污水沉砂的净化处理及其对砂浆性能的影响
Purification treatment of sewage grit sediment and its effect on the performance of mortar
关键词：
洗砂工艺；污水沉砂；砂浆；力学性能；耐久性能；微观结构
Key words：
Sand washing process; Sewage grit sediment; Mortar; Mechanical property; Durability; Microstructure
刊期：
2025年第8期
DOI：
10.19761/j.1000-4637.2025.08.047.06
文章编号：
基金项目：
作者：
丁小波，邓 臻，易 鹏，罗耀明，孙晓辉，刘 伟*
单位：
深圳大学 土木与交通工程学院，广东 深圳 518000
摘要
摘 要：探索了适用于污水沉砂的洗砂工艺，检测了南方某污水处理厂净化沉砂的基本性质，并在此基础上研究了净化沉砂掺量（0、25%、50%、100%）对砂浆力学和耐久性能的影响。结果表明：经洗砂工艺后的净化沉砂表面较光滑，含有较多的贝壳和少量黑色颗粒，细度模数为2.9，矿物组成以石英为主，基本满足混凝土用砂的技术性能要求；随着净化沉砂掺量的增加，砂浆的孔隙率降低，孔径＞50 nm的孔隙占比增大，抗压强度、抗折强度、抗氯离子渗透性能、抗碳化性能基本降低。
Abstract: The washing process applicable to sewage grit sediment from a sewage treatment plant in Southern China was explored, the basic properties of purified grit sediment were tested. Furthermore, the effects of the content(0, 25%, 50%, 100%) of purified grit sediment after sand washing process on the mechanical properties and durability of mortar were investigated. The results show that, the purified grit sediment after sand washing process has smooth surface, contains more shells and a small portion of black particles, the fineness modulus is 2.9, and the mineral composition is dominated by quartz, meeting the technical requirements of sand for concrete basically. As the purified grit sediment content increases, the porosity of the mortar decreases, the percentage of pores with pore size of >50 nm increases, and the compressive strength, flexural strength, chlorine ion penetration resistance, and carbonation resistance basically reduce.
结论
（1）洗砂工艺能够有效去除污水沉砂中的杂质，经洗砂工艺后的净化沉砂颗粒形貌与天然河砂相似，同时含有较多贝壳和少量黑色颗粒，细度模数为2.9，矿物组成以石英为主。净化沉砂的品质能够满足一般混凝土用砂要求，但其含有少量轻物质，松散堆积空隙率较大，坚固性较差，不适用于制备高强度混凝土。
（2）随着净化沉砂掺量的增加，砂浆的孔隙率降低，孔径＞50 nm的孔隙占比增大，3、7、28 d抗压强度和抗折强度基本降低，28 d非稳态氯离子迁移系数增大，3、7、14、28 d碳化深度基本增大。
（3）净化沉砂与浆体之间存在明显的界面过渡区，且周围存在部分微孔；净化沉砂中的贝壳、黏土、煤炭等物质会在一定程度上削弱砂浆试件的力学性能和耐久性能。因此，在实际工程应用中，应合理控制净化沉砂的掺量以保证工程质量。
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引用本文
丁小波,邓臻,易鹏,等.污水沉砂的净化处理及其对砂浆性能的影响[J].混凝土与水泥制品,2025(8):47-51,56.
DING X B,DENG Z,YI P,et al.Purification treatment of sewage grit sediment and its effect on the performance of mortar[J].China Concrete and Cement Products,2025(8):47-51,56.
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