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Inorganic adhesive for concrete interface

An inorganic binder and concrete technology, applied in inorganic binders, adhesives, etc., can solve the problems of low bonding strength, reduced durability, interface damage, etc. Effect

Inactive Publication Date: 2002-01-23
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low bonding strength of the interface between new and old concrete, a weak surface is formed, and the new and old concrete cannot form a continuous whole, and it is easy to be damaged along the interface after being stressed, leaving engineering hidden dangers
At present, epoxy-based structural adhesive is usually used to deal with the interface between new and old concrete. Although its strength is high, its water resistance is poor, and its bonding strength is low in a humid environment. , aging and durability problems are more prominent in the environment of ultraviolet radiation, and the linear expansion coefficient difference with concrete is too large, easy to deform and peel off, generally toxic and expensive

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0015] Table 1 to Table 2 are a group (8) of embodiments of the present invention. Table 1 is the chemical composition of the active powdery material; Table 2 is the inorganic binder made by utilizing the different proportions of the raw materials listed in Table 1;

[0016] Table 3 is various examples listed in Table 1 to Table 2. Add an appropriate amount of water according to the mixing ratio of each example (it is suitable for painting, not too thin), and paint on the broken small "8" font mortar specimen and the broken 40×40×160mm mortar specimen section, two End-to-end connection, curing until the age, respectively test the tensile strength and flexural strength;

[0017] Table 4 shows that after the 40×40×160mm mortar specimen is broken, the inorganic binder (mixed with appropriate amount of water) is applied to the section, the two ends are butted, and the curing is until the age. .

[0018] raw material

[0019]

[0020]

[0021] ...

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Abstract

The inorganic concrete interface binder consists of mainly active powder material, cement and surfactant, the active powder material is one or the composite of slag, zeolite powder, flyash, silicon powder and other active material; the surfactant is one or the composite of lignin, naphthalene, resin, molasses, chlorine salt, sulfate and organic amine; and cement used is high strength cement. The binder adheres new and old concrete parts into one integral, and the interface between the new and old concrete parts has tensile strength greater than that of the concrete itself. The binder has the same deformation as concrete, good endurance, easy construction, low cost, no toxicity and other features. It may be used widely in the interface between new and old concrete.

Description

(1) Technical field [0001] The invention belongs to the technical field of civil construction materials, in particular to a new-old concrete interface adhesive used in water conservancy or civil construction engineering. (2) Background technology [0002] In concrete engineering, we often encounter the problem of bonding the interface between old and new concrete. Due to the low bonding strength of the interface between new and old concrete, a weak surface is formed, and the new and old concrete cannot form a continuous whole, and it is easy to be damaged along the interface after being stressed, leaving engineering hidden dangers. At present, epoxy-based structural adhesive is usually used to deal with the interface between new and old concrete. Although its strength is high, its water resistance is poor, and its bonding strength is low in a humid environment. , aging and durability problems are more prominent in the environment of ultraviolet radiation, and the linear exp...

Claims

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Application Information

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IPC IPC(8): C04B28/00C09J1/00
Inventor 曾力吴定燕
Owner WUHAN UNIV
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