矿渣-偏高岭土地聚物抗压强度影响因素研究

Study on the influence factors of compressive strength of slag-metakaolin-based geopolymer

为研究矿渣-偏高岭土地聚物抗压强度的影响因素,设计其最佳配合比。本研究以质量比为6∶4的矿渣与偏高岭土混合物为原料,分析了激发剂浓度、模数及液固比对矿渣-偏高岭土地聚物7 d、28 d抗压强度的影响规律。研究结果表明:矿渣-偏高岭土地聚物抗压强度随激发剂浓度的升高而升高,随液固比的升高而降低。在一定范围内随激发剂模数的增加呈先上升后下降的趋势。其中,液固比是影响其强度的主要因素,液固比为0.9时,其达到最大抗压强度76.03 MPa。矿渣-偏高岭土地聚物早期强度较高,28 d强度涨幅较小。

This work aims to investigate the factors to affect the compressive strength and design the optimum formulation of slag-metakaolin-based geopolymer. The 60% slag and 40% metakaolin were used as the raw materials. The effects of alkaline activator concentration modulus and liquid tosolid ratio on the 7 d and 28 d compressive strength of the slag-metakaolin-based geopolymer were nasalized. The results show that the compressive strength of the slag-metakaolin-based geopolymer increases with the increase of the concentration of the activator. That will decrease with the increase of the liquid-solid ratio. In a certain range,the compressive strength of the slag-metakaolin-based geopolymer increases and then decreases with the increase of the activator modulus. Moreover,the liquidto solid ratio plays a key role to affect the strength. When the liquid to solid ratio is 0.9 the maximum compressive strength of 76.03 MPa will be obtained. The slag-metakaolin-based geopolymer exhibited high early strength,whereas the strength of the 28 d aging increases rarely.