摘要
为了实现水泥稳碎石基层整体性质量客观和公正的评价,消除7 d取芯芯样质量评判的随意性、弥补因不考虑气候条件和公路等级等因素对施工质量评价的局限性,选择高速、一级、二级和三级共5条公路,对7 d龄期的水泥稳定粒料类基层进行了大量的取芯试验,系统地对取芯芯样的形态进行了调研、统计和分析,根据芯样的完整程度,将其分为完整类、残缺类和松散类3类,芯样完整性的差异代表其扩散荷载应力能力的不同,根据芯样的致密程度,将芯样进一步分成8级,芯样致密性的不同体现服役功能性差别,提出了评价路段芯样完整率的计算方法,确定了芯样完整率技术标准的确定原则,对于季冻区宜采用F(Ⅰ+Ⅱ)作为评价指标,对于非季冻区宜采用F(Ⅰ)作为评价指标,并根据回归曲线,提出了不同区域不同等级道路7 d龄期内的芯样完整率技术标准。结果表明:芯样完整率与道路等级呈线性关系,道路等级对其影响幅度为2%~9%,养生模式的影响幅度为10%左右,气候因素的影响幅度为5%左右。研究成果实现了对半刚性基层取芯芯样质量和整体性质量的定量化评价。
In order to achieve an objective and fair evaluation of the integrity quality of cement-treated aggregate base layers(CTAB),eliminate the randomness of quality evaluation of 7 d core samples,and make up for the limitations of construction quality evaluation due to the lack of consideration of climatic characteristics and highway grade,five highways,including expressway,primary,secondary and third-grade roads are selected,a large number of core tests are carried out on CTAB at 7 d age,and the condition of cores are systematically investigated,statistically analyzed,according to the influence on pavement structural performance,cores category and grade are classified.According to the integrity degree of the core,it can be divided into three categories:integral class,incomplete class and loose class,the difference in the integrity of the core represents the difference in its diffusion load stress capacity,based on the density,the cores are further divided into eight grades,the difference in core density reflects the difference in using function,the calculation method of core integrity rate is proposed,and the principle of determining the technical standard of core integrity rate is determined,F(Ⅰ+Ⅱ)should be used as the evaluation index for seasonal frozen area,and F(Ⅰ)should be used as the evaluation index for non-seasonal frozen area.according to the regression curve,the technical standard of core integrity rate for different grades of roads in different areas within 7 days is proposed.The results show that the core integrity rate and road grade showed a linear trend,and the influence range of road grade is 2%-9%,the influence range of coring-mode is about 10%,and the influence range of climate is about 5%.The research results achieve the quantitative evaluation of cores quality and integrity properties of semi-rigid base.
作者
王龙
解晓光
王政
姜凤霞
WANG Long;XIE Xiaoguang;WANG Zheng;JIANG Fengxia(School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin 150090,China;Changchun Runde Investment Group Co.,Ltd.,Changchun 130001,China;Changchun Jianye Group Co.,Ltd.,Changchun 130022,China)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2024年第7期19-27,共9页
Journal of Harbin Institute of Technology
基金
国家自然科学基金(51878229)。
关键词
道路工程
水泥稳定碎石
芯样分类
整体质量
定量评价
完整率
road engineering
cement-treated aggregate base(CTAB)
core classification
integrity quality
quantitative evaluation
integrity rate
