轻骨料混凝土具有收缩较大和渗透性较差的特性,矿物掺合料的加入可以改善轻骨料混凝土的性能.将偏高岭土(MK)和矿渣(S)以低于25％的总掺量复掺到轻骨料混凝土中,研究复掺掺合料及不同掺量对轻骨料混凝土的力学性能、氯离子扩散系数和干燥收缩的影响.利用XRD、TG、SEM等测试方法,对其影响机理进行探讨.结果表明,复掺10wt％偏高岭土与10wt％矿渣对轻骨料混凝土力学性能和抗氯离子渗透性能有显著的改善;复掺10wt％偏高岭土和15wt％偏高岭土能有效降低轻骨料混凝土干燥收缩.偏高岭土复合矿渣能优化水泥浆体的组成与结构,增强骨料与水泥浆体间的结合,降低界面过渡区的钙硅质量比,从而提高轻骨料混凝土各龄期抗压强度的抗渗性能.
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