EPS颗粒对粉煤灰基碱激发轻质材料性能的影响

Effect of EPS Particles on the Properties of Fly Ash-Based Alkali-Activated Lightweight Materials

为研究聚苯乙烯(EPS)颗粒对粉煤灰基碱激发轻质材料性能的影响,通过单掺EPS颗粒,探究了轻质化后的粉煤灰基碱激发风积沙复合材料的物理性能、抗压强度以及抗冻性能的变化规律。结果表明,EPS颗粒掺量越大,试件的干表观密度和抗压强度的下降速度越快;EPS颗粒掺量为10%~70%时,材料干表观密度在792~1864 kg/m^(3)范围;EPS颗粒掺量提高会使基体中EPS颗粒之间的浆体黏结层变薄,对材料强度不利;100次冻融循环之后,各掺量下复合材料的最大质量损失率和相对动弹性模量分别小于0.4%、大于93%,表明粉煤灰基碱激发风积沙轻质复合材料具有优异的抗冻性能。基于试验数据,建立了不同EPS颗粒掺量下粉煤灰基碱激发轻质复合材料的冻融劣化模型,对预测材料冻融损坏过程具有一定的参考意义。

To study the effect of EPS particles on the performance of fly ash-based alkali-activated lightweight materials,the changes in physical properties,compressive strength,and frost resistance of the lightweight fly ash-based alkali-activated aeolian sand composite material were investigated by adding EPS particles alone.The results show that the larger the amount of EPS particles added,the faster the decrease rate of dry apparent density and compressive strength of the specimen;When the EPS particle content is 10%-70%,the dry apparent density of the material is between 792-1864 kg/m^(3);An increase in the amount of EPS particles will cause the slurry bonding layer between lightweight aggregates in the matrix to become thinner,which is detrimental to the material strength;After 100 freeze-thaw cycles,the maximum mass loss rate and relative dynamic modulus of the composite material at each dosage are less than 0.4%and more than 93%,respectively,indicating that the fly ash-based alkali-activated aeolian sand lightweight composite material has good frost resistance performance.Based on experimental data,a freeze-thaw degradation model for fly ash-based alkaliactivated lightweight composite materials with different EPS particle dosages is established,which has specific reference significance for predicting the freeze-thaw damage process of materials.