水泥稳定大掺量改性磷石膏的制备与性能研究
Preparation and Performance Study of Cement Stabilized High Content Modified Phosphogypsum
张家豪 1赵丽华 2高奥东 3周应新 4许斌3
作者信息
- 1. 大连交通大学土木工程学院 大连市 116028;中路高科(北京)公路技术有限公司 北京市 100088
- 2. 大连交通大学土木工程学院 大连市 116028
- 3. 中路高科(北京)公路技术有限公司 北京市 100088
- 4. 云南省交通投资建设集团有限公司 昆明市 650228
- 折叠
摘要
为了进一步提高磷石膏资源在公路领域的综合利用水平与效率,改善路用环境质量,实现磷石膏绿色、高效、高价值、规模化利用,研制了水泥稳定磷石膏路面基层材料.通过室内试验确定材料配比,开展路用性能测试分析磷石膏在路面材料应用中的可行性.采用烘干法测量磷石膏的附着水含水率,确定烘干温度;采用正交试验法确定碱激发剂和增强剂的最佳掺量,通过无侧限抗压试验和间接抗拉(劈裂)试验分析改性前后抗压性能和间接抗拉性能的变化情况.研究结果表明:烘干法测量附着水含水率时的温度应设置为60℃,附着水含水率为9.81％;水泥稳定磷石膏材料的最佳含水率为20.1％,最大干密度为1.508 g/cm3;抗压性能随养护龄期的增长而增强,碱激发剂主要提升材料早期强度,增强剂主要增强后期强度;最优的改性配合比中碱激发剂掺量为1％,且增强剂掺量为1.5％;最优改性后水泥稳定磷石膏的间接抗拉性能比改性前提升了 57.1％.
Abstract
In order to further improve the comprehensive utilization level and efficiency of phosphogypsum resources in the field of highway engineering,improve the quality of road environment,and realize the green,efficient,high-value and large-scale utilization of phosphogypsum,the cement stabilized phosphogypsum pavement base material is studied and prepared in the paper,the material ratio is determined through indoor experiments,and road performance tests are carried out to analyze the feasibility of phosphogypsum in the application of pavement materials.The drying method is used to measure the moisture content of attached water of phosphogypsum and determine the drying temperature.The optimal dosage of alkali activator and reinforcement are determined by orthogonal experiment.The changes of compressive properties and indirect tensile properties before and after modification are analyzed by unconfined compression test and indirect tensile(splitting)test.The results show that the temperature should be set at 60℃ and the moisture content of the attached water should be 9.81％when the drying method is used to measure the moisture content of the attached water.The optimum moisture content of cement stabilized phosphogypsum material is 20.1％,and the maximum dry density is 1.508 g/cm3.The compressive performance increases with the increase of curing time.Alkali activator mainly improves the early strength of the material,and reinforcement mainly enhances the late strength.The optimal mixing ratio is 1％content of alkali activator and 1.5％of reinforcement.The indirect tensile property of cement stabilized phosphogypsum after optimal modification is 57.1％higher than that of the original state.
关键词
路面基层/水泥稳定磷石膏/磷石膏/烘干温度/改性/材料配合比Key words
pave ment base/cement stabilized phosphogypsum/phosphogypsum/drying temperature/modification/material mix proportion引用本文复制引用
基金项目
云南省科技厅重点研发计划项目(202103AA080013)
辽宁省科学技术应用基础研究计划项目(2023JH2/101300140)
辽宁省教育厅科学研究支持项目(LJKMZ20220833)
出版年
2024
NETL
NSTL
万方数据