Mechanism,and,characteristics, business, insurance Mechanism and characteristics of silicon powder in concrete
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Thus, the general waterconsumption should increase with the silicon powder content increased. But inorder to maintain the same liquidity, while adding silicon powder are generallyrequired to join superplasticizer. To improve the workability in cementconsumption <300 kg/rn2,adding silicon powder can improve its cohesiveness, reduce the secretion ofwater. Because the specific surface area of the silicon powder is very large,many of the free water in the fresh concrete are bound by silicon powderparticles, can greatly reduce the secretion of water. Reducing the accumulationof moisture in the interface, improve the interfacial bonding properties.When larger slump, vibration time isrelatively long, silicon powder concrete is not easy to segregate. Siliconpowder concrete increases the risk of plastic shrinkage cracking, especially inthe higher evaporation rate. Plastic shrinkage cracking can occur in theconcrete pouring until plastering start to solidify, occurs mostly in theconcrete close to the initial setting. In order to prevent the plasticcracking, the concrete must be covered to prevent rapid evaporation surfacecovering the available sacks or plastic film or the curing agent, or use thespray method to reduce evaporation, some can retard evaporation special admixtures,also be used to reduce plastic shrinkage cracking danger.In the case of no superplasticizer also candelay the setting time, especially in case of high content of silicon powder.When adding silicon powder to improve the strength of concrete, the differenceof additives, the setting time is different, and some of them shortening for 1-2h, some did not increase significantly, some delay for 2 h. Reduce the aircontent: due to the specific surface area of the silicon powder is higher, inthe case of the same dose air entraining agent, the gas containing should bereduced, although use superplasticizer will be the same. Silicon powder insteadof cement can reduce the heat of hydration temperature rise.Silicon powder cement show up thermal peak is slightly earlier than cement withoutsilicon powder, but the total heat release below the cement without siliconpowder. Make the grout and aggregate interfacial transition zone improved, andmake pore structure refinement are caused the intensity increased. However, dueto the water consumption increased, to offset part of the strength growth. Afteradding silicon powder, about the silicon powder concrete strength increaseddegree is available to measure by efficiency index. The so-called efficiencyindex is the replacement of cement with silicon powder, the contribution of 1part silicon powder to concrete strength may be equivalent to 2 to 5 timesstrength of cement can be produced, the multiple is called the efficiency indexof the silicon powder. With the silicon powder content increased, its efficiencyindex gradually decreased, when the silicon powder dosage> 20%, theefficiency index was significantly decreased, while > 30%, the strength ofthe concrete may even decline. Therefore, the dosage is usually less than 20%.When silicon powder dosage is too high, the fresh concrete become very viscousincrease the construction pouring difficulty. At the same time, the price of siliconpowder is higher than cement, to meet the design strength of concrete or otherperformance requirements under the premise, with less doped is appropriately, inhigh-performance concrete, the usual dosage is generally between 5%-15%.Silicon powder concrete shrinkage andautogenous shrinkage increased by water-cement ratio reduce. General siliconpowder concrete perform that drying shrinkage increases in early stage and reducein later stage. In order to reduce the early dry shrinkage of silicon powderconcrete, can extend the moist curing time, dubbed the silicon powder slurryagent or incorporated into the appropriate expansion agent and so on.Source:http://www.mhcmp.com Article Tags: Silicon Powder Concrete, Silicon Powder, Powder Concrete
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