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Elastic concrete used for rapidly repairing expansion joint

A technology of elastic concrete and expansion joints, applied in the field of elastic concrete, can solve the problems of low tensile strength and bond strength, increase the maintenance cost of traffic facilities, poor deformation ability, etc., and achieve fast curing speed, adjustable curing time and durability excellent effect

Active Publication Date: 2013-11-13
SHANGHAI RES INST OF BUILDING SCI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing expansion joint repair materials are brittle, poor in flexibility, poor in deformation ability, low in tensile strength and bonding strength, and are prone to secondary cracking during the operation of expansion joints, which not only brings great harm to transportation Great pressure, but also increased the maintenance cost of transportation facilities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Composition of elastic concrete for rapid repair of expansion joints:

[0029] Component A: MDI50 (BASF), packaged directly as Component A.

[0030] Component B: 100 parts of polyether polyol (GE-210 Takahashi Petrochemical), 15 parts of plasticizer dioctyl phthalate, 5 parts of chain extender 1,4-butanediol, catalyst February silicic acid 0.01 part of dibutyltin, 20 parts of filler calcium carbonate, 1 part of antioxidant tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol (hindered phenol 1010), 1 part of silane Foam agent (Airex932 Degussa) 0.5 parts, silane coupling agent (KH550) 20 parts. Mix the above raw materials with a high-speed disperser, pour them into a reaction kettle, stir and heat to 120°C, vacuum dehydrate for 2 hours, cool to room temperature and discharge to obtain component B.

[0031] Component C: 6-10 mesh, 10-20 mesh, 20-50 mesh, 50-100 mesh, 100-325 mesh graded river sand, mixed evenly with a dry powder mortar mixer, and...

Embodiment 2

[0036] Composition of elastic concrete for rapid repair of expansion joints:

[0037] A component: MDI (PM200 Yantai Wanhua), directly packaged as A component.

[0038] Component B: 100 parts of castor oil polyol, 30 parts of plasticizer dibutyl phthalate, 20 parts of chain extender trimethylolpropane, 0.5 part of catalyst triethylenediamine, 100 parts of filler calcium carbonate, Oxygen agent 2,6-di-tert-butyl-p-cresol (hindered phenol 264) 3 parts, silane defoamer (Airex932 Degussa) 1 part, silane coupling agent (KH550) 15 parts. Mix the above raw materials with a high-speed disperser, pour them into a reaction kettle, stir and heat to 110°C, vacuum dehydrate for 4 hours, cool to room temperature and discharge to obtain component B.

[0039] Component C: 6-10 mesh, 10-20 mesh, 20-50 mesh, 50-100 mesh, 100-325 mesh graded quartz sand, mixed evenly with a dry powder mortar mixer, and vacuum dried to get C component.

[0040] Take the above three components A, B, and C and mi...

Embodiment 3

[0044] Composition of elastic concrete for rapid repair of expansion joints:

[0045] Component A: 40 parts of IPDI (Yantai Wanhua), 60 parts of MDI (PM200 Yantai Wanhua), after mixing evenly, directly package as A component.

[0046] Component B: 100 parts of polyester polyol (PEA-1000 Yantai Wanhua), 30 parts of plasticizer glycol adipate, 10 parts of chain extender triethanolamine, 1 part of catalyst dimethylcyclohexylamine, filler 50 parts of titanium dioxide, 3 parts of silane defoamer (Airex944 Degussa), 5 parts of titanate coupling agent (LICA44). After mixing the above materials with a high-speed disperser, pour them into a reaction kettle, stir and heat to 80°C, vacuum dehydrate for 8 hours, cool to room temperature and discharge to obtain component B.

[0047] Component C: 72 parts of 6-10 mesh, 10-20 mesh, 20-50 mesh graded river sand; 50-100 mesh, 100-325 mesh graded 28 parts of quartz sand, mixed with dry powder mortar mixer Uniform, vacuum-dried to obtain compo...

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Abstract

The invention belongs to the field of building materials, and in particular relates to elastic concrete used for rapidly repairing an expansion joint. The elastic concrete is composed of three groups of materials, namely a material A, a material B and a material AC, wherein the weight ratio of the material A to the material B, to the material C is 1: (1-2.5): (8-18), the material A is composed of isocyanate or a prepolymer of the isocyanate, the material B is composed of the following components in parts by weight: 100-105 parts of polyhydric alcohols, 4-30 parts of a plasticizer, 5-20 parts of a chain extender, 0.01-1 part of a catalyst, 20-100 parts of a filler, 0-3 parts of an antioxidant, 0-3 parts of a defoamer, 0-30 parts of a coupling agent and 0-20 parts of a pigment, and the material C is aggregate. The elastic concrete has the advantages of high curing speed, adjustable curing time, good application property and self-leveling property. The elastic concrete is environment-friendly, good in toughness and small in contraction, has no generation of secondary cracking during operation process, good caking property with a base surface and excellent durability.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to an elastic concrete used for rapid repair of expansion joints. Background technique [0002] With the rapid development of my country's economic construction, the transportation network represented by roads, bridges and rail transit and the transportation industry have advanced by leaps and bounds and made great progress. The expansion joint is a very important part of the construction of the traffic structure, and its function is to adjust the displacement caused by the live load, environmental characteristics and physical properties of the building materials. Due to the long-term exposure of the expansion joints to the air, the harsh use environment is the most easily damaged and difficult to repair part of the highway, bridge, and rail transit structures. The destruction of expansion joints not only makes passing vehicles feel uncomfortable and lacks a sense of security, but...

Claims

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Application Information

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IPC IPC(8): C04B26/10C04B26/04C04B26/18
Inventor 仲小亮杨霞王霁新夏文丽
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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