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基于微纳米处理与级配调控的铜尾矿掺合料混凝土耐久性研究
作者：鲁亚1，2，徐伟1，2，胡泊1，2，3，魏琦1，2，刘松柏1，2，杜任远1，2
（1.江西省建材科研设计院有限公司，江西 南昌 330000；
2.江西省固废建材安全性工程技术研究中心，江西 南昌 330000；
3.江西省建材产品质量监督检验站有限公司，江西 南昌 330000）
2.江西省固废建材安全性工程技术研究中心，江西 南昌 330000；
3.江西省建材产品质量监督检验站有限公司，江西 南昌 330000）
摘要：采用粉磨、化学激发和级配调控复合处理制得铜尾矿掺合料，用于制备C30混凝土，研究了铜尾矿掺合料对混凝土长龄期抗碳化、抗氯离子渗透性能的影响。结果表明：铜尾矿掺合料掺量为60 kg/m3以内时，掺加铜尾矿掺合料的混凝土不同龄期（0~365 d）抗压强度、抗碳化以及抗氯离子渗透性能与掺等量Ⅱ级粉煤灰的基本相同。铜尾矿掺合料中2 μm以内的微纳米颗粒具备微活性，其中活性SiO2和Al2O3与浆体的Ca（OH）2发生二次水化反应，生成C-S-H凝胶；同时，Ca（OH）2的消耗可以促进水化，减少有害孔的形成；级配调控作用可改善粉体胶凝体系的堆积密实度，增强了混凝土的骨料-浆体界面强度，进而提高混凝土的耐久性。
关键词：铜尾矿掺合料；耐久性；孔结构；级配调控
中图分类号：TU528.041 文献标识码：A 文章编号：1001-702X（2023）04-0043-07
Study on durability of concrete of copper tailings admixture based on micro-nano treatment and gradation regulation
LU Ya1，2，XU Wei1，2，HU Po1，2，3，WEI Qi1，2，LIU Songbai1，2，DU Renyuan1，2
（1.Jiangxi Building Materials Research and Design Institute Co. Ltd.，Nanchang 330000，China；2.Jiangxi Solid Waste Building Materials Safety Engineering Technology Research Center，Nanchang 330000，China；3.Jiangxi Building Materials Product Quality Supervision and Inspection Station Co. Ltd.，Nanchang 330000，China）
Abstract：By grinding，chemical excitation and gradation control to prepare high quality copper tailings admixture，which was used to prepare C30 concrete. The influence of copper tailings admixture on carbonization resistance and chloride ion penetration resistance of concrete in long age was studied. The results show that when the dosage of copper tailings admixture is within 60 kg/m3，the compressive strength，carbonization resistance and chloride ion penetration resistance of concrete mixed with copper tailings admixture at different ages（0~365 d） are basically the same as those of the same dosage of Ⅱ-level fly ash. The micro-nano particles within 2 μm of copper tailings admixture have micro-activity，and the active SiO2 and Al2O3 react with the Ca（OH）2 of the slurry to form C-S-H gel. Meanwhile，the consumption of Ca（OH）2 can promote hydration and reduce the formation of harmful pores in concrete. The gradation control can improve the packing compactness of the powder cementing system，enhance the aggregate-slurry interface strength of concrete，and thus improve its durability.
Key words：copper tailings admixture，durability，pore structure，gradation regulation