再生淤泥砖的力学性能及其影响因素分析

关键字：再生淤泥,正交试验,力学性能,微观结构

（1.贵州理工学院 土木工程学院，贵州 贵阳  550003；2.汕头大学 土木工程系，广东 汕头  515063）

    摘要：研究了水灰比、泥灰比、石灰掺量及陶粒掺量对再生淤泥砖物理力学性能的影响。通过4因素3水平正交试验进行了再生淤泥砖的配合比组合设计，分析了各因素对再生淤泥砖性能的影响规律以及各水平间的差异关系。结果表明：泥灰比是影响再生淤泥砖强度和耐水性能最主要的因素，也是最显著因素，其最佳比例为3∶1。采用扫描电镜、X射线衍射方法对再生淤泥砖内部微观结构进行分析，结果显示，淤泥质中含有大量的活性SiO2、Al2O3组分，这些组分在碱性条件下能激发内部活性，生成具有一定粘结强度的胶凝产物，从而对再生淤泥砖的力学性能起到提升作用。
    关键词：再生淤泥砖；正交试验；力学性能；微观结构
    中图分类号: TU522.1          文献标志码：A          文章编号：1001-702X（2017）02-0044-05

Analysis of mechanical properties of recycled aggregate sludge bricks and its influencing factors
FAN Jie1，2，LI Gengying2
（1.School of Civil Engineering，Guizhou Institute of Technology，Guiyang 550003，China；
2.Department of Civil Engineering，Shantou University，Shantou 515063，China）

    Abstract：The influence of different experimental factor，which includes water-cement ratio， sludge-cement ratio，lime content and ceramsite content，on the physical and mechanical performance of recycled aggregate sludge bricks was studied. An orthogonal experimental design method involving four factors and three factor levels is adopted for the mix design of recycled aggregate sludge bricks，the effect of each factor level on mix proportion of recycled aggregate sludge bricks and the difference between each factor levels are analyzed. The experimental results indicate that sludge-cement ratio is the most principal and significant influencing factor on the strength of recycled aggregate sludge bricks and hydrolytic resistance，the optimum sludge-cement ratio is 3∶1. Scanning electron microscope and X-ray diffraction were used to analyze the microstructure of recycled aggregate sludge bricks，and the results show that sludge contains large amount of reactive SiO2 and Al2O3，it can motivate internal activity under the condition of alkaline and convert to cementing material which has a certain bonding strength，so as to improve the mechanical properties of the recycled sludge brick.
    Key words：recycled aggregate sludge bricks，orthogonal test，mechanical properties，microstructure