固定水胶比为0.24,通过I级粉煤灰替代砂浆中30%~70%水泥的强度试验,研究了Na 2 SO 4对粉煤灰-水泥砂浆体系的激发效果。结果表明:不掺激发剂时,砂浆抗压和抗折强度随粉煤灰替代率的增加成比例下降,且粉煤灰替代率达50%以上时对强度增长...固定水胶比为0.24,通过I级粉煤灰替代砂浆中30%~70%水泥的强度试验,研究了Na 2 SO 4对粉煤灰-水泥砂浆体系的激发效果。结果表明:不掺激发剂时,砂浆抗压和抗折强度随粉煤灰替代率的增加成比例下降,且粉煤灰替代率达50%以上时对强度增长速率有显著提升作用。粉煤灰替代率不低于50%时,1%的Na 2 SO 4掺量对砂浆抗压强度增进效果最佳,与此不同的是,Na 2 SO 4掺量越高,对砂浆抗折强度的增长越有利。随龄期增长,Na 2 SO 4激发粉煤灰-水泥砂浆的折压比显著下降,但抗折强度均在5.0 MPa以上。展开更多
The fly ash based geopolymer has emerged as a capable and sustainable binder material in construction industry.Ultrasonic pulse velocity(UPV)method is a non-destructive technique for investigating the mechanical perfo...The fly ash based geopolymer has emerged as a capable and sustainable binder material in construction industry.Ultrasonic pulse velocity(UPV)method is a non-destructive technique for investigating the mechanical performance of concrete.Experimental investigation was performed for studying the effect of NaOH Molarity,Na2SiO3/NaOH and curing temperature on the ultrasonic pulse velocity of geopolymer mortar.Experiments were designed based on central composite design(CCD)technique of response surface methodology(RSM).Statistical model was developed and statistically validated and found significant as the difference between adjustable R-squared and predicted R-squared less than 0.2.Finally,the optimized mix proportion was assessed for maximized value of UPV.Experimental validation on the optimized mix reveals the close agreement between experimental and predicted values of UPV with significance level of more than 95%.The proposed technique improves the yield,the reliability of the product and the processes.展开更多
文摘固定水胶比为0.24,通过I级粉煤灰替代砂浆中30%~70%水泥的强度试验,研究了Na 2 SO 4对粉煤灰-水泥砂浆体系的激发效果。结果表明:不掺激发剂时,砂浆抗压和抗折强度随粉煤灰替代率的增加成比例下降,且粉煤灰替代率达50%以上时对强度增长速率有显著提升作用。粉煤灰替代率不低于50%时,1%的Na 2 SO 4掺量对砂浆抗压强度增进效果最佳,与此不同的是,Na 2 SO 4掺量越高,对砂浆抗折强度的增长越有利。随龄期增长,Na 2 SO 4激发粉煤灰-水泥砂浆的折压比显著下降,但抗折强度均在5.0 MPa以上。
文摘The fly ash based geopolymer has emerged as a capable and sustainable binder material in construction industry.Ultrasonic pulse velocity(UPV)method is a non-destructive technique for investigating the mechanical performance of concrete.Experimental investigation was performed for studying the effect of NaOH Molarity,Na2SiO3/NaOH and curing temperature on the ultrasonic pulse velocity of geopolymer mortar.Experiments were designed based on central composite design(CCD)technique of response surface methodology(RSM).Statistical model was developed and statistically validated and found significant as the difference between adjustable R-squared and predicted R-squared less than 0.2.Finally,the optimized mix proportion was assessed for maximized value of UPV.Experimental validation on the optimized mix reveals the close agreement between experimental and predicted values of UPV with significance level of more than 95%.The proposed technique improves the yield,the reliability of the product and the processes.
