胶石比对AAM稳定碎石强度和收缩性能的影响  

Effect of binder aggregate ratio on strength and shrinkage of AAM stabilized macadam

作　　者：于滨 陈德勇 李沛青 李帅君 李一林 贾致荣[1] YU Bin;CHEN Deyong;LI Peiqing;LI Shuaijun;LI Yilin;JIA Zhirong(School of Architectural Engineering,Shandong University of Technology,Zibo 255049,China;School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo 255049,China;Shandong Jiuqiang Group Company Limited,Zibo 255000,China)

机构地区：[1]山东理工大学建筑工程学院,山东淄博255049 [2]山东理工大学交通与车辆工程学院,山东淄博255049 [3]山东九强集团有限公司,山东淄博255000

出　　处：《山东理工大学学报（自然科学版）》2023年第4期8-14,共7页Journal of Shandong University of Technology:Natural Science Edition

基　　金：山东省自然科学基金项目(ZR2020ME269,ZR2022ME133)。

摘　　要：为了获得胶石比对AAM稳定碎石的强度和收缩性能的影响,实现AAM稳定碎石在道路工程中的应用,以钛石膏∶矿渣∶赤泥质量比为4∶6∶1.5,6%硅酸钠为激发剂,制备了5∶95、10∶90、15∶85、20∶80、25∶75五种胶石比的AAM稳定碎石,测定了7 d和28 d的无侧限抗压强度、劈裂强度、软化系数和干缩系数,进行了最佳胶石比下AAM的SEM和XRD测试。结果表明:当胶石比在5∶95~25∶75的范围内时,材料的无侧限抗压强度和劈裂强度随胶石比的增大而增大;软化系数均随胶石比的增大呈先增加后减小的趋势,在胶石比为15∶85时出现峰值;在同一胶石比下,随着养护龄期的增加,AAM稳定碎石的失水率随之增加,干缩系数也随之增加,且在前期增加迅速,后期增长平缓甚至下降;在同一龄期下,随着胶石比的增加,AAM稳定碎石的干缩系数也随之增加,失水率随之下降;最佳胶石比为15∶85,该胶石比下AAM稳定碎石的无侧限抗压强度、劈裂强度、水稳定性、收缩性能综合较优;胶凝体系中水化产物主要为钙矾石和C-S-H,且水化产物随养护龄期增加而不断产生,促进材料的强度增长。In order to obtain the influence of binder aggregate ratio on the strength and shrinkage of AAM stabilized macadam,and realize the application of AAM stabilized macadam in road engineering,we used the raw materials with the mass ratio of titanium gypsum∶slag∶red mud as 4∶6∶1.5 and 6%Na 2 SiO 3 as excitation agent,and prepared AAM stabilized macadams of five binder aggregate ratios(5∶95,10∶90,15∶85,20∶80,25∶75).We measured the 7 d and 28 d unconfined compressive strength,splitting strength,softening coefficient and dry shrinkage coefficient of the specimens,determined the best binder aggregate ratio,and performed the SEM and XRD tests.The test results showed that:(1)The unconfined compressive strength and splitting strength of the material increased with the increase of the binder aggregate ratio when the binder aggregate ratio was in the range of 5∶95~25∶75.(2)The softening coefficient of the AAM stabilized macadam increased firstly and then decreased with the increase of binder aggregate ratio,and the peak value appeared when the binder aggregate ratio was 15∶85.(3)The water loss rate and dry shrinkage coefficient of AAM stabilized macadam increased with the increase of curing age under the same binder aggregate ratio,which increased rapidly in the early stage,then increased smoothly and even decreased in the later stage.The dry shrinkage coefficient of AAM stabilized macadam also increased and the water loss rate decreased with the increase of binder aggregate ratio at the same curing age.(4)The best binder aggregate ratio was 15∶85.The unconfined compressive strength,splitting strength,water stability and shrinkage properties of AAM stabilized macadam were better under this binder aggregate ratio.(5)The hydration products were mainly ettringite and C-S-H.The hydration products were produced continuously with the increase of curing age,which promoted the strength growth of materials.

关 键 词：AAM稳定碎石 胶石比 强度 收缩性能 

分 类 号：U414[交通运输工程—道路与铁道工程]