日本語フィールド
著者：Afif, F. M., Himeno, T., Usui, H., Sindete, M. J. and Hino, T.題名：Influence of curing time and temperature on strength development of artificial clay with cement-based binder material発表情報：Proceeding of the 21st Southeast Asian Geotechnical Conference and 4th AGSSEA Conference (SEAGC-AGSSEA 2023)キーワード：Accelerated curing method, Strength development, Curing time, Curing temperature, Artificial clay概要：抄録：In the deep mixing method using cement-based binder material, it is extremely important to know whether the strength of the improved soil reaches the required strength at the time of construction. In order to ensure the quality, drill core samples are taken from the improved soil and unconfined compressive strength tests are carried out at least 7 days or 28 days after mixing and placement, which may cause construction work to be delayed. There is obviously a need to accurately predict the strength of improved soil early. The increased temperature was one of the accelerated curing methods. This study attempted to obtain strength development of artificial clay such as kaolin and bentonite mixed with cement within one day cured. To study the effect of time and temperature, the specimens were cured at various curing times of 5 hours, 8 hours, 15 hours, 18 hours, and 21 hours also other specimens were cured in temperature-controlled water baths under various temperatures at 45°, 55°, 65°, and 75° C then performed the unconfined compressive test. The result of the study showed that in both artificial clays with an increase in curing time at temperature-controlled water baths, strength development also increased, and showed an upward trend up to 18 hours, then converged at 21 hours. The unconfined compressive strength ratio (UCSR) at 28 days of curing and time variation curing reached a range of 1-2 as the time approached 21 hours. Kaolin and bentonite exhibited different strength development in terms of temperature variation. In kaolin, the UCSR tended to reach about 1.3 between 65° C and 75° C, meanwhile for bentonite reached 1.4 at 55° to 65° C. For bentonite, it is considered that a stable strength estimation formula can be obtained by performing curing at a temperature of 55° to 65°C.英語フィールド
Author：Afif, F. M., Himeno, T., Usui, H., Sindete, M. J. and Hino, T.Title：Influence of curing time and temperature on strength development of artificial clay with cement-based binder materialAnnouncement information:Proceeding of the 21st Southeast Asian Geotechnical Conference and 4th AGSSEA Conference (SEAGC-AGSSEA 2023)Keyword：Accelerated curing method, Strength development, Curing time, Curing temperature, Artificial clayAn abstract：In the deep mixing method using cement-based binder material, it is extremely important to know whether the strength of the improved soil reaches the required strength at the time of construction. In order to ensure the quality, drill core samples are taken from the improved soil and unconfined compressive strength tests are carried out at least 7 days or 28 days after mixing and placement, which may cause construction work to be delayed. There is obviously a need to accurately predict the strength of improved soil early. The increased temperature was one of the accelerated curing methods. This study attempted to obtain strength development of artificial clay such as kaolin and bentonite mixed with cement within one day cured. To study the effect of time and temperature, the specimens were cured at various curing times of 5 hours, 8 hours, 15 hours, 18 hours, and 21 hours also other specimens were cured in temperature-controlled water baths under various temperatures at 45°, 55°, 65°, and 75° C then performed the unconfined compressive test. The result of the study showed that in both artificial clays with an increase in curing time at temperature-controlled water baths, strength development also increased, and showed an upward trend up to 18 hours, then converged at 21 hours. The unconfined compressive strength ratio (UCSR) at 28 days of curing and time variation curing reached a range of 1-2 as the time approached 21 hours. Kaolin and bentonite exhibited different strength development in terms of temperature variation. In kaolin, the UCSR tended to reach about 1.3 between 65° C and 75° C, meanwhile for bentonite reached 1.4 at 55° to 65° C. For bentonite, it is considered that a stable strength estimation formula can be obtained by performing curing at a temperature of 55° to 65°C.