Unlock instant, AI-driven research and patent intelligence for your innovation.

Material of cement-base for covering surface of bridge

A cement and mask technology, applied in the field of building materials, can solve the problems of falling off, bridge deck damage, low bonding strength, etc., and achieve the effect of extending service life, high flexural strength, and high bonding strength

Inactive Publication Date: 2007-03-07
TONGJI UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the survey, due to the low bond strength between the fine stone concrete and the base concrete, when the deformation does not match, it is easy to cause cracking or large areas to fall off, resulting in serious damage to the bridge deck
If organic materials such as waterproof paint are used to cover the surface, not only the cost is high, but the service life is relatively short, and its performance does not match the base concrete

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, cement-based bridge surface cover material is 43.75% of ordinary portland cement, quartz sand (8 mesh) 24.06%, quartz sand (18 mesh) 11.81%, quartz sand (60 mesh) 10.50%, limestone powder 5.69% , 0.11% cellulose, 1.23% polyvinyl acetate latex powder, 0.22% sulfamate superplasticizer, 2.63% sulfoaluminate expansion agent. When adding water accounting for 17% of the dry powder material and stirring, the expansion of the product can reach 280mm, the 28d compressive strength after hardening is 31.2MPa, the bonding tensile strength reaches 3.2MPa, the compressive shear bonding strength reaches 4.0MPa, and the 28d shrinkage rate Less than 0.05%, the impermeability grade is greater than S15.

Embodiment 2

[0033] Embodiment 2, cement-based bridge surface overlay material is 42.85% of slag cement, quartz sand (5 mesh) 26.14%, quartz sand (16 mesh) 10.28%, quartz sand (65 mesh) 9.43%, limestone powder 6.43%, cellulose 0.11%, polyvinyl acetate latex powder 1.37%, sulfamate superplasticizer 0.18%, sulfoaluminate expansion agent 3.21%. After adding water accounting for 19% of the dry powder material and stirring, the expansion of the product can reach 294mm, the 28d compressive strength after hardening is 35.0MPa, the bonding tensile strength reaches 3.0MPa, the compressive shear bonding strength reaches 4.4MPa, and the 28d shrinkage rate Less than 0.05%, the impermeability grade is greater than S15.

Embodiment 3

[0034] Embodiment 3, cement-based bridge surface cover material is by composite cement 33.21%, quartz sand (10 mesh) 25.882%, quartz sand (25 mesh) 18.266%, quartz sand (70 mesh) 14.945%, limestone powder 2.657%, cellulose 0.033%, polyvinyl acetate latex powder 0.365%, sulfamate water reducer 3.65%, sulfoaluminate expansion agent 3.21%. After adding water accounting for 19% of the dry powder material and stirring, the expansion of the product can reach 294mm, the 28d compressive strength after hardening is 35.0MPa, the bonding tensile strength reaches 3.0MPa, the compressive shear bonding strength reaches 4.4MPa, and the 28d shrinkage rate Less than 0.05%, the impermeability grade is greater than S15.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
compressive strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
shrinkageaaaaaaaaaa
Login to View More

Abstract

The invention relates to a cement-based material for covering surface of bridge composed of cement, quartz sand, limestone powder, fibrin, polyvinyl acetate latex powder, sodium sulfamate water reducer, and sulphoaluminate sweller. It can very efficiently cover the bridge-surface concrete, and because it has good water retentivity, high cohesive strength, low shrinkage and excellent anti-permeability, it can effectively seal the apertures and cracks of concrete basal layer, improve the cohesive strength between the pitch and the concrete basal layer, and prolong the service life of bridges. It is applied to the constructions (structures) of reinforced concrete, light aggregate concrete, bridges, buildings, irrigation works, etc.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a cement-based bridge deck overlay material. Background technique [0002] At present, after the concrete bridge deck laying or cast-in-place construction is completed, pour a layer of overlay material (50-100mm) on the concrete first, and then make the asphalt concrete surface layer, which has become the mainstream method of bridge construction. The purpose of pouring the overlay is: 1) leveling the base concrete; 2) improving the bonding strength between the asphalt surface and the base; 3) closing the pores and cracks on the base concrete surface to prevent the penetration of water, oil or other harmful media In base concrete, it will adversely affect the durability of base concrete. Indeed, after the construction of the cement concrete bridge deck, a certain number of cracks will inevitably occur, which will become a direct channel for the infiltration...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B14/06C04B28/18C04B24/38C04B26/18C04B22/14C04B24/16
Inventor 孙振平蒋正武
Owner TONGJI UNIV