Anqing, Weihai grouting material - hot weather grouting material pouring 
 Pouring in the hot weather grouting material has some special problems, which is due to the higher temperature of grouting material. Fresh grout material and, in many cases, the evaporation rate due to the increase. These issues related to the grout mixing, pouring and conservation 
 Hot weather pouring grouting material is a not uncommon, is a specialized process; he needs to adopt certain measures to control the environment high temperature grouting material, the Anqing grouting materials, the Weihai grouting material high temperature, relative humidity, high wind speed and high the impact of solar radiation. Or so that is minimized. Need for each project (the existence of one or more of the above conditions) to develop a reasonable construction techniques and procedures, and strictly comply with; consistency is essential, from the easy to establish the norms will have trouble. 
 Higher ambient temperature increase in the grouting material water, fresh grouting material temperature and lead to accelerated slump loss, hydration faster, which leads to the grouting material to accelerate the condensation, but the long-term strength. In addition, rapid evaporation may be caused by plastic shrinkage and cracking, and then hardened grouting material the Anqing grouting material for cooling will produce a tensile stress. Generally believe that will be generated when the evaporation rate is greater than the secretion of water rise to the surface of the rate of plastic shrinkage cracking, but have been observed in a layer of water below the cracks, and under dry conditions became apparent. Hourly evaporation rate is greater than 1.0kg / m prone to cracks in the plastic. 
 Plastic shrinkage cracks may be very deep, the width ranging from 0.1 ~ 3mm, sometimes short, sometimes even up to 1m. Once generated, the on Henan permanent closure. Relative humidity drop will be to promote the generation of such cracks, the cracks because it seems quite complicated. ACI305R-91, under the following temperature and relative humidity combine to produce the possibility of cracks in the plastic is basically the same; 
 41 ° C and 90% relative humidity; 
 35 ° C and 70% relative humidity 
 24 ° C and 30% relative humidity 
 Wind speed to exceed 4.5mls make the situation worse; windshield and visor are beneficial. 
 Fresh grout, the Anqing grout, Weihai, another of the grouting material surface cracks because the settlement be hindered due to uneven settlement caused by, for example, by the large particles aggregate or reinforced hinder. Plastic settlement cracks by using a mixture of dry mix, better compaction, or reduce the concrete pouring rate and other methods to avoid. Plastic settlement cracks may also be generated at room temperature, plastic shrinkage cracks and plastic settlement cracks in the hot weather and sometimes confusing. 
 Pouring grouting material in the hot weather there will be some of the more complex situation: such as air-entraining would be more difficult, although it can be to compensate by using more air entraining agent. A related issue is the relatively cooler grouting material the pouring expansion of Anqing grout, Weihai grouting material at higher temperatures, which air expansion, so that the intensity decreases, for example, pouring the level of plate will be When this happens, but pouring vertical plate will not. Steel formwork to prevent expansion. 
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