摘要
多年冻土地区路面水泥稳定砂砾基层应用中,普遍存在基层上下松散、中部板结的“夹层”现象。在定性分析的基础上,通过模拟多年冻土地区基层下垫层的可能湿度状况养生的强度试验,定量分析了湿度对水泥稳定砂砾强度形成的影响,探讨了“夹层”现象产生的原因。研究得出,垫层含水量小于基层混合料最佳含水量时,对基层混合料强度形成有明显影响,抗压强度随垫层含水量的减小而降低;模拟湿度养生混合料的强度形成过程与标准养生基本相近,但14 d后强度增长显著减缓;混合料形成骨架结构时,可以减轻水分损失对混合料后期强度形成的影响。结果表明:多年冻土地区特殊的湿度条件是水泥稳定砂砾基层出现“夹层”现象的主要原因,在基层施工中针对特殊湿度条件采取有效工程技术措施,可以避免“夹层”现象的出现。
The interlayers that characterized as harden in middle and incompact in top and below widely occurred in the cement-stabilized-gravel when contrustruing the base course of pavement in permafrost area. The influence of humidity condition on the strength forming of the base mixture were quantitatively analyzed by the strength test simulating the possible humidity condition of the underlay below the base in permafrost area, and the cause of this phenomena was discussed. It was pointed that the water content of the underlay evidently affects the strength forming of the base mixture while it is less than the optimal water content of the base mixture. With the water content of the underlay reducing, the compact strength of the base mix decreases. The strength forming process of the base mixture on the status simulating the humidity condition is basically near with that on the standard status, but evidently slows after fourteen days. The framework structure formed in the mixture can decrease the influence of the water loss to later strength forming. The results indicated that the special humidity condition of the permafrost area is the primary cause of the phenomena, and taking some effective engineering technical measures during the base course construction can avoid those interlayers. 2 tabs, 4 figs, 6 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第5期13-16,共4页
Journal of Chang’an University(Natural Science Edition)
基金
国家西部交通建设科技项目(200231881205)
关键词
道路工程
多年冻土地区
路面基层
水泥稳定砂砾
湿度条件
强度形成
夹层
road engineering
permafrost area
pavement base course
cement-stabilized-gravel
humidity condition
strength forming
interlayer
作者简介
马骉（1972-），男，甘肃会宁人，副教授，博士．
