Since EPS lightweight aggregate manufactured by resin that the absorption rate and the density different from the lightweight aggregate of inorganic is very low between 15~30kg/㎥, EPS lightweight aggregate might be used by the structure and celotex concrete according to the combination method. Howev...
Since EPS lightweight aggregate manufactured by resin that the absorption rate and the density different from the lightweight aggregate of inorganic is very low between 15~30kg/㎥, EPS lightweight aggregate might be used by the structure and celotex concrete according to the combination method. However, EPS lightweight aggregate is mainly used for celotex concrete because there are some problems of the mixture by the material separation of aggregate. According to the development of method to solve the problems of mixture by the material segregation of EPS lightweight aggregate and to do the coating of surface, the analysis about the overall revelation performance of concrete used for coating of EPS lightweight aggregate is necessary. Therefore, this study is to analyze the general function of concrete used for coating of EPS lightweight aggregate and to analyze the basic characteristics of dynamic characteristics and slump by the combination of lightweight aggregate; also, it is to confirm the application possibility of structure and celotex concrete. This study offers the basic material for the utilization of EPS lightweight aggregate concrete by suggesting and evaluating the principal performance required by the structure and celotex lightweight aggregate concrete besides dynamic characteristics. First of all, to analyze the characteristics of lightweight aggregate concrete used for coating EPS, this study examines the prior study of EPS lightweight aggregate concrete. After collecting the necessary theoretical ground for this study, this research analyzes the physical characteristics of coating EPS lightweight aggregate and designs the combination of concrete. According to the mix rate of coating EPS, the study analyzes dynamic characteristics and curing methods such as slump, slump flow, unit weight, compression strength, tensile strength, and bending strength that have an effect on the strength enhancement and the deformation characteristics on high temperature heating as whole range. Also to evaluate the use characteristics regarding the mix range of structural coating EPS lightweight aggregate concrete, this research measures the deformation characteristics by the repetition of freezing and thawing for the material segregation degree that is the frailty of EPS lightweight aggregate and also measures the drying shrinkage by the process of material age in cold temperature. And after measuring the heat conductivity regarding the mix range of EPS lightweight aggregate concrete for celotex coating, this research suggests the optimum mix of EPS lightweight aggregate concrete for structure and adiabatic coating overall. We come to the conclusion that: 1) Slump and slump flow decrease when the replacement rate of EPS increases, and slump and slump flow show rapid reduction more than 50% at the alternative curve about total volume. The amount of air shows the range between 2.2~10%, and it increases when W/C is getting smaller. Also the amount of air increases when the replacement rate of EPS and the amount of sand increase. 2) The unit weight and oven dry weight is respectively the range between 0.27 ~1.76t/㎥, 0.2~1.65t/㎥. The unit weight and oven dry weight decrease by 0.2t/m3 when the replacement rate of EPS increases 10%, by contrast, the unit weight and oven dry weight increase when W/C is getting smaller and the amount of sand interfusion is getting increasing. The compression strength of the material age 28 is the various range of 0.0 9~20.4MPa, and the structure concrete by the distinction of mix combination of usage range shows 40~45% of W/C and 20% of the replacement rate of EPS. The mix combination of adiabatic concrete is more than 45~50% of W/C and 50~80% of the replacement rate of EPS; the mix combination of charging concrete is except that of adiabatic concrete. Also in the case of amount of sand inclusion, the initial strength and strength enhancement have the advantage of EPS by 20~50% but have the disadvantage of EPS between 60~80%. 3) The 0.06~6.21MPa of bending strength is three times stronger than the 0.02~2.16MPa of tensile strength. The relation between tensile strength/compression strength and bending strength/compression strength shows that 40 and 45% of W/C is 1/8 and 1/3 and 50% of W/C is 1/11 and 1/5 respectively except 70~80% of EPS. Also the elastic coefficient might be obtained by the presumption of elastic coefficient that offered by the concrete design criterion of priority and ACI 318. According to the curing method, the strength revelation of compression strength can be diminutively measured by the order of water curing, moisture curing, and atmospheric curing. However, in the case of 70~80% of EPS replacement rate, the strength revelation of atmospheric curing is more excellent than that of water and moisture curing. 4) In the case of high temperature heating, the 20~40% mix combination of EPS replacement rate is expanding, however, 50~80% of EPS replacement rate is decreasing. Also the decrement rate of weight increases when the replacement rate of EPS increases. The compression strength residue rate is measured to 10.4~11.8% by the mix combination of EPS 20~40% and is judged that it has closely relation with the general concrete. The mix combination of EPS which is over 50% cannot be measured because of the destruction of mix combination. 5) The material segregation degree by compaction tends to increase when W/C is getting higher and the replacement rate of EPS is getting lower. The EPS lightweight aggregate of none coating regarding the material segregation rate analyzes lower than that of coating by 27%. The change of amount of air by vibrating compaction increases when the replacement rate of EPS lightweight aggregate increases. In the change of amount of air by vibrating compaction, the EPS lightweight aggregate of coating is larger than that of none coating. It is judged by the effervescence effect of coating, and the amount of air decreases when the time of vibrating compaction increases. 6) The viscosity of cement matrix is measured to 11.5~42dPa·s, and it tends to increase when the inclusion of sand increases. The relation between slump and viscosity of cement matrix decreases averagely by 0.6cm/dPa·s when the viscosity increases, and the material segregation degree is measured low when the viscosity increases. Also the material segregation doesn't happen when the viscosity of cement matrix is over 20dPa·s. It shows that the time of vibrating compaction is increasing when the compression strength is decreasing. Also when the EPS aggregate of coating is used, the material segregation is smaller; the decrement of compression strength and the strength deviation show smaller that is judged to be excellent about the quality security. 7) The shrinkage rate shows the uniform range between 6.12~8.54×10^(-2)(%) from the 70th day of material age, and it is measured to be larger than the average concrete. However, it is judged that the cracking by the low modulus of elasticity never happens due to the decrement of internal stress. The freezing and thawing resistance judges the relative dynamic modulus of elasticity and the length variation rate, and the freezing and thawing resistance of the whole mix combination is excellent except the mix combination of EPS substitution rate 20%. 8) The heat conductivity is 0.079~0.443W/mK when the oven dry weight is 0.29~0.93t/㎥; the thesis for the assumed formula of heat conductivity is possible according to the oven dry weight. As a result of the study, the mix combination that can use as a structural usage is C:S = 1:2, W/C 45%, and the replacement rate of EPS is 20%. The mix combination that can use as a adiabatic usage is C:S = 1:0, W/C 50%, and the replacement rate of EPS substitution rate is 70%.
Since EPS lightweight aggregate manufactured by resin that the absorption rate and the density different from the lightweight aggregate of inorganic is very low between 15~30kg/㎥, EPS lightweight aggregate might be used by the structure and celotex concrete according to the combination method. However, EPS lightweight aggregate is mainly used for celotex concrete because there are some problems of the mixture by the material separation of aggregate. According to the development of method to solve the problems of mixture by the material segregation of EPS lightweight aggregate and to do the coating of surface, the analysis about the overall revelation performance of concrete used for coating of EPS lightweight aggregate is necessary. Therefore, this study is to analyze the general function of concrete used for coating of EPS lightweight aggregate and to analyze the basic characteristics of dynamic characteristics and slump by the combination of lightweight aggregate; also, it is to confirm the application possibility of structure and celotex concrete. This study offers the basic material for the utilization of EPS lightweight aggregate concrete by suggesting and evaluating the principal performance required by the structure and celotex lightweight aggregate concrete besides dynamic characteristics. First of all, to analyze the characteristics of lightweight aggregate concrete used for coating EPS, this study examines the prior study of EPS lightweight aggregate concrete. After collecting the necessary theoretical ground for this study, this research analyzes the physical characteristics of coating EPS lightweight aggregate and designs the combination of concrete. According to the mix rate of coating EPS, the study analyzes dynamic characteristics and curing methods such as slump, slump flow, unit weight, compression strength, tensile strength, and bending strength that have an effect on the strength enhancement and the deformation characteristics on high temperature heating as whole range. Also to evaluate the use characteristics regarding the mix range of structural coating EPS lightweight aggregate concrete, this research measures the deformation characteristics by the repetition of freezing and thawing for the material segregation degree that is the frailty of EPS lightweight aggregate and also measures the drying shrinkage by the process of material age in cold temperature. And after measuring the heat conductivity regarding the mix range of EPS lightweight aggregate concrete for celotex coating, this research suggests the optimum mix of EPS lightweight aggregate concrete for structure and adiabatic coating overall. We come to the conclusion that: 1) Slump and slump flow decrease when the replacement rate of EPS increases, and slump and slump flow show rapid reduction more than 50% at the alternative curve about total volume. The amount of air shows the range between 2.2~10%, and it increases when W/C is getting smaller. Also the amount of air increases when the replacement rate of EPS and the amount of sand increase. 2) The unit weight and oven dry weight is respectively the range between 0.27 ~1.76t/㎥, 0.2~1.65t/㎥. The unit weight and oven dry weight decrease by 0.2t/m3 when the replacement rate of EPS increases 10%, by contrast, the unit weight and oven dry weight increase when W/C is getting smaller and the amount of sand interfusion is getting increasing. The compression strength of the material age 28 is the various range of 0.0 9~20.4MPa, and the structure concrete by the distinction of mix combination of usage range shows 40~45% of W/C and 20% of the replacement rate of EPS. The mix combination of adiabatic concrete is more than 45~50% of W/C and 50~80% of the replacement rate of EPS; the mix combination of charging concrete is except that of adiabatic concrete. Also in the case of amount of sand inclusion, the initial strength and strength enhancement have the advantage of EPS by 20~50% but have the disadvantage of EPS between 60~80%. 3) The 0.06~6.21MPa of bending strength is three times stronger than the 0.02~2.16MPa of tensile strength. The relation between tensile strength/compression strength and bending strength/compression strength shows that 40 and 45% of W/C is 1/8 and 1/3 and 50% of W/C is 1/11 and 1/5 respectively except 70~80% of EPS. Also the elastic coefficient might be obtained by the presumption of elastic coefficient that offered by the concrete design criterion of priority and ACI 318. According to the curing method, the strength revelation of compression strength can be diminutively measured by the order of water curing, moisture curing, and atmospheric curing. However, in the case of 70~80% of EPS replacement rate, the strength revelation of atmospheric curing is more excellent than that of water and moisture curing. 4) In the case of high temperature heating, the 20~40% mix combination of EPS replacement rate is expanding, however, 50~80% of EPS replacement rate is decreasing. Also the decrement rate of weight increases when the replacement rate of EPS increases. The compression strength residue rate is measured to 10.4~11.8% by the mix combination of EPS 20~40% and is judged that it has closely relation with the general concrete. The mix combination of EPS which is over 50% cannot be measured because of the destruction of mix combination. 5) The material segregation degree by compaction tends to increase when W/C is getting higher and the replacement rate of EPS is getting lower. The EPS lightweight aggregate of none coating regarding the material segregation rate analyzes lower than that of coating by 27%. The change of amount of air by vibrating compaction increases when the replacement rate of EPS lightweight aggregate increases. In the change of amount of air by vibrating compaction, the EPS lightweight aggregate of coating is larger than that of none coating. It is judged by the effervescence effect of coating, and the amount of air decreases when the time of vibrating compaction increases. 6) The viscosity of cement matrix is measured to 11.5~42dPa·s, and it tends to increase when the inclusion of sand increases. The relation between slump and viscosity of cement matrix decreases averagely by 0.6cm/dPa·s when the viscosity increases, and the material segregation degree is measured low when the viscosity increases. Also the material segregation doesn't happen when the viscosity of cement matrix is over 20dPa·s. It shows that the time of vibrating compaction is increasing when the compression strength is decreasing. Also when the EPS aggregate of coating is used, the material segregation is smaller; the decrement of compression strength and the strength deviation show smaller that is judged to be excellent about the quality security. 7) The shrinkage rate shows the uniform range between 6.12~8.54×10^(-2)(%) from the 70th day of material age, and it is measured to be larger than the average concrete. However, it is judged that the cracking by the low modulus of elasticity never happens due to the decrement of internal stress. The freezing and thawing resistance judges the relative dynamic modulus of elasticity and the length variation rate, and the freezing and thawing resistance of the whole mix combination is excellent except the mix combination of EPS substitution rate 20%. 8) The heat conductivity is 0.079~0.443W/mK when the oven dry weight is 0.29~0.93t/㎥; the thesis for the assumed formula of heat conductivity is possible according to the oven dry weight. As a result of the study, the mix combination that can use as a structural usage is C:S = 1:2, W/C 45%, and the replacement rate of EPS is 20%. The mix combination that can use as a adiabatic usage is C:S = 1:0, W/C 50%, and the replacement rate of EPS substitution rate is 70%.
주제어
#코팅 발포폴리스티렌비드 코팅EPS 경량골재콘크리트
※ AI-Helper는 부적절한 답변을 할 수 있습니다.