摘要
为研究碱渣对水泥稳定半刚性再生基层路用性能的影响,对不同水泥掺量和不同碱渣-水泥配比的
再生材料进行了 7 d 无侧限抗压强度的对比。选择纯水泥再生半刚性材料以及碱渣-水泥复合再生
半刚性材料 2 种方案进行比对试验。通过无侧限抗压强度试验、劈裂强度试验、动态模量试验以及
水稳定性试验对比分析了 2 种再生方案的差别,结果表明:碱渣会促进水泥的前期水化反应,增强
水泥再生 料的 前期抗压强度;由无 侧限 抗压 强度试验得出碱渣与 水泥 的最 佳配比为:2%碱渣+3%
水泥 ;碱 渣会降低水 泥再 生材料的劈 裂强 度,提高材 料的前期动态模 量且一定程度改 善水稳定性 。
微观试验表明碱渣有利于材料前期胶结物质的生成,但水泥-碱渣再生料后期微观颗粒呈小团状分
布,因此整体性不如水泥再生料,孔隙率较大,强度弱于水泥再生料。
Abstract
In order to obtain the influence of alkali slag on the road performance of cement
stabilized semi-rigid recycled base,the 7 d unconfined compressive strength of
recycled materials with different cement content and different alkali slag-cement
ratios was compared.Two schemes of pure cement regeneration semi-rigid material
and alkali slag cement composite regeneration semi-rigid material were selected for
comparison experiments.Through the unconfined compressive strength test,split
strength test,dynamic modulus test and water stability test,the difference between
the two regeneration schemes is analyzed,and the influence of alkali slag on the
mechanical properties and water stability of cement stabilized semi-rigid recycled
materials is studied.The results show that alkali slag can promote the early
hydration reaction of cement and enhance the early compressive strength of cement
recycled materials.The unconfined compressive strength test shows that the optimal
ratio of cement and alkali slag is 2% alkali slag +3% cement.Alkali slag will reduce
the splitting strength of cement recycled materials,but will increase the early
dynamic modulus of the material and improve the water stability to a certain
extent.Microscopic tests show that alkali slag is beneficial to the formation of
cementing material in the early stage,but the microscopic particles of cement-alkali
slag recycled materials are distributed in small clumps at the later stage,so the
integrity is not as good as cement recycled materials.The porosity of cement-alkali
slag recycled materials is larger,and the strength is weaker than that of cement
recycled materials.
译
关键词
碱渣; 水泥稳定半刚性再生基层材料; 力学性能; 水稳定性能; 微观分析
Keywords