采用镀金石英砂来富集大气中的气态总汞,AMA(advanced m ercury analyzer)254测汞仪测定。结果表明,不同采样时间下的单级吸附管的吸附效率均在90%以上,采样40 m in时的相对标准偏差为5%左右。与巯基棉吸附及吸收液吸收方法的对比显示...采用镀金石英砂来富集大气中的气态总汞,AMA(advanced m ercury analyzer)254测汞仪测定。结果表明,不同采样时间下的单级吸附管的吸附效率均在90%以上,采样40 m in时的相对标准偏差为5%左右。与巯基棉吸附及吸收液吸收方法的对比显示该方法具有吸收效果好、多次采样的精密度高、操作简便并且可以再生重复使用等优点。运用该法对上海徐家汇等几个地点的大气总汞进行了测定。展开更多
There is a great demand for high performance rapid repair mortar(RRM)because of the wide use of cement concrete.Solid-waste-based sulfoaluminate cement(WSAC)is very suitable as a green cementitious material for repair...There is a great demand for high performance rapid repair mortar(RRM)because of the wide use of cement concrete.Solid-waste-based sulfoaluminate cement(WSAC)is very suitable as a green cementitious material for repair materials because of its characteristics of high early-age strength and short setting time.However,the influence and optimization of various factors of WSAC-based RRM,such as water-to-RRM ratio,binder-to-sand ratio and additives,as well as the further solid waste replacement of aggregate,remain to be studied.This paper comprehensively studied the influence of the above factors on the performance of WSAC-based RRM and obtained a green high-performance RRM by optimizing these factors.The experimental results showed that the early and late strength of the obtained RRM is excellent,and the setting time and fluidity are appropriate,which reflected good mechanical properties and construction performance.Ordinary Portland cement(OPC)doping could not improve RRM strength.It was feasible to prepare RRM with gold tailing sand replacing part of the quartz sand.This paper provides data and a theoretical basis for the preparation of high-performance RRM based on solid waste,expanding the high value utilization of solid waste,which is conducive to the development of a low carbon society.展开更多
文摘采用镀金石英砂来富集大气中的气态总汞,AMA(advanced m ercury analyzer)254测汞仪测定。结果表明,不同采样时间下的单级吸附管的吸附效率均在90%以上,采样40 m in时的相对标准偏差为5%左右。与巯基棉吸附及吸收液吸收方法的对比显示该方法具有吸收效果好、多次采样的精密度高、操作简便并且可以再生重复使用等优点。运用该法对上海徐家汇等几个地点的大气总汞进行了测定。
基金National Key R&D Program of China(No.2020YFC1910000)the Shandong Natural Science Foundation Youth Project(No.ZR2020QE201).
文摘There is a great demand for high performance rapid repair mortar(RRM)because of the wide use of cement concrete.Solid-waste-based sulfoaluminate cement(WSAC)is very suitable as a green cementitious material for repair materials because of its characteristics of high early-age strength and short setting time.However,the influence and optimization of various factors of WSAC-based RRM,such as water-to-RRM ratio,binder-to-sand ratio and additives,as well as the further solid waste replacement of aggregate,remain to be studied.This paper comprehensively studied the influence of the above factors on the performance of WSAC-based RRM and obtained a green high-performance RRM by optimizing these factors.The experimental results showed that the early and late strength of the obtained RRM is excellent,and the setting time and fluidity are appropriate,which reflected good mechanical properties and construction performance.Ordinary Portland cement(OPC)doping could not improve RRM strength.It was feasible to prepare RRM with gold tailing sand replacing part of the quartz sand.This paper provides data and a theoretical basis for the preparation of high-performance RRM based on solid waste,expanding the high value utilization of solid waste,which is conducive to the development of a low carbon society.
