Concrete member mending agent, preparation method and construction method

A construction method and repairing agent technology, which are used in earth-moving drilling, construction maintenance, shaft equipment and other directions, can solve the problems of large hydration shrinkage of cement slurry, insufficient cohesion, and easy cracking, and achieve improved construction performance, The effect of reducing construction strength and good appearance

Active Publication Date: 2014-06-11
CHINA RAILWAY 19 BUREAU GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of direct cement slurry repair has the following disadvantages: after the cement slurry is hardened, the bonding force with the structural base is not enough, and it is easy to fall off after a period of use; the hydration shrinkage of the cement slurry is large, and it is easy to crack after hardening; The color is inconsistent with the color of the base concrete, and there is a color difference

Method used

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  • Concrete member mending agent, preparation method and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The formula of the repair agent is as follows:

[0068] P.O42.5 Portland cement: 240kg;

[0069] Grade 42.5 sulphoaluminate cement: 60kg;

[0070] Grade Ⅱ fly ash: 150kg;

[0071] S95 grade mineral powder: 100kg;

[0072] 70-120 mesh quartz sand: 280kg;

[0073] Rubber powder 8031H: 50kg;

[0074] Rubber powder 5011L: 20kg;

[0075] Cellulose ether 10007P4: 0.5kg;

[0076] Thixotropic lubricant 602: 5kg.

[0077] The preparation process is as follows: accurately weigh each raw material component of the above-mentioned weight, mix and stir evenly to obtain.

[0078] The construction process is as follows:

[0079] (1) The concrete components such as bridge piers, beam bodies, tunnels, track slabs, etc. to be treated are first cleaned with wire brush to clean the surface of the floating slurry;

[0080] (2) Sprinkle water on the surface of the concrete component to be treated until the concrete surface is saturated with water;

[0081] (3) Mix the repair agent and water in a ratio of water:...

Embodiment 2

[0094] The cement paint formula is as follows:

[0095] P.O42.5 Portland cement: 232kg;

[0096] Level 42.5 sulphoaluminate cement: 58kg;

[0097] Grade Ⅱ fly ash: 100kg;

[0098] S95 grade mineral powder: 160kg;

[0099] 70-120 mesh quartz sand: 300kg;

[0100] Rubber powder 8031H: 45kg;

[0101] Rubber powder 5011L: 20kg;

[0102] Cellulose ether 10007P4: 1kg;

[0103] Thixotropic lubricant 602: 7kg.

[0104] The preparation process is as follows: accurately weigh each raw material component of the above-mentioned weight, mix and stir evenly to obtain.

[0105] The construction process is as follows:

[0106] (1) The concrete components such as bridge piers, beam bodies, tunnels, track slabs, etc. to be treated are first cleaned with wire brush to clean the surface of the floating slurry;

[0107] (2) Sprinkle water on the surface of the concrete member to be treated until the surface is saturated with water;

[0108] (3) Apply the dry powder of the repair agent to the surface of the component...

Embodiment 3

[0117] The formula of the repair agent is as follows:

[0118] P.O42.5 Portland cement: 260kg;

[0119] Grade 42.5 sulphoaluminate cement: 75kg;

[0120] Grade Ⅱ fly ash: 90kg;

[0121] S95 grade mineral powder: 170kg;

[0122] 70-120 mesh quartz sand: 260kg;

[0123] Rubber powder 8031H: 45kg;

[0124] Rubber powder 5011L: 25kg;

[0125] Cellulose ether 10007P4: 1.3kg;

[0126] Thixotropic lubricant 602: 9kg.

[0127] The preparation method and construction method are the same as in Example 1.

[0128] The performance test after construction and treatment according to the aforementioned construction method is as follows:

[0129] (1) The appearance color is basically the same as the base color of the concrete member;

[0130] (2) Low water absorption, the 5 hours water absorption of the Caston tube is 0.7ml;

[0131] (3) Scrub resistance, can withstand 20,000 scrubs without showing the bottom;

[0132] (4) No obvious efflorescence phenomenon;

[0133] (5) The tensile bonding strength is high, and...

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Abstract

The invention relates to a concrete member mending agent which comprises concrete, coal ash, mineral powder, quartz sand, redispersible gelatine powder, water-retaining agent and thixotropic lubricant. The invention further relate to preparation method and construction method of the mending agent. The color of the mending agent is basically consistent with the color of a concrete member after hardening, and the mended concrete member has good appearance. The mending agent provided by the invention has longer service life, is wipe-wash-resistant and high in binding strength, and no secondary cracking can occur after mending. The preparation method and the construction method are simple and easy to implement.

Description

Technical field [0001] The invention relates to the field of building materials, in particular to a repair agent for concrete members, a preparation method thereof, and a construction method of the repair agent. Background technique [0002] In the current construction process, concrete structures are generally prone to appearance quality defects such as honeycomb pitted surface, sand holes, water lines, exposed rocks, air bubbles and cracks. The main reasons for this are as follows: the quality of raw materials fluctuates greatly, and the concrete mix ratio is not effectively adjusted in time, resulting in bleeding, segregation and foaming; the concrete mixing time is seriously insufficient, resulting in a relatively homogeneous concrete after pouring. Poor; improper concrete pouring method and the phenomenon of leakage or over-vibration during vibrating cause concrete segregation; early concrete curing is not timely, resulting in cracks on the surface of the structure. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06C04B28/04E04G21/02E04G23/02E01D21/00E01D22/00E21D11/10E01B31/20
Inventor 孙建新侯希承宋胜林薄春莲
Owner CHINA RAILWAY 19 BUREAU GRP CO LTD
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