黏土基铸造废旧砂特性及其对砂浆性能的影响
Characteristics of Clay-based Foundry Waste Sand and Its Influence on Properties of Cement Mortar
关键词：
黏土基铸造废旧砂；性能指标；砂浆；工作性；力学性能
Key words：
Clay-based foundry waste sand; Performance index; Cement mortar; Workability; Mechanical property
刊期：
2022年第10期
DOI：
10.19761/j.1000-4637.2022.10.101.04
文章编号：
基金项目：
宁波市科技局重大重点项目（2017C510007）；国家级大学生创新创业训练计划项目（201811058006）。
作者：
许晓烨1，李丹妮1，温小栋1，冯 蕾1，盛惠佳2，许 琳3
单位：
1.宁波工程学院 建筑与交通工程学院，浙江 宁波315000；2.宁波今新集团有限公司，浙江 宁波315000；3.宁波思通矿业有限公司，浙江 宁波315000
摘要
摘 要：分析了黏土基铸造废旧砂的特性，研究了黏土基铸造废旧砂对砂浆性能的影响。结果表明：黏土基铸造废旧砂中含有微量重金属，但在相关环境标准许可范围内；与河砂相比，黏土基铸造废旧砂的颗粒形貌不规则、细颗粒较多；黏土基铸造废旧砂的表观密度与河砂接近，但堆积密度显著低于河砂，吸水率、亚甲蓝值和氯离子含量显著大于河砂；该黏土基铸造废旧砂的细度模数为1.76，属于Ⅲ区砂；当黏土基铸造废旧砂的替代率小于20%时，对砂浆的流动度和减水剂用量影响不大；当黏土基铸造废旧砂的替代率为40%时，砂浆的强度达到最高。
Abstract: The characteristics of clay-based foundry waste sand were analyzed, and the influence of clay-based foundry waste sand on the properties of cement mortar was studied. The results show that the clay-based foundry waste sand contains trace heavy metals, but it is within the allowable range of relevant environmental standards. Compared with river sand, the clay-based foundry waste sand has irregular particle morphology and more fine particles. The apparent density of the clay-based foundry waste sand is close to that of river sand, but the bulk density is significantly lower than that of river sand, and the water absorption, methylene blue value and chloride ion content are significantly higher than those of river sand. The fineness modulus of the clay-based foundry waste sand is 1.76, which belongs to the zone Ⅲ sand. When the replacement rate of clay-based foundry waste sand is less than 20%, it has little effect on the fluidity and the water reducing agent amount of the cement mortar. When the replacement rate of the clay-based foundry waste sand is 40%, the strength of the cement mortar is the highest.
结论
（1）WFS中含有微量重金属，但在相关环境标准许可范围内，不会对环境造成污染。
（2）与河砂相比，WFS颗粒不规则、较粗糙且棱角性较强，表观密度、堆积密度较低，吸水率、亚甲蓝值和氯离子含量较高。WFS的细度模数为1.76，属于Ⅲ区砂。
（3）当WFS替代率小于20%时，对砂浆流动度影响不大；当WFS替代率为40%时，砂浆的抗压、抗折强度达到最高。实际使用时，需调整减水剂用量使掺WFS砂浆的流动性满足施工要求。
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引用本文
许晓烨,李丹妮,温小栋,等.黏土基铸造废旧砂特性及其对砂浆性能的影响[J].混凝土与水泥制品,2022(10):101-104.
XU X Y,LI D N,WEN X D,et al.Characteristics of Clay-based Foundry Waste Sand and Its Influence on Properties of Cement Mortar[J].China Concrete and Cement Products,2022(10):101-104.
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