Prismatic geopolymeric recycled aggregate concrete(GRAC)specimens with a height-to-width ratio of 3 were prepared for the quasi-static compressive test.The specimens were designed with four different widths(70 mm,100 mm,150 mm,and 200 mm)and five distinct RCA replacement rates(0％,30％,50％,70％,and 100％)to explore the influence of specimen size and recycled coarse aggregate(RCA)substitute rate on the compressive strength dispersion of GRAC.A predictive formula for the average compressive strength of different sizes of GRAC,con-sidering the RCA substitute rate,was proposed based on the classical size effect law.The results showed that the compressive strength disper-sion of GRAC decreased with an increase of specimen width.Furthermore,it was observed that the compressive strength dispersion of GRAC ini-tially increased and then decreased as the RCA substitute rate increased.Additionally,a predictive formula for the compressive strength of GRAC with varying sizes and different RCA substitute rates,considering arbitrary reliability levels,was proposed based on the Weibull distribution model.
维普
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