摘要
为了实现固体废弃物钢渣在半刚性基层材料中的合理利用,首先选用C-B-3型骨架密实型级配进行击实试验,根据7 d无侧限抗压强度结果优选出适宜的水泥掺量和钢渣掺量组合。其次,对优选组合的混合料进行了无侧限抗压强度、间接抗拉强度、抗压回弹模量以及抗收缩和抗冲刷性能测试。最后,分析不同养护龄期下水泥掺量和钢渣掺量对基层材料性能的影响,揭示水泥和钢渣在基层材料中的强度形成机理。研究结果表明:水泥掺量一定时,钢渣基层材料无侧限抗压强度随钢渣掺量的增加呈现先增大后减小的趋势。水泥掺量(质量分数,下同)为5%时,与未掺钢渣基层材料相比,养护7、14、28 d的45%钢渣掺量基层材料抗压强度分别提高6.8%、9.6%、6.0%;65%钢渣掺量基层材料则分别提高11.3%、15.4%、12.1%。5%水泥掺量下,养护28 d的45%和65%钢渣掺量基层混合料较未掺钢渣基层混合料冲刷质量损失率减小0.031%和0.046%;6%水泥掺量下则分别减小0.034%和0.041%。5%水泥掺量下,65%钢渣掺量的混合料较未掺钢渣时干缩系数减小52.4%,温缩系数提高26.9%;6%水泥掺量下则分别减小49.4%和提高31.6%。因此,在合理掺量下,钢渣基层力学性能和抗冲刷性能明显优于普通水泥稳定碎石,钢渣在一定程度上可改善基层材料的抗干燥收缩性能,但却不利于抗温度收缩性能。
In order to realize the rational utilization of solid waste steel slag in semi-rigid base material,the C-B-3 type skeleton compaction gradation was selected,firstly,the compaction test was carried out,and the appropriate combination of cement and steel slag dosage was selected based on the results of the 7 d unconfined compressive strength test.Furthermore,following the unconfined compressive strength test,other parameters such as the indirect tensile strength,compressive resilience modulus,shrinkage and water erosion resistance of the chosen mixture were tested.Finally,the influence of cement dosage and steel slag content on the properties of base material at different curing ages were analyzed for revealing the strength formation mechanism,and influence that varying the proportions of cement and steel slag had on the base material.The results show that when cement dosage is kept constant,the unconfined compressive strength of steel slag base material increases at first,but then decreases with further increase steel slag content.Compared with the base material without steel slag,when the cement dosage and steel slag dosages(mass fraction,the same below)are 5%and 45%respectively,the compressive strength of the base material after 7,14 and 28 d curing increased by 6.8%,9.6%and 6.0%respectively.Meanwhile,when steel slag content is increased to 65%,the compressive strength under the same conditions is increased by 11.3%,15.4%and 12.1%respectively.In the water erosion resistance test,at 5%cement dosage,the post 28 d curing mass loss rate of the base material with 45%and 65%steel slag contents are 0.031%and 0.046%respectively,lower than that of the base mixture without steel slag content,and it is 0.034%and 0.041%respectively when cement dosage is increased to 6%.When compared with the mixture without steel slag,the dry shrinkage coefficient and temperature shrinkage coefficient of the mixture with 65%and 5%steel slag and cement contents decreased by 52.4%and 26.9%respectively,and when cement content is increased to 6
作者
冀欣
盛燕萍
路再红
辛德军
龙云飞
陈华鑫
JI Xin;SHENG Yan-ping;LU Zai-hong;XIN De-jun;LONG Yun-fei;CHEN Hua-xin(School of Material Science and Engineering,Chang'an University,Xi'an 710061,Shaanxi,China;Ministry ofEducation Engineering Center for Traffic Pavement Materials,Chang'an University,Xi'an 710064,Shaanxi,China;Inner Mongolia Transportation Design and Research Institute,Huhhot 010000,Inner Mongolia,China;Baotou Transportation Investment Group,Baotou 014030,Inner Mongolia,China;Baotou Highway Planning Survey and Design Company,Baotou 014040,Inner Mongolia,China)
出处
《长安大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第4期21-31,共11页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(51208047)
内蒙古自治区交通运输科技项目(NJ-2019-24)。
关键词
道路工程
钢渣
半刚性基层
力学性能
抗收缩性能
抗冲刷性能
road engineering
steel slag
semi-rigid base
mechanical property
shrinkage resistance
anti-erosion performance
