Tongling, Weifang grouting material - slump control water-cement ratio is not desirable 
 With the grouting material than the design, in fact, is to identify the four basic materials (cement, water, sand and gravel), the amount of three proportional relationship (the relationship between water and cement in water-cement ratio; the relationship between sand and gravel, sand ratio said; slurry and aggregate, with unit water reaction). During the grouting materials, the Tongling grouting Mix Design should be based on the intensity level and durability requirements, to determine the water-cement ratio, and then according to the size of the structure or member section of the grouting material. Intensive steel, aggregate type and particle size. And the construction mode of operation (mechanical vibration or artificial tamping) and other factors to determine the required slump and unit water consumption, and accordingly determined by experiments. Mixed with the admixture of grouting material, you still should consider the impact of factors of the admixture. This can be seen, the water-cement ratio size is controlled by the grouting material strength and durability requirements, the slump is restricted liquidity needs of the construction operation in the grouting material. 
 Water-cement ratio and slump two functions of different design parameters, there is no necessary link, established co-ordination than the case of non-normal fluctuations of the slump will affect the changes in the water-cement ratio, but not by to draw the conclusions can strictly control the use slump, water-cement ratio "feasible. 
 When the unit water, the same grouting material, Tongling grouting material mixture of fluidity (slump) allows 20mm fluctuations, this is a normal phenomenon. Coarse and fine aggregate are non-homogeneous materials, the slump of the determination to take the mixture can not be exactly the same, and the mixture is non-homogeneous materials, but also the Department of the manual, so the determination of slump the results of some fluctuation is not surprising. Practice has proved that even in the same pot (pan) Determination of the mixture of the two results are not entirely consistent. 
 Previous provisions of slump determination results should take the same pot (pan) the average of two results of the grouting material mixture as a pilot to determine the value, but the difference between the two measured values ??must not exceed 20mm, otherwise the test determination of the void, re-sampling. Existing grouting material mixture performance test methods, which are not specifically regulated, stating only that the slump of the determination of the scope of the gravel maximum size not more than 40mm of grouting material, Tongling grouting material, the slump of not less than 10mm of grouting material mixture, the determination results in millimeters, and accurate to 5 mm. 
 "Ordinary grouting material with certain fluctuation range of design disciplines (JGJ55-2000) recommended the selection of the grouting material water table corresponding to the same unit water consumption is not a fixed a slump, but slump value, such as 1 ~ 3cm, 3 ~ 5cm and 5 ~ 7cm. Construction production units commissioned the testing department to carry out the grouting material, and the Tongling grouting material with the than the design of the request made by the slump value is usually this way. 
 Therefore, the slump within a certain range is normal, then the abnormal fluctuations can not be simple to use slump strict control of water-cement ratio "to solve. The same slump, does not mean that the same water-cement ratio. Different water-cement ratio, can have the same slump. Conversely different contingent. 
 In fact, many diseases can be avoided in the strict control and management during the construction process, grout, Tongling grouting material construction. 
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