南方科技大学环境科学与工程学院,广东省土壤与地下水污染防控及修复重点实验室;贵州大学资源与环境工程学院;
随着赤泥堆存量不断增加和城市化进程加快，赤泥资源化利用和低碳透水砖开发，成为协同解决2大问题的关键。基于赤泥和透水砖材料基因共性，以赤泥为原料，采用造粒工艺将赤泥制成免烧骨料，结合混料、成型、养护等步骤，成功制备了高强度免烧透水砖。为系统阐明透水砖制备过程中材料性能的影响因素与构效关系，进一步探究了水灰比、目标孔隙率以及发泡剂占比对透水砖性能的影响，发现水灰比和目标孔隙率主要通过改变砖体内部浆料的流动性，以及连通孔隙数量来显著影响砖体的性能。在发泡剂添加量低于4%(质量分数)时，可以有效提升砖体内部的孔隙率，但是过高的添加量会使透水砖的水灰比增大，弱化了发泡剂本身的造孔作用。采用X射线粉末衍射仪、扫描电子显微镜研究透水砖制备过程中的强度形成机理，发现在砖体制备过程中，赤泥以及水泥反应形成了硅酸钙凝胶，可以有效凝结骨料，赋予透水砖强度以及透水性能。本工作体现了“变废为宝”的资源化利用理念，为赤泥的资源化利用与海绵城市建设对高端建材的需求，提供了新的思路和方法。
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基本信息:
DOI：10.14062/j.issn.0454-5648.20240154
中图分类号:X705;TU522.1
引用信息:
[1]金盛垚,娄向阳,胡健等.赤泥基高强度免烧透水砖制备及影响因素与构效机制[J].硅酸盐学报,2024,52(10):3159-3169.DOI:10.14062/j.issn.0454-5648.20240154.
基金信息:
广东省杰出青年基金(2020B1515020022)