采用工业废渣复配材料以及SY添加剂对拜耳法赤泥进行固化处理,通过承载比(CBR)、无侧限抗压强度(UCS)、重结晶和吸水率试验,研究了废渣固化赤泥用作道路材料的可行性,进一步对比分析了废渣固化材料及SY添加剂掺量变化对固化赤泥体系性...采用工业废渣复配材料以及SY添加剂对拜耳法赤泥进行固化处理,通过承载比(CBR)、无侧限抗压强度(UCS)、重结晶和吸水率试验,研究了废渣固化赤泥用作道路材料的可行性,进一步对比分析了废渣固化材料及SY添加剂掺量变化对固化赤泥体系性能的影响规律.结果表明:废渣固化赤泥体系在不同压实度下的CBR值均可达到25%以上,7 d UCS值超过3 MPa,且随废渣固化材料掺量的增加而逐渐增大.此外,废渣固化赤泥体系的重结晶情况良好,吸水率较低,有利于长期性能的稳定.而SY添加剂的使用能使废渣固化赤泥体系的性能得到进一步增强.当SY添加剂掺量为0.1%时,废渣固化赤泥体系的物理力学性能即可得到明显提高.展开更多
This paper describes a study on the corrosion behavior of steel reinforcement in CAC mortars via electrochemical methods including corrosion potential,electrochemical impedance,and linear polarization evaluation.Resul...This paper describes a study on the corrosion behavior of steel reinforcement in CAC mortars via electrochemical methods including corrosion potential,electrochemical impedance,and linear polarization evaluation.Results indicate that there is a non-linear relationship between the corrosion degree of steel reinforcement in CAC mortar and the concentration of NaCl solution.The electrochemical parameters of specimens immersed in 3%NaCl solution suddenly drop at 40 days,earlier than 60 days of the reference.And the charge transfer resistivity of the specimen has decreased by 11 orders of magnitude at 40 days,showing an evident corrosion on steel reinforcement.However,it is interesting to notice that the corrosion is delayed by high external chloride concentration.The specimens immersed in 9%and 15%NaCl solutions remain in a relatively stable state within 120 days with slight pitting.The great corrosion protection of CAC concrete to embedded steel bars enables its wide application in marine.展开更多
文摘采用工业废渣复配材料以及SY添加剂对拜耳法赤泥进行固化处理,通过承载比(CBR)、无侧限抗压强度(UCS)、重结晶和吸水率试验,研究了废渣固化赤泥用作道路材料的可行性,进一步对比分析了废渣固化材料及SY添加剂掺量变化对固化赤泥体系性能的影响规律.结果表明:废渣固化赤泥体系在不同压实度下的CBR值均可达到25%以上,7 d UCS值超过3 MPa,且随废渣固化材料掺量的增加而逐渐增大.此外,废渣固化赤泥体系的重结晶情况良好,吸水率较低,有利于长期性能的稳定.而SY添加剂的使用能使废渣固化赤泥体系的性能得到进一步增强.当SY添加剂掺量为0.1%时,废渣固化赤泥体系的物理力学性能即可得到明显提高.
基金Funded by National Natural Science Foundation of China(Nos.51772212,51402216,51978505)。
文摘This paper describes a study on the corrosion behavior of steel reinforcement in CAC mortars via electrochemical methods including corrosion potential,electrochemical impedance,and linear polarization evaluation.Results indicate that there is a non-linear relationship between the corrosion degree of steel reinforcement in CAC mortar and the concentration of NaCl solution.The electrochemical parameters of specimens immersed in 3%NaCl solution suddenly drop at 40 days,earlier than 60 days of the reference.And the charge transfer resistivity of the specimen has decreased by 11 orders of magnitude at 40 days,showing an evident corrosion on steel reinforcement.However,it is interesting to notice that the corrosion is delayed by high external chloride concentration.The specimens immersed in 9%and 15%NaCl solutions remain in a relatively stable state within 120 days with slight pitting.The great corrosion protection of CAC concrete to embedded steel bars enables its wide application in marine.
