[0015] According to the parts by weight of the components in Table 1 below, the repair mortar and the interface agent shown in Examples 2-4 were respectively prepared using the same preparation steps as in Example 1. The performance indicators of the prepared repair mortar are shown in Table 2.

[0016] The composition of table 1 embodiment 2-4 repair mortar and interface agent

[0017]

[0018] Table 2 embodiment 2-4 repair mortar performance index

[0019]

Embodiment 5

[0021] Repair the concrete structural members with a crack width less than 0.3mm, clean the surface of the crack, and then directly brush the interface agent along the surface of the crack. Cover and seal with plastic cloth for 10-20 minutes, remove the plastic cloth, blow with an air gun until the surface of the interface agent is semi-dry, and then directly coat the interface agent with 3-5mm thick repair mortar for sealing treatment. The repair mortar uses the above-mentioned example 2 Made, wet curing for 5 days and then dry curing.

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Abstract

The invention provides a repair method of a construction engineering reinforced concrete structure, which comprises the following steps: brushing an interface agent, covering the interface agent with plastic cloth, sealing, and drying the interface agent in air. The repair mortar comprises 70-80 parts of ordinary Portland cement, 20-30 parts of sulfoaluminate early strength cement, 120-180 parts of quartz sand aggregate, 5-10 parts of silica fume, 0.2-0.5 part of polycarboxylic acid water reducer, 0.2-0.3 part of retarder, 2-4 parts of silane modified styrene-acrylic rubber powder, 0.05-0.1 part of early-strength admixture, 0.05-0.15 part of defoaming agent, 10-15 parts of talcum powder and 30-45 parts of water. The method can enhance the bonding strength between the repair mortar and old concrete interface and the bonding strength of the interface agent for the repair mortar and old concrete interface, improves the repair reliability of the reinforced concrete structure, and is especially suitable for public buildings, dwelling houses and other high-rise buildings.

Description

technical field [0001] The invention relates to a method for reinforcing and repairing concrete structures. Background technique [0002] Reinforced concrete structures are widely used in public and residential buildings. As the service life of the building increases, the concrete structure is affected by atmospheric carbonization, foundation settlement, and material shrinkage. Coastal or humid areas are subject to rain and atmospheric erosion all year round, and the reinforced concrete structure will be deformed and cracked. With the generation and expansion of cracks, the reinforced concrete will peel off and the bars will be exposed, which will accelerate the corrosion of the steel bars and the loosening of the structure, which will reduce the bearing capacity and durability of the reinforced concrete and seriously endanger the safety of people and property. [0003] The use of repair mortar to repair reinforced concrete structures can well inhibit the expansion of crack...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/50C04B28/06
Inventor 白锡庆王铁成赵海龙
Owner TIANJIN UNIV
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