| 摘要: |
| 基于石灰激发淤泥中SiO2和Al2O3活性组分以产生胶凝产物的原理，在蒸养条件下制备了免烧淤泥砖.系统研究了不同掺量(质量分数)的粉煤灰(10%～50%)和水泥(5%～20%)对石灰淤泥胶凝体系力学性能的影响规律，并通过压汞法、扫描电镜、X射线衍射仪、超声波分析了免烧淤泥砖的微观结构和早期结构形成过程.结果表明：石灰的最佳掺量为30%；水泥掺量为20%时坯体强度较纯坯体(不掺外掺料)提高约50%；单掺粉煤灰(最佳掺量30%)可显著改善免烧淤泥砖坯体的力学性能、细化孔径，提高坯体密实度. |
| 关键词: 淤泥 免烧 建筑自保温 微观结构 超声波 |
| DOI：10.3969/j.issn.1007 9629.2013.02.021 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51138002)；“十二五”国家科技支撑计划 |
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| Mechanical Properties and Microstructure ofNon calcination Sludge Brick |
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ZHANG Yun sheng, NI Zi wei, LI Guang yan
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Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
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| Abstract: |
| Based on lime simulating active component(SiO2 and Al2O3) of the sludge theory, non calcination sludge brick was prepared in the saturated steam environment. The mechanical properties of lime sludge system with incorporation of fly ash（10%50%） and cement（5%20%） were systematically investigated. Mercury intrusion measurements, scanning electron microscopy, X ray diffraction and ultrasonic pulse velocities were also used to measure the characteristic and evolution of microstructure. The experimental results show that the strength of brick with 30 % lime and 20% cement increases by 50% than the one of pure brick. In addition, brick with 30% fly ash improves the mechanic properties, and reduces pore size and porosity. |
| Key words: sludge non calcination building insulation microstructure ultrasonic |
