Creep and thermal cracking of ultra-high volume fly ash mass concrete at early age. (May 2019)

• Record Type: Journal Article
• Authors: Zhao, Zhifang; Wang, Kejin; Lange, David A.; Zhou, Hougui; Wang, Weilun; Zhu, Dongming
• Is Part Of: Cement & concrete composites. Volume 99(2019)
• Page Start: 191
• Page End: 202
• Publication Date: 2019-05
• Subjects: Ultra-high volume fly ash mass concrete -- Creep -- Thermal cracking -- Early age -- TSTM test; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2019.02.018
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: An experimental study characterized fresh and hardened ultra-high volume fly ash mass concrete (HP-HVFA, with 80% fly ash and a water-to-binder ratio of 0.26) and normal content fly ash mass concrete (NS-FA, with 35% fly ash and a water-to-binder ratio of 0.43). The creep and thermal cracking behaviors of the HP-HVFA and NS-FA concrete were evaluated using a temperature stress testing machine (TSTM). A series of TSTM tests were conducted under an adiabatic curing mode and a temperature matched curing (TMC) mode. The results indicate that HP-HVFA concrete had moderate strength at early age and desirable fresh and hardened engineering properties. Under the both curing modes studied, HP-HVFA exhibited lower hydration temperature rise. Under the TMC mode, both compressive and tensile creep of HP-HVFA were lower than that of NS-FA although their specific creep and creep-to-shrinkage strain ratio at time of cracking were almost the same. Under adiabatic mode, HP-HVFA had higher creep strain, specific creep, and creep-to-shrinkage strain ratio than NS-FA.