Lightweight Foamed Concrete is concrete cured by mixing cells created in advance with cement slurry and has good characteristics in insulation, soundproof, economical efficiency, lightweight and easiness of construction. Therefore, it is building material with high utility. It is used as ondol floor...
Lightweight Foamed Concrete is concrete cured by mixing cells created in advance with cement slurry and has good characteristics in insulation, soundproof, economical efficiency, lightweight and easiness of construction. Therefore, it is building material with high utility. It is used as ondol flooring, filler and packing material for soft ground and currently is used as ALC block, armored panel and ondol flooring mainly in Korea. But the existing lightweight Foamed concrete has problems as cubical reduction by foam, a lack of intensity revelation, excessive crack, high absorption ratio and permeability which are caused by low-level knowledge and technology about production and construction of lightweight Foamed concrete. Therefore, the purpose of the study is to examine about lightweight Foamed concrete’s characteristics in the event of using additive to settle problems as the above-mentioned cubical reduction by foam, a lack of intensity revelation and more of lightweight Foamed concrete. The study made progress of experiments with total eight series in an experimental plan. The study selected the optimum additive through the series 1 and 2 and selected the optimum added stability agent through the series 3 and 4. In the series 5, the study induced the optimum mixing rate through an experiment to change mixing rate of the optimum additive and added stability agent by experiments until the series 4. In the series 6 and 7, the study made progress of an experiment through mixing of micro particle for economic efficiency and made progress of an experiment through mixingof plasticizer to secure liquidity reduced by each kind of pulverized material. In the series 8, the study proposed data of mix proportion to place high-quality lightweight cells suitable to each situation in the placing field of each kind of lightweight Foamed concrete, inducing various mix proportion of lightweight Foamed concrete by changing unit volume mass and W/B. Summarizing the results of the experiment, they were as follows. 1) Plasticizer’s use is required to secure liquidity reduced by mixing of each kind of pulverized material in inducing the optimum mix proportion through experiments until the series 6 and so made mixing of plasticizer. As the result, liquidity was increased according to increase of mixingamount and it showed that it approached 240mm, a flow value with good constructability on the spot when making mixing of plasticizer until the maximum 0.1%. 2) Foamed ratio was somewhat increased according to replacementratio of additive excepting FA and CKD was increased and unit volume mass was reduced by an effect of Foamed ratio. Added stability agent hardly had a lowering of Foamed ratio in the event of MC and PS, but, in the event of PEO, it was analyzed that it was inadequate to apply it to lightweight Foamed concrete since Foamed group was reduced more than 10% in the process of mixing. 3) In subsidence depth by each kind of additive, SF replacement had the largest subsidence of 110mm in depth and 20% replacement of BS and CKD displayed the best effect by having smaller subsidence in depth than OPC. At the time of using CKD with PS, it showed that it had a gradual reduction in depth of subsidence according to increase of replacement ratio. At the time of mixing CKD 25% with PS 0.03%, it showed that it had a good effect of reduction in depth of subsidence. Also, in mixing rateof plasticizer, it showed that 0.05 % mixing rate of plasticizer had the best effect of reduction in depth of subsidence. 4) It showed that kind of additive and compressive strength by each replacement ratio exceeded thestandard scope of KS by each age in all levels excepting SF. Above all, in the event of BS and CKD, itshowed that 10% replacement had the most stable revelation of compressive strength, but replacement of more than CKD 25% had a lowering of compressive strength. Also, in the event of added stability agent, it showed that it did not a large difference according to changing kind and mixing rate and that it had the best compressive strength at the time of FG mixing rate 10%. It showed that compressive strength followed by mixture of plasticizer satisfied ‘0.5 in weight’ of KS 5) Outward density followed by kind and replacement ratio of additive satisfied 0.4~0.5, 0.5 of KS in all mix proportions thought it had a few differences in degree excepting SF replacement 20%. Its thermal conductivity satisfied ‘Less than 0.5 - 0.160W/(m. k)’in a scope of KS at the timeof CKD replacement 10% and 20% and so it showed that it had the best thermal conductivity. Outward density of added stability agent by each kind and mixing rate had an increasing tendency a little according to increase of mixing rate, having nothing to do with its kind. It showed that its thermal conductivity satisfied a scope of KS in all levels. Outward density followed by change of mixing rate of FG. LSP and plasticizer satisfied ‘0.5’ of KS. 6) Change rate in length of drying shrinkage was reduced according to replacement of additive was increased and it showed that until replacement 20% had a good effect on reducing change rate in length of drying shrinkage. However, it was analyzed that replacement of more than 25% was increased more than OPC in change rate in length of drying shrinkage. In use of added stability agent, it showed that it had change rate in length of drying shrinkage in order of MC, EC, PEO and PS and it was analyzed that drying shrinkage was reduced for the most part at the time of mixing MC. When synthesizing the above, inducing the optimum mix proportion to improve quality of lightweight Foamed concrete by analyzing characteristics of reinforced concrete and lightweight concrete, it is judged that mix proportion putting emphasis onliquidity considering constructability, reducing depth of subsidence which is the largest problem of lightweight Foamed concrete and economical efficiency in the side of price as well a
Lightweight Foamed Concrete is concrete cured by mixing cells created in advance with cement slurry and has good characteristics in insulation, soundproof, economical efficiency, lightweight and easiness of construction. Therefore, it is building material with high utility. It is used as ondol flooring, filler and packing material for soft ground and currently is used as ALC block, armored panel and ondol flooring mainly in Korea. But the existing lightweight Foamed concrete has problems as cubical reduction by foam, a lack of intensity revelation, excessive crack, high absorption ratio and permeability which are caused by low-level knowledge and technology about production and construction of lightweight Foamed concrete. Therefore, the purpose of the study is to examine about lightweight Foamed concrete’s characteristics in the event of using additive to settle problems as the above-mentioned cubical reduction by foam, a lack of intensity revelation and more of lightweight Foamed concrete. The study made progress of experiments with total eight series in an experimental plan. The study selected the optimum additive through the series 1 and 2 and selected the optimum added stability agent through the series 3 and 4. In the series 5, the study induced the optimum mixing rate through an experiment to change mixing rate of the optimum additive and added stability agent by experiments until the series 4. In the series 6 and 7, the study made progress of an experiment through mixing of micro particle for economic efficiency and made progress of an experiment through mixingof plasticizer to secure liquidity reduced by each kind of pulverized material. In the series 8, the study proposed data of mix proportion to place high-quality lightweight cells suitable to each situation in the placing field of each kind of lightweight Foamed concrete, inducing various mix proportion of lightweight Foamed concrete by changing unit volume mass and W/B. Summarizing the results of the experiment, they were as follows. 1) Plasticizer’s use is required to secure liquidity reduced by mixing of each kind of pulverized material in inducing the optimum mix proportion through experiments until the series 6 and so made mixing of plasticizer. As the result, liquidity was increased according to increase of mixingamount and it showed that it approached 240mm, a flow value with good constructability on the spot when making mixing of plasticizer until the maximum 0.1%. 2) Foamed ratio was somewhat increased according to replacementratio of additive excepting FA and CKD was increased and unit volume mass was reduced by an effect of Foamed ratio. Added stability agent hardly had a lowering of Foamed ratio in the event of MC and PS, but, in the event of PEO, it was analyzed that it was inadequate to apply it to lightweight Foamed concrete since Foamed group was reduced more than 10% in the process of mixing. 3) In subsidence depth by each kind of additive, SF replacement had the largest subsidence of 110mm in depth and 20% replacement of BS and CKD displayed the best effect by having smaller subsidence in depth than OPC. At the time of using CKD with PS, it showed that it had a gradual reduction in depth of subsidence according to increase of replacement ratio. At the time of mixing CKD 25% with PS 0.03%, it showed that it had a good effect of reduction in depth of subsidence. Also, in mixing rateof plasticizer, it showed that 0.05 % mixing rate of plasticizer had the best effect of reduction in depth of subsidence. 4) It showed that kind of additive and compressive strength by each replacement ratio exceeded thestandard scope of KS by each age in all levels excepting SF. Above all, in the event of BS and CKD, itshowed that 10% replacement had the most stable revelation of compressive strength, but replacement of more than CKD 25% had a lowering of compressive strength. Also, in the event of added stability agent, it showed that it did not a large difference according to changing kind and mixing rate and that it had the best compressive strength at the time of FG mixing rate 10%. It showed that compressive strength followed by mixture of plasticizer satisfied ‘0.5 in weight’ of KS 5) Outward density followed by kind and replacement ratio of additive satisfied 0.4~0.5, 0.5 of KS in all mix proportions thought it had a few differences in degree excepting SF replacement 20%. Its thermal conductivity satisfied ‘Less than 0.5 - 0.160W/(m. k)’in a scope of KS at the timeof CKD replacement 10% and 20% and so it showed that it had the best thermal conductivity. Outward density of added stability agent by each kind and mixing rate had an increasing tendency a little according to increase of mixing rate, having nothing to do with its kind. It showed that its thermal conductivity satisfied a scope of KS in all levels. Outward density followed by change of mixing rate of FG. LSP and plasticizer satisfied ‘0.5’ of KS. 6) Change rate in length of drying shrinkage was reduced according to replacement of additive was increased and it showed that until replacement 20% had a good effect on reducing change rate in length of drying shrinkage. However, it was analyzed that replacement of more than 25% was increased more than OPC in change rate in length of drying shrinkage. In use of added stability agent, it showed that it had change rate in length of drying shrinkage in order of MC, EC, PEO and PS and it was analyzed that drying shrinkage was reduced for the most part at the time of mixing MC. When synthesizing the above, inducing the optimum mix proportion to improve quality of lightweight Foamed concrete by analyzing characteristics of reinforced concrete and lightweight concrete, it is judged that mix proportion putting emphasis onliquidity considering constructability, reducing depth of subsidence which is the largest problem of lightweight Foamed concrete and economical efficiency in the side of price as well a
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