Modified epoxy resin seepage-prevention and leak-stopping grouting material and method for concrete in arctic-alpine area

Abstract

The invention belongs to the technical field of high molecular fine chemical engineering, and discloses a modified epoxy resin seepage-prevention and leak-stopping grouting material and a modified epoxy resin seepage-prevention and leak-stopping method for concrete in an arctic-alpine area. The modified epoxy resin grouting material is prepared from 40 to 60 parts of modified epoxy resin, 25 to 50 parts of active diluting agent, 10 to 20 parts of curing agent and 2 parts of accelerating agent, and is obtained by mixing the modified epoxy resin, the active diluting agent, the curing agent and the accelerating agent at 0 to 5 DEG C. The modified epoxy resin grouting material is lower in viscosity at a low temperature, good in toughness and good in freezing and thawing resisting cycle performance, is not obviously decreased in mechanical performance after undergoing a freezing-and-thawing cycle for above 50 times, is sufficient in operating time, is appropriate in curing time, has the curing time which is approximately 10h to 15h after the mixing, is guaranteed in use effect through the appropriate curing time, and is good in bonding performance. The adopted grouting material has the wet-base-surface bonding strength which is more than 4MPa and the dry-base-surface bonding strength which is more than 3.5MPa; thus, the use requirement of a project in the arctic-alpine area can be met.

Description

technical field [0001] The invention belongs to the technical field of macromolecule fine chemicals, and relates to a modified epoxy resin anti-seepage and plugging grouting method for concrete in alpine regions. Background technique [0002] Concrete cracks are one of the most common and common diseases in concrete engineering. Our country has a vast territory and a large amount of concrete engineering. Many concrete projects in the 1980s and 1990s have produced cracks of varying degrees, especially in alpine regions. damage, the water leakage phenomenon is more serious. Cracks in concrete may cause its mechanical properties to decline, its service life to be greatly reduced, and it is very easy to cause safety accidents. Once concrete cracks occur, if they are not effectively controlled, the speed at which harmful media intrude into the concrete structure will be greatly accelerated, and the mechanical properties and even durability of the concrete structure will be grad...

AI Technical Summary

Problems solved by technology

However, conventional epoxy resin grouting materials generally solidify slowly and are brittle, and are often only suitable for grouting at room temperature. In alpine regions, due to restrictions on construction conditions, the construction environment and use environment are in low temperature environments. , the conventional epoxy resin grouting material has a slow curing rate, and generally needs to be cured for more than 24 hours at room temperature, which cannot meet the application requirements of engineering in a low temperature environment; while the initial viscosity of the faster curing epoxy resin grouting material is relatively large, Moreover, the viscosity rises rapidly with time, resulting in insufficient construction and operation time, and it is difficult to meet the application requirements

In addition, in the alpine region, due to repeated freeze-thaw cycles, the thermal expansion and contraction are frequent, so the grouting material is required to have good toughness, so as to avoid the deformation caused by the thermal expansion and contraction, which will cause the grouting material to fall off and crack. Or broken, the commonly used epoxy resin grouting material is brittle and difficult to meet the application requirements

Images