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Shrinkage-compensating rapid repairing material for bridge expansion joints

A technology for compensating shrinkage and repairing materials, which is applied in the field of bridge expansion joints with compensating shrinkage and quick repairing materials, can solve problems such as difficult maintenance of fast-hardening concrete, and achieve the effect of enhancing its own internal curing effect, enhancing volume stability and reducing cracking.

Pending Publication Date: 2020-04-10
HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it is difficult for rapid hardening concrete to be effectively maintained after it is opened to traffic, which has a great impact on the strength development and volume stability of concrete

Method used

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  • Shrinkage-compensating rapid repairing material for bridge expansion joints
  • Shrinkage-compensating rapid repairing material for bridge expansion joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation of 1# Bridge Expansion Joint Compensating Shrinkage Rapid Repair Material

[0035] The mass ratio of the raw materials used is: 25 parts of cement (42.5 grade ordinary Portland cement and rapid hardening sulfoaluminate cement prepared at a mass ratio of 1:6), 2 parts of gypsum powder, 3 parts of silica powder, expansion agent ( Light-burned magnesia expansion agent and calcium oxide expansion agent are prepared at a mass ratio of 1:5) 4 parts, 30 parts of quartz sand, 36 parts of crushed stone, 0.05 part of water reducer, retarder (sodium gluconate and tartaric acid by mass Ratio 3:1) 0.05 parts, super absorbent resin 0.05 parts, lithium carbonate 0.01 parts, defoamer 0.005 parts, water-binder ratio 0.25.

[0036] During construction, first chisel away the concrete at the cracked part of the expansion joint of the bridge, rinse and clean the pit, if no clear water is seen; put all the raw materials into the mixing pot and dry mix for three minutes,...

Embodiment 2

[0037] Example 2 Preparation of 2# Bridge Expansion Joint Compensating Shrinkage Rapid Repair Material

[0038] The mass ratio of the raw materials used is: 40 parts of cement (grade 42.5 ordinary portland cement and rapid hardening sulfoaluminate cement prepared at a mass ratio of 3:1), 2 parts of gypsum powder, 3 parts of silica powder, expansion agent ( 2 parts of light-burned magnesia expansion agent and calcium oxide expansion agent according to the mass ratio of 1:2), 30 parts of quartz sand, 36 parts of crushed stone, 0.1 part of water reducer, retarder (sodium gluconate and tartaric acid by mass Ratio 2:1) 0.05 parts, super absorbent resin 0.08 parts, lithium sulfate 0.01 parts, defoamer 0.005 parts, water-binder ratio 0.25.

[0039] Construction method is the same as embodiment 1.

Embodiment 3

[0040] Example 3 Preparation of 3# Bridge Expansion Joint Compensating Shrinkage Rapid Repair Material

[0041]The mass ratio of raw materials used is: 30 parts of cement (grade 42.5 ordinary Portland cement and rapid hardening sulfoaluminate cement prepared at a mass ratio of 2:1), 2 parts of gypsum powder, 3 parts of silica powder, expansion agent ( 2 parts of light-burned magnesia expansion agent and calcium oxide expansion agent according to the mass ratio of 1:2), 25 parts of quartz sand, 40 parts of crushed stone, 0.05 parts of water reducer, retarder (sodium gluconate and tartaric acid by mass Ratio 2:1) 0.15 parts, super absorbent resin 0.05 parts, lithium carbonate 0.01 parts, defoamer 0.005 parts, water-binder ratio 0.25.

[0042] Construction method is the same as embodiment 1.

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Abstract

The invention discloses a shrinkage-compensating rapid repairing material for bridge expansion joints. The shrinkage-compensating rapid repairing material is prepared from 25-40 parts of cement, 0-4 parts of gypsum powder, 2-4 parts of silica powder, 1-4 parts of an expanding agent, 25-33 parts of quartz sand and 32-40 parts of gravel, 0.05-0.1 part of a water reducing agent, 0.05-0.15 part of a retarder, 0.01-0.1 part of super absorbent resin, 0.005-0.01 part of a lithium salt and 0-0.01 part of a defoaming agent. The raw materials used in the invention are reasonably proportioned; early strength is high, the fastest 1h can reach 30MPa or above; the later strength is stably increased, the 28-day strength can reach 60 MPa or above, when the shrinkage-compensating rapid repairing material is used as a bridge expansion joint or concrete pavement repairing material, the self internal curing effect of the concrete can be enhanced, the volume shrinkage of the hardened concrete is reduced, the volume stability of the hardened concrete is enhanced, and the requirement for rapid traffic opening is met.

Description

technical field [0001] The invention relates to a pavement concrete repair technology, in particular to a contraction-compensating quick-repair material for bridge expansion joints. Background technique [0002] With the increase of highway traffic, the load of concrete on the road surface has increased sharply. Some cement concrete pavements have insufficient bearing capacity or subgrade defects, resulting in varying degrees of cracking and damage to the concrete pavement, and the decrease in road surface flatness directly affects driving comfort. In road bridges, expansion joints are an extremely important part of bridge engineering. If the concrete in the anchorage area of ​​bridge expansion joints cracks or breaks, it will directly affect the operation and use of the bridge. [0003] Due to its excellent mechanical properties and durability, reinforced concrete can meet the requirements of traffic bearing and anchoring bridge expansion devices. Use ordinary concrete mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
CPCC04B28/06C04B2201/50C04B7/02C04B22/066C04B22/064C04B22/143C04B14/062C04B14/06C04B14/02C04B2103/302C04B24/10C04B24/06C04B24/24C04B22/10C04B2103/50C04B22/147
Inventor 王笑风杨博张晓果褚付克郑洁万晨光陈蒙蒙
Owner HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD
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