Thus,the general water consumption to be increased with the silicon power contentincreased. But in order to maintain the same liquidity while adding siliconpower are generally required to add superplasticizer.
Improve the workability, under thecircumstances of concrete water-cement ratio [W / (C + SF)] is lower, adding silicon power to increasethe cohesiveness. In order to get the same workability with the concrete notadd silicon power, generally need to increase 50mm slump, but in the cases of the cement consumptionis less than 300kg/ m 3, silicon power can improve its cohesiveness.
Reduce bleeding and segregation, because ofthe very high specific surface area of silicon power, manyof the free water in the fresh concrete silicon power particles are bound, cangreatly reduce the secretion of water. Silicon power can improve theperformance of concrete segregation. When larger slump, vibration time isrelatively long, silicon power concrete segregation is not easy.
Plastic shrinkage, plastic shrinkagecracking of concrete is because of the concrete surface tensile stress exceedsthe early tensile strength of concrete. Such tensile stress is caused bymoisture movement of the concrete surface. When the silicon power concretesignificantly reduce the secretion of water, the risk of plastic shrinkagecracking is increased, especially in the high evaporation rate (for example, inthe case of high wind, low humidity and high temperature). Plastic shrinkagecracking can occur after pouring. Plastering until the concrete begins tosolidify, occurs mostly in the concrete close to the initial setting. In orderto prevent the plastic cracking, the concrete must be covered to prevent therapid evaporation of the surface covering the available sacks or plastic filmor the curing agent, or to reduce evaporation in the spray method, can retardevaporation, some special admixtures also used to reduce the plasticity dangerof cracking in many countries.
Setting time, the setting time of the siliconpower concrete compared to the same strength concrete which not add siliconpower often have a slight increase. In the case of no superplasticizer may bedelayed, especially in case of high content of silicon power. When add siliconpower to improve strength, depending on the variety of additives have differenteffects on setting time, some shortening 1to 2h, and some did not increasesignificantly, and some delay 1 to 2h. As the silicon power is higher than thesurface area, under the circumstances of the same dose of the cited case of thegas generating agent, the containing gas is reduce, despite the use ofsuperplasticizer.
Reduce the heat of hydration and temperaturerise, use cement replace of silicon power can reduce the temperature rise and theheat of hydration. Metal powder supplier once had tested siliconpower substitution is 0, 10%, 30% of the cement hydration heat. Heat peaks areslightly earlier than doped silicon power cement, but the total heat releaseare below not add silicon power, seven days total heat release in thesubstitution is 10% and 30%, respectively, decreased by 29% and 19 %. Theamount of cement is 540kg/ m 3 and 10% silicon power replace of cement with high strength concrete, theadiabatic temperature rise can doped 9% than not added.
Article Tags: Silicon Power Concrete, Plastic Shrinkage Cracking, Enviromental Protection Equipment Company Values Silicon Power, Power Concrete, Plastic Shrinkage, Shrinkage Cracking, Setting Time, Temperature Rise
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Improve the workability, under thecircumstances of concrete water-cement ratio [W / (C + SF)] is lower, adding silicon power to increasethe cohesiveness. In order to get the same workability with the concrete notadd silicon power, generally need to increase 50mm slump, but in the cases of the cement consumptionis less than 300kg/ m 3, silicon power can improve its cohesiveness.
Reduce bleeding and segregation, because ofthe very high specific surface area of silicon power, manyof the free water in the fresh concrete silicon power particles are bound, cangreatly reduce the secretion of water. Silicon power can improve theperformance of concrete segregation. When larger slump, vibration time isrelatively long, silicon power concrete segregation is not easy.
Plastic shrinkage, plastic shrinkagecracking of concrete is because of the concrete surface tensile stress exceedsthe early tensile strength of concrete. Such tensile stress is caused bymoisture movement of the concrete surface. When the silicon power concretesignificantly reduce the secretion of water, the risk of plastic shrinkagecracking is increased, especially in the high evaporation rate (for example, inthe case of high wind, low humidity and high temperature). Plastic shrinkagecracking can occur after pouring. Plastering until the concrete begins tosolidify, occurs mostly in the concrete close to the initial setting. In orderto prevent the plastic cracking, the concrete must be covered to prevent therapid evaporation of the surface covering the available sacks or plastic filmor the curing agent, or to reduce evaporation in the spray method, can retardevaporation, some special admixtures also used to reduce the plasticity dangerof cracking in many countries.
Setting time, the setting time of the siliconpower concrete compared to the same strength concrete which not add siliconpower often have a slight increase. In the case of no superplasticizer may bedelayed, especially in case of high content of silicon power. When add siliconpower to improve strength, depending on the variety of additives have differenteffects on setting time, some shortening 1to 2h, and some did not increasesignificantly, and some delay 1 to 2h. As the silicon power is higher than thesurface area, under the circumstances of the same dose of the cited case of thegas generating agent, the containing gas is reduce, despite the use ofsuperplasticizer.
Reduce the heat of hydration and temperaturerise, use cement replace of silicon power can reduce the temperature rise and theheat of hydration. Metal powder supplier once had tested siliconpower substitution is 0, 10%, 30% of the cement hydration heat. Heat peaks areslightly earlier than doped silicon power cement, but the total heat releaseare below not add silicon power, seven days total heat release in thesubstitution is 10% and 30%, respectively, decreased by 29% and 19 %. Theamount of cement is 540kg/ m 3 and 10% silicon power replace of cement with high strength concrete, theadiabatic temperature rise can doped 9% than not added.
Article Tags: Silicon Power Concrete, Plastic Shrinkage Cracking, Enviromental Protection Equipment Company Values Silicon Power, Power Concrete, Plastic Shrinkage, Shrinkage Cracking, Setting Time, Temperature Rise
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