论文部分内容阅读
为系统研究粉煤灰、吸水保水剂(SAP)对喷射混凝土早龄期开裂损伤的影响,以掺入了粉煤灰、SAP的喷射混凝土为研究对象,对喷射混凝土的早龄期开裂损伤进行平板法试验研究。完成了各种试件的早龄期开裂损伤测试,研究了粉煤灰对喷射混凝土以及SAP对掺入20%粉煤灰喷射混凝土的早龄期开裂损伤的改善作用。试验结果表明,掺粉煤灰等量取代10%、20%水泥后,喷射混凝土的早龄期开裂损伤与基准喷射混凝土相比分别减小约7.2%和26.8%。掺0.25%SAP和0.5%SAP可以使20%粉煤灰掺量喷射混凝土的早龄期开裂损伤与基准喷射混凝土相比分别减小约57.9%和66.50%。因此,掺粉煤灰可有效地降低喷射混凝土早龄期开裂损伤,且在掺加粉煤灰的基础上再掺加适量的SAP效果会更佳。
In order to systematically study the effect of fly ash and SAP on crack initiation in early age of shotcrete, fly ash and SAP shotcrete were taken as the research object to study the early age cracking of shotcrete Study on Flat Plate Method. The early age cracking damage test of various specimens was completed and the improvement effect of fly ash on shotcrete and SAP cracking damage at early age was studied. The experimental results show that the early age cracking of shotcrete decreases by about 7.2% and 26.8%, respectively, compared with that of the base shotcrete after the equivalent amount of fly ash is replaced by 10% and 20% cement. Adulteration of 0.25% SAP and 0.5% SAP can reduce the early age cracking damage of 20% fly ash sprayed concrete by about 57.9% and 66.50%, respectively, compared with the benchmark shotcrete. Therefore, mixed with fly ash can effectively reduce the early age of shotcrete cracking damage, and in addition to the fly ash based on the amount of SAP mixed with the effect will be better.