改性水硬性石灰基材料的制备与性能研究

关键字：水硬性石灰,强度,矿粉,外加剂

（1.北京工业大学城市与工程安全减灾教育部重点实验室，工程抗震与结构诊治北京市重点实验室，北京  100124；2.北京国文琰文化遗产保护中心有限公司，北京  100020）

    摘要：水硬性石灰作为一种传统的硅酸盐建筑材料，广泛应用于历史建筑文物的修复中。研究了矿粉及其它外加剂改性的水硬性石灰的配合比优化设计方法、物理力学性能、水化硬化机理。研究表明：掺加4种外加剂（黏性助剂、粘结助剂、触变助剂、抗裂助剂）及亚硝酸钙能够提高试样的抗折强度，对抗压强度提升作用有限；当磨细矿粉作为掺合料复合石灰后，抗压强度显著提高，综合抗压和抗折强度，最优配合比为60%石灰+40%矿粉+0.8%四种外加剂+2.0%亚硝酸钙，此时，抗折和抗压强度分别为1.44、13.90 MPa。
    关键词：水硬性石灰；强度；矿粉；外加剂
    中图分类号：TU526；TQ177.2        文献标识码：A        文章编号：1001-702X（2017）02-0073-04

Study on preparation and properties of modified hydraulic lime-based material
LI Yue1，YU Pengchao1，WANG Qi2，ZHANG Rong2
（1.The Key Laboratory of Urban Security and Disaster Engineering，MOE，Beijing Key Lab of Earthquake Engineering and Structural Retrofit，Beijing University of Technology，Beijing 100124，China；2.Beijing Guowenyan Cultural Heritage Conservation Center Co. Ltd.，Beijing 100020，China）

    Abstract：As a kind of traditional silicate building material，hydraulic lime is widely used in the restoration of historic buildings of cultural relics. This paper studies the mineral powder and other admixtures modifying hydraulic lime mixture proportion optimization design method，physical and mechanical properties，mechanism of hydration hardening. The researches show that：adding four additives（viscous agent，binder，thixotropic agent，anti-cracking agent） and calcium nitrite can improve the samples' flexural strength，but the compressive strength of ascension role is limited. However，when the mineral powder was used as admixture compound lime，compressive strength improved significantly. Combining compressive strength and flexural strength，the flexural strength and compressive strength can reach 1.44 MPa and 13.90 MPa when adopted optimal mixture proportion of 60% lime，40% mineral powder，0.8% four additives，and 2.0% calcium nitrite.
    Key words：hydraulic lime，strength，mineral powder，admixtures