Fly Ash as a Partial Replacement for Fine Aggregate in Concrete and Its Effect on Compressive Strength under Different Curing Temperatures
Excessive consumption of natural fine aggregates in construction activities has provoked a shortage of them.It also leads to a need for finding sustainable alternative materials for replacement.As one of such materials, fly ash can be used in concrete as a partial fine aggregate replacing material.Current study demonstrates the feasibility of using fly ash as a partial fine aggregate replacing material in concrete and its effect on compressive strength when cured under different curing regimes.Fine aggregate was partially replaced with Class F fly ash at percentages of 20% and 40%.Cement-only mixture and mixtures of which 15% of their cement was replaced with fly ash were studied.The curing methods used in the study were isothermal heat curing at 30℃, 50℃ and 70℃ and one-day accelerated heat curing.Compressive strength was tested at the ages of 1, 3, 7 and 28 days.Test results reveal that using fly ash as a partial fine aggregate replacing material in concrete gives better compressive strength than those concrete when using fly ash as a partial cement replacing material.In general, better compressive strengths at all the tested ages have been resulted from mixtures with fly as a partial fine aggregate replacing material when compared with the control mixture and mixtures with fly ash as a partial cement replacing material.It can also be concluded that high early-age and later-age compressive strength can be achieved by using fly ash as a fine aggregate replacing material together with curing at elevated temperature.
Concrete Fly ash Fine aggregate Compressive strength Heat curing
M.L.C.Surangi P.Julnipitawong S.Tangtermsirikul Y.Ohgi
School of Civil Engineering and Technology, Sirindhorn International Institute of Technology (SIIT), Construction and Maintenance Technology Research Center (CONTEC), School of Civil Engineering and Te Central Research Laboratory, Taiheiyo Cement Corporation, Japan
国际会议
福州
英文
205-212
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）