ผลกระทบของความละเอียดของผงแคลเซียมคาร์บอเนตต่อสมบัติเชิงกล ของคอนกรีตชนิดอัดแน่นได้ด้วยตัวเองผสมเถ้าลอยตกเกรด

Abstract

This paper presented the results of the effect of the fineness of calcium carbonate powder (CCP) on the mechanical properties of self-compacting concrete (SCC) mixed with off-specification pulverized fuel ash (OsPFA) and calcium carbonate powder (CCP). CCP with having fineness by representing as mean particle sizes (D_[v,50]) equal to 2, 8 and 15 micrometers (μm) was taking into account by replacing in Type 1 Portland cement (OPC) of the percentages replacement of 0%, 5%, 10% and 20% by weight blended with the OsPFA replacement ratios of 10%, 20%, 25% and 30% by weight of OPC. The basic properties of the materials consisted of chemical composition and physical properties. Mechanical properties included the compressive and splitting tensile strengths and modulus of elasticity. Results showed that of the compressive strengths of early age SCC containing CCP are higher tendency than those of conventional SCC. In addition the calcium carbonate powder-OsPFA SCC are also higher long-term compressive strength than that of the conventional SCC. Further splitting tensile strength and the modulus of elasticity of SCC containing OsPFA and CCP had a similar tendency to theirs compressive strength. In summary the particle size of CCP directly affected on mechanical properties, which high CCP particle size was higher mechanical properties than that of low CCP particle size.