Modified epoxy grouting material repair concrete cracks

Modified epoxy grouting material shrinkage of concrete shrinkage and autogenous shrinkage. Is drying shrinkage of concrete with excess water evaporation, the humidity is lower and reduce the shrinkage of volume, the shrinkage of the total shrinkage of large part; Autogenous shrinkage is reduced in volume caused by cement hydration, shrinkage is only 1/5 ~ 1/10 of the former. Cause analysis: (1), because of the influence of temperature variation and concrete shrinkage change form crack; Diction, excessive vibration caused by segregation, the surface of cement content, shrinkage and increase; (3), soon to dismantle or maintenance period by the disturbance factors may cause concrete crack occurred; (4), not enhance the early concrete curing, the surface moisture loss too fast, causing internal and external contraction caused by the uneven surface of concrete cracking. Preventive measures: (1), after pouring the concrete 6 hours start curing, curing age for 7 days, 24 hours every 2 hours before the curing time, according to maintenance every 4 hours after 24 hours, end face covered with wet sacks, avoid exposure; Diction, vibrating close-grained without segregation, to secondary board face pressure, in order to reduce shrinkage; Repair method: for minor cracks can be modified epoxy grouting material to crack down, embedded real re-cover maintenance; Or cracks will be clean, dry brushing twice after epoxy mastic or labeled with epoxy glass cloth surface closed; For deeper or through the crack, after the application of epoxy resin grouting material surface to add brush epoxy resin cement closed.