不同养护方式下粉煤灰基地聚合物抗压强度与凝结时间研究

Study on compressive strength and setting time of fly ash based geopolymerunder different curing methods

为研究养护方式对地聚合物混凝土性能的影响,采用正交试验方法,探究在不同养护方式下矿渣掺量、碱激发剂中Na_2O用量及模数对粉煤灰基地聚合物混凝土抗压强度及凝结时间的影响程度和影响规律。结果表明,同一配合比下不同养护方式对地聚合物混凝土的抗压强度影响程度均呈现高温养护-B>标准养护>高温养护-A的趋势;不同养护温度与条件下各影响因素对抗压强度的影响程度不同,但均在矿渣掺量30%、Na_2O用量11%,模数1.5时抗压强度最高。各影响因素对地聚合物净浆初凝与终凝时间影响程度的顺序相同,均为矿渣掺量>Na_2O用量>模数。

In order to study the influence of curing methods on the performance of geopolymer concrete,the orthogonal test method was used to explore the influence degree and influence law of slag content,alkali activator Na 2O content and modulus on the compressive strength and setting time of fly ash geopolymer concrete under different curing methods.The results show that under the same mix ratio,the compressive strength of geopolymer concrete shows the trend of high temperature curing-B>standard curing>high temperature curing-A;under different curing temperatures and conditions,the influence degree of each influencing factor on the compressive strength is different,but the compressive strength is the highest when the slag content is 30%,the Na 2O content is 11%,and the modulus is 1.5.The order of influence of each influencing factor on the initial setting time and final setting time of geopolymer paste is the same,which is slag content>Na 2O content>modulus.