摘要
为了研究粉胶比对沥青胶浆高低温性能的影响,以及采用水泥、消石灰替代部分矿粉后沥青胶浆的高低温性能变化,采用布氏黏度(RTV)试验研究了不同温度、粉胶比条件下沥青胶浆布氏黏度变化情况。通过动态剪切流变(DSR)试验测试复数剪切模量G^*、相位角δ、车辙因子G^*/sin(δ)等指标,分析沥青胶浆的高温流变特性;采用弯曲梁流变(BBR)试验测试不同温度、粉胶比和水泥、消石灰替换量的沥青胶浆的劲度模量S和蠕变速率m,分析不同沥青胶浆的低温流变特性,并且通过引入低温系数(λ=S/m)进一步评价沥青胶浆的低温性能,从而全面分析不同粉胶比以及不同水泥、消石灰替换量对沥青胶浆的高温性能和低温性能的影响。研究结果表明:增大粉胶比能提高沥青胶浆的高温稳定性,降低感温性,但同时也会降低其低温抗裂性,建议合理的粉胶比范围为1.0~1.3;用消石灰或水泥替代部分矿粉具有同样的效果,均可提升沥青胶浆的高温稳定性,但低温性能也会有所降低;当采用水泥替代时,建议水泥用量为矿粉质量的20%以获得较好的经济性和改善效果;采用消石灰替代时,建议消石灰用量为矿粉质量的20%,以免对沥青胶浆的低温性能产生较大不利影响,必要时应根据实际工程情况加以确定。
In order to study the influence of the filler-asphalt ratio on the high-and-low-temperature performance of asphalt mortar,and change of high-and-low-temperature properties of asphalt mortar after replacing some mineral powder with cement or hydrated lime,the Brookfield viscometer(RTV)was used to study the changes of RTV of asphalt mortar under different temperatures and filler-asphalt ratios,the complex shear modulus G^*,phase angleδ,rutting factor G^*/sin(δ)and other indicators of asphalt mortar under different conditions were tested,by using the dynamic shear rheometer(DSR)to study the rheological properties of asphalt mortar at high temperature,and the bending beam rheometer(BBR)was used to test the stiffness modulus S and creep rate m of asphalt mortars with different temperatures,filler-asphalt ratios and substitutions of cement or hydrated lime in order to study the low-temperature rheological properties of different asphalt mortars,the low-temperature coefficientλ=S/m was introduced to further evaluate the low-temperature performance of asphalt mortar,so as to comprehensively study the effects of different filler-asphalt ratios and different cement or hydrated lime substitutions on the high-and-low-temperature performance of asphalt mortar.The results show that increasing the filler-asphalt ratio can improve the high-temperature stability of asphalt mortar,reduce the temperature sensitivity of asphalt mortar,but also reduce the low-temperature cracking resistance of asphalt mortar,the recommended reasonable filler-asphalt ratio range is 1.0 to 1.3.Replacing some of the mineral powder with hydrated lime or cement has the same effect,which can improve the high-temperature stability of asphalt mortar but decrease the low-temperature performance.When using cement,it is recommended that the amount of cement should be 20%of the quality of mineral powder to obtain batter economy and effect.When adopting hydrated lime,it is suggested that the amount of hydrated lime should be 20%of the quality of mineral powder,so that it will not have a more adverse impact on the low-temperature performance of asphalt mortar.If necessary,it should be determined according to the actual engineering situation.9 tabs,24 figs,35 refs.
作者
许新权
唐胜刚
杨军
XU Xin-quan;TANG Sheng-gang;YANG Jun(School of Transportation,Southeast University,Nanjing 211189,Jiangsu,China;Guangdong Hualu Transport Technology Co.Ltd,Guangzhou 510420,Guangdong,China)
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第4期14-26,共13页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(51778140)
广东省交通运输厅科技计划项目(2016-02-009)。
关键词
道路工程
沥青胶浆
粉胶比
高温稳定性
低温抗裂
水泥
消石灰
road engineering
asphalt mortar
filler-asphalt ratio
high-temperature stability
low temperature cracking resistance
cement
hydrated lime
