Effect of cement types, mineral admixtures, and bottom ash on the curing sensitivity of concrete

• 作 者: Kinaanath Hussain Pongsak Choktaweekarn Warangkana Saengsoy Theerati Srichan Somnuk Tangtermsirikul
• 机 构: School of Civil Engineering and Technology, Sirindhorn International Institute of Technology, Thamma
• 出 处: International Journal of Minerals Metallurgy and Materials
• 发表日期: 2013年01期
• 关键词: concrete curing sensitivity analysis fly ash limestone powder bottom ash

The curing sensitivity of concrete with cement Types 1, 3, and 5 as well as multiple powders consisting of cement, fly ash, and limestone powder was studied. Bottom ash was also used in the study as an internal curing agent and a partial substitution of fine aggregate. The curing sensitivity index was calculated by considering the performances of compressive strength and carbonation depth. Specimens were subjected to two curing conditions: continuously water-cured and continuously air-cured. The results show that cement Type 3 has a lower curing sensitivity, while cement Type 5 increases the curing sensitivity. For the mixes without bottom ash, the use of fly ash increases the curing sensitivity, while limestone powder reduces the curing sensitivity of concrete. The use of bottom ash in concrete reduces the curing sensitivity, especially at a lower mass ratio of water to binder. Concrete with limestone powder, together with bottom ash, is least sensitive to curing. The curing sensitivity calculated from carbonation depth also has a similar tendency as that derived by considering compressive strength. From the test results of compressive strength and curing sensitivity, bottom ash has been proven to be an effective internal curing agent.

The curing sensitivity of concrete with cement Types 1, 3, and 5 as well as multiple powders consisting of cement, fly ash, and limestone powder was studied. Bottom ash was also used in the study as an internal curing agent and a partial substitution of fine aggregate. The results show that cement Type 3 has a lower curing sensitivity while the cement Type 5 increases the curing sensitivity. For the mixes without bottom ash, the use of fly ash increases the curing sensitivity, while limestone powder reduces the curing sensitivity of concrete. The use of bottom ash in concrete reduces the curing sensitivity, especially at a lower mass ratio of water to binder. Concrete with limestone powder, together with bottom ash, least sensitive to curing. The curing sensitivi ty test from carbonation depth also has a similar tendency as that derived by compress compress strength as that derived by considering compressive strength.