Inorganic binder for new and old concrete interfaces

A technology of new and old concrete and inorganic binder, which is applied in the field of civil engineering and building materials, can solve the problems of poor durability of organic materials, and achieve the effect of eliminating weak surfaces

Inactive Publication Date: 2011-11-23
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can not only make the mechanical properties of the new and old concrete interface better than that of the concrete body, eliminate the weak surfac

Method used

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  • Inorganic binder for new and old concrete interfaces
  • Inorganic binder for new and old concrete interfaces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] (1) Basic treatment

[0017] For the old concrete base, use sandblasting to remove stains, oil stains, gray skin, scum, etc. The base should be solid and not loose, and if it is loose, it should be removed. It can also be washed with water to wet the surface of the base layer and be careful not to leave open water.

[0018] (2) spraying construction

[0019] Shake the old and new concrete adhesive vigorously, use a sprayer to spray the entire construction surface, that is, the old concrete base layer, evenly, and control the amount to 6-8m 2 / kg.

[0020] (3) Pouring new concrete

[0021] According to engineering needs and construction requirements, pour new concrete and maintain it.

[0022] (4) Precautions

[0023] The ambient temperature in the construction area is between 5°C and 36°C, and the surface temperature of the substrate should be greater than 2°C. It should not be constructed in severe weather such as strong sunlight, strong wind, rain and snow. The...

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Abstract

The invention discloses an inorganic binder for new and old concrete interfaces. The inorganic binder is mainly prepared from the following raw materials in percentage by mass: 7.5 percent of nano silica, 2.5 percent of nano calcium carbonate, 1.5 percent of nano silicon, 85.0 percent of distilled water and trace active catalyst and 3.5 percent of milled glass fiber. The binder makes the new and old concrete interfaces effectively bound into a whole, can make the mechanical properties of the new and old concrete interfaces superior to those of concrete, eliminates a weakness plane of the new and old concrete interfaces, has the characteristics of consistence with concrete deformation, high durability, convenience in construction, nontoxicity and the like, and can be widely applied to concrete construction or concrete engineering maintenance in engineering such as bridges, house buildings, roads and water conservancy and hydropower and the like.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and construction materials, and in particular relates to an inorganic binder for the interface between new and old concrete used in civil engineering or water conservancy construction engineering. Background technique [0002] With the construction of large-scale infrastructure in China and the maintenance of a large number of existing concrete projects, the problem of combining old and new concrete interfaces is often encountered in concrete construction or maintenance projects. Generally speaking, when no adhesive is used, the bonding strength of the old and new concrete interface is low, and it is easy to form a structural weak surface. However, due to the difference in materials and ages of the new and old concrete, under certain circumstances, its drying shrinkage deformation and temperature deformation are difficult. Coordinated, tensile stress and shear stress are generated at the...

Claims

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Application Information

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IPC IPC(8): C04B41/50
CPCC04B41/009C04B41/5084C04B28/10
Inventor 程晔李纬华吕中荣徐浩杰古东鹏潘艺何振族张一旸
Owner SUN YAT SEN UNIV
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