CGM high-strength concrete grouting material how to governance the late dry crack?

CGM high-strength grouting governance crack crack because of reinforcing steel bar under the temperature stress and shrinkage stress caused by a very different role. When the temperature changes, steel and concrete is basically a common deformation, the deformation difference is small, the internal stress are also small. But when the shrinkage of concrete, steel bar is not deformation, and prevents the shrinkage deformation of concrete, shrinkage stress in concrete is increased, thus cracks. Concrete is: ( 1) Materials, improper use, such as using slag Portland cement or rapid hardening Portland cement; Or sand and gravel in the silt content is greater than the provisions; Or the use of inferior plus the seam an agent, etc. （ 2) Large dosage of cement, water, slump, or mixed pumping beautiful seam an agent, water reducing beautiful seam an agent, etc. , are more unfavorable factors of concrete shrinkage and dry shrinkage, crack. （ 3) After concrete pouring in the dry state for a long time, the water evaporation and water loss in concrete component that produce contraction. Like the free water in the wool stoma, in a month or so dry evaporation in capillary contraction deformation. If continue to dry, the physical - began to evaporate The combination of chemical adsorption of water, causing the cement fluid loss compression, adsorption contraction and cracks. （ 4) If evaporation and water content in concrete member uneven distribution, form the humidity gradient, cause systole tensile stress, causing cracks. （ 5) Lowest of concrete strength, the tensile strength, compressive strength is 7% ~ 11%. Component in carbonization, comprehensive volume contraction deformation caused by pressure filtration, cooling, and bound by the internal reinforcement and built-in constraints at the ends of the external stress, when the stress exceeds the limit value when the deformation of concrete, cracks. 2. Solution: dry crack, and often overlap and temperature shrinkage crack. When cracks basically stable, select the temperature is low, the grouting method is adopted. 'Li Gong - box 15838304411 - CGM high-strength cement grouting material 'or' - Li Gong - JGN - Resin grouting grout perfusion 'closed processing, into the overall will crack of concrete, restore the original function. For details, please call site.