Luohe strength non-shrink grout why there is cracking, peeling, sand phenomenon? First, the grouting material "cracking" grout cracks or crevices, usually for the following reasons: (1) Cement urgent condensate, water demand is too large, and so easily cause stability substandard grout "cracking." 2, when the water-cement ratio grout formulation is too small, gray-sand ratio is too large, sand ratio is small, or too many additives, so that the relative lack of grout hydration with water to form a "rigid material", after curing, the concrete internal In the structure of thermal expansion under stress and "cracking." 3, uneven mixing, maintenance errors, can also cause uneven concrete strength, resulting in uneven stress. 4, the use of the aggregate particle size is too large, in the case of water-cement ratio can easily form a large cavity, the water evaporates will have a "crack"; and because the surface of cement grout can not be fully hydrated when the underlying strength after play, the stress is greater than the stress generated by the surface and thus a "cracking." Second, the grout surface "peeling" concrete forming a few days later, a thin layer of the surface was massive shedding, close to the bottom of peeling usually there will be "from the sand" phenomenon. Able to lead "from the sand" factors may have resulted in peeling Also note the following points: 1, Plastering improper operation. Such as plaster premature, plaster too many times, wipe the surface concentration of excessive force or repeated wiping noodles. 2, the effect of temperature. Such as conservation of water is too cold (<10 ℃) or too hot (> 60 ℃), the curing temperature, and grout hydration temperature too much; pouring early in the construction or in case of frost temperature dips, fog dip and so on. Third, the grout surface "from the sand" grout construction is completed, after a period of maintenance (grout cement solidification), we found that the surface layer of concrete does not have strength "from the sand," concrete abrasion resistance, durability, and impermeability will fall. Such phenomena produce the following reasons: (1) Cement quality. Main manifestations of strength is too low, stability failure, setting time is too long, the specific surface area is too small (fine through coarse), particle size distribution over-concentration of alkaline and non-active components in hybrid materials accounted for a disproportionately large share of cement, etc. factors will result in slower coagulation grout hydration, bleeding waterborne larger, resulting in low strength concrete surface. 2, grout ingredients properly. Such as water-cement ratio is relatively large, gray-sand ratio is too small, the rate of sand and fine aggregate content is too high, too much water reducing admixtures and retarders, etc., etc., resulting in low strength concrete. 3, the impact of the other constituent materials. If sand is not clean (mud content is bigger), sand fineness modulus is too high or too low, but also make grout strength decreases secretion of water increases. 4, improper construction grout. Vibrated excessively, causing serious concrete analysis of water; improper secondary plaster or no plaster, plaster too early (not yet reached the initial setting) or too late (after the final setting), plaster and found that more precipitation plus the excess water surface, such as cement fill grout surface may have resulted from the sand. 5, environmental factors. Such as construction higher CO2 concentration in ambient air, and the cement gel Ca (OH) 2 role after hardening its surface alkalinity causes poor; already hardened mortar and grout has not reached a certain intensity often subject to prior exposure, wind, rain, wet and dry cycles, or carbonation and so on. 6, forming improper maintenance. Excessive wet curing, such as hardening of the concrete surface waters before being washed; wet curing deficiencies, within grout evaporation loss; wet curing premature, after forming the initial setting is not reached prematurely watering and so on. Contact: Manager Tian Tel 0533 -6077739 13335235635 Address: Linzi District, Zibo City, Shandong Province Road 25 in Xuan