New/old cement concrete interfacial binding agent and construction method for interfacial binding by using same

Abstract

The invention discloses a new / old cement concrete interfacial binding agent and a construction method for interfacial binding by using the same. The new / old cement concrete interfacial binding agent is divided into a pre-coating agent and a mortar binding agent, wherein the pre-coating agent is prepared from 1 part by weight of carboxybutylbenzene emulsion and 0-5 parts by weight of water; and the mortar binding agent is prepared from 1 part by weight of cement, 0.1-1 part by weight of carboxybutylbenzene emulsion, 0-3 parts by weight of sand and 0-0.3 part by weight of water. The construction method for interfacial binding by using the interfacial binding agent comprises the following steps: brushing or spraying the pre-coating agent on the surface of old cement concrete to form a pre-coating; after the surface of the pre-coating becomes dry, brushing the mortar binding agent on the surface of the pre-coating to form a mortar binding layer; and after the surface of the mortar bindinglayer becomes dry and before the cement in the mortar binding layer initially sets, casting new cement concrete which is bound with the old cement concrete. The invention obviously enhances the binding strength between new cement concrete and old cement concrete, is innoxious and harmless, and is convenient for use and construction.

Description

technical field [0001] The invention relates to a new-old cement concrete interface adhesive and a construction method using the adhesive for interface bonding. Background technique [0002] Highway cement concrete pavement has many advantages such as high strength, water damage resistance, stable performance, low daily maintenance cost, long service life, saving driving fuel consumption, etc., and has broad development and application prospects. But for the subsidence section of road cement concrete pavement, the repair method in the past is: first all excavate the concrete pavement of the subsidence section, fill up the subsidence part on the base, and then relay the new cement concrete pavement. Obviously, this requires a long construction period, seriously affects the normal operation of the road, and wastes resources. The waste cement and concrete blocks need to be piled up in another place, occupying valuable ground space and causing secondary pollution to the environm...

AI Technical Summary

Problems solved by technology

[0006] However, the bonding effect of these adhesives on old and new cement concrete is often unsatisfactory, especially the bonding effect of cement-based adhesives is very poor.

From the current point of view, only solvent-based epoxy resins that do not use cement have a slightly better bonding effect, but solvent-based epoxy resins are highly toxic, harming the health of direct operators, and endangering the environment, polluting air and ground water. In addition, solvent-based epoxy resins Oxygen resin is generally two-component, and it is not easy to mix evenly when used on site, which affects the use effect. After mixing, the safe use period is only half an hour, which brings great inconvenience to the actual construction.

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