碱激发粉煤灰水泥再生沥青混凝土性能研究
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摘要
通过无侧限抗压强度、劈裂强度(删除劈裂强度)、水稳定性、弹性模量以及扫描电镜测试,研究了NaOH激发水泥-粉煤灰(C-FA)胶凝材料对再生沥青混凝土性能的影响.研究表明:NaOH激发粉煤灰水泥胶凝材料能够对再生RAP(reclaimed asphalt pavement)进行有效的化学固化;当组分为1/5≤A/S≤5/5、水泥2%～4%、粉煤灰5%～6%时,随着NaOH掺量的增加,再生沥青混凝土的抗压强度、水稳定性以及体积稳定性随之提高;随着NaOH的掺量和加载频率的提高,再生沥青混凝土7 d龄期动载荷条件下的弹性模量明显提高.
The recycle of road asphalt concrete could help to realize the utilization of construction waste and sustainable development. By means of unconfined compressive strength, water stability, temperature stability and scanning election microscope(SEM) test, the properties of recycled asphalt concrete with NaOH activated fly ash and cement are studied. The results show that the recycled RAP(reclaimed asphalt pavement) could be solidified by NaOH activated fly ash and cement cementitious materials. When the component is 1/5≤A/S≤5/5,cement dosage=2%-6%, fly ash dosage=5%-6%, with the NaOH dosage rising, the unconfined compressive strength, water stability and temperature stability are improved; at the same time, with the NaOH dosage and loading frequency rising, the dynamic elastic modulus of recycled asphalt concrete with 7 d age, is improved obviously.
The recycle of road asphalt concrete could help to realize the utilization of construction waste and sustainable development. By means of unconfined compressive strength, water stability, temperature stability and scanning election microscope(SEM) test, the properties of recycled asphalt concrete with NaOH activated fly ash and cement are studied. The results show that the recycled RAP(reclaimed asphalt pavement) could be solidified by NaOH activated fly ash and cement cementitious materials. When the component is 1/5≤A/S≤5/5,cement dosage=2%-6%, fly ash dosage=5%-6%, with the NaOH dosage rising, the unconfined compressive strength, water stability and temperature stability are improved; at the same time, with the NaOH dosage and loading frequency rising, the dynamic elastic modulus of recycled asphalt concrete with 7 d age, is improved obviously.
引文
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[14] Ma Baoguo,Wang Haifeng,Li Xiangguo.Cementation effect with cement during cold in-place recycling system of asphalt pavement[J].Journal of Civil,Architectural & Environmental Engineering,2010,32(4):44-48.
[15] StePhan D,Mallmanll R,Kxlofel D,et al.Influence on the hydration properties[J].Cement and Concrete Research,1999,(12):1959-1967.
[16] 王建宏,齐美富.石灰/粉煤灰水合反应制备高活性脱硫剂机理分析 [J].环境污染治理技术与设备,2003,4 (5) :34-36.Wang Jianhong,Qi Meifu.An analysis of the mechanism of preparation of highly active desulfurization agents from lime coal fly ash hydration[J].Techniques and Equipment for Environmental Pollution Control,2003,4 (5) :34-36.
[2] Koksal F,Gencel O,Brostow W,et al.Effect of high temperature on mechanical and physical properties of lightweight cement based refractory including expanded vermiculite[J].Materials Research Innovations,2012,161(1):7-12.
[3] Murphy Daniel T,Emery John J.Modified cold in-place asphalt recycling[J].TRR,1996,(1545):43-50.
[4] 马保国,李俊晓,李相国,等.水泥对泡沫沥青冷再生混合料水稳定性的影响[J].交通标准化,2011,(22):57-61.Ma Baoguo,Li Junxiao,Li Xiangguo,et al.Effect of portland cement on water stability of foam asphalt cold in-place recycled mixture[J].Communications Standardization,2011,(22):57-61.
[5] 拾方治,李秀君,孙大权,等.沥青混合料设计方法概述 [J].公路,2004,(11):103-107.Shi Fangzhi,Li Xiujun,Sun Daquan,et al.Discussion about design methods for recycling cold mix asphalt[J].Highway,2004,(11):103-107.
[6] Peng Kun.Decay properties and foam index of the foamed bitumen with low penetration[J].Highway Engineering,2012,(5):206-209.
[7] Don Chen,Charles T Jahren,Hosin David Lee,et al.Effects of recycled materials on long-term performance of cold in-place recycled asphalt roads[J].Journal of Performance of Constructed Facilifies,2010:275-280.
[8] Cheng-Tsung Lu,Ming-Feng Kuo,Der-Hsien Shen.Composition and reaction mechanism of cement-asphalt mastic[J].Construction and Building Materials,2009,(23):2580-2585.
[9] Ma Baoguo,Wang Haifeng,Wei Dingbang.Performance of RAP in the system of cold in-place recycling of asphalt pavement[J].Journal of Wuhan University of Technology (Materials Sciences Edition),2010,26(6):1211-1214.
[10] 栾晓凤,潘志华,王冬冬.粉煤灰水泥体系中粉煤灰活性的化学激发[J].硅酸盐通报,2010,29(4):757-761.Luan Xiaofeng,Pan Zhihua,Wang Dongdong.Study on the chemical activation of fly ash in fly ash blended portland cement system[J].Bulletin of the Chinese Ceramic Society,2010,29(4):757-761.
[11] 严金海,倪富健,杨美坤.乳化沥青冷再生混合料的间接拉伸疲劳性能[J].建筑材料学报,2011,14(1):59-61.Yan Jinhai,Ni Fujian,Yang Meikun.Indirect tensile fatigue propertits of asphalt emulsion cold recycled mixes[J].Journal of Building Materials,2011,14(1):59-61.
[12] 孙岩松.水泥掺量对乳化沥青冷再生混合料性能的影响[J].武汉理工大学学报,2013,35(4):46-48.Sun Yansong.Influence of portland cement on the performance of emulsified asphalt cold regeneration[J].Journal of Wuhan University of Technology,2013,35(4):46-48.
[13] 韦洪峰,李雷,那达慕.水泥稳定废旧沥青铣刨料再生材料性能试验研究[J].北方交通,2014,(8):102-107.Wei Hongfeng,Li Lei,Na Damu.Property test investigation on the recycled milling materials of cement stabilization waste pitch[J].Northern Communications,2014,(8):102-107.
[14] Ma Baoguo,Wang Haifeng,Li Xiangguo.Cementation effect with cement during cold in-place recycling system of asphalt pavement[J].Journal of Civil,Architectural & Environmental Engineering,2010,32(4):44-48.
[15] StePhan D,Mallmanll R,Kxlofel D,et al.Influence on the hydration properties[J].Cement and Concrete Research,1999,(12):1959-1967.
[16] 王建宏,齐美富.石灰/粉煤灰水合反应制备高活性脱硫剂机理分析 [J].环境污染治理技术与设备,2003,4 (5) :34-36.Wang Jianhong,Qi Meifu.An analysis of the mechanism of preparation of highly active desulfurization agents from lime coal fly ash hydration[J].Techniques and Equipment for Environmental Pollution Control,2003,4 (5) :34-36.