雷谱春



文章编号:1000033X(2016)12007203
收稿日期:20160518
摘要:为研究材料组成对半刚性基层强度的影响,对不同无机结合料组合的半刚性基层材料进行室内无侧限抗压强度试验及抗压回弹模量试验。结果表明:三灰砂砾抗压强度与水泥用量具有较好的相关性,并且随着水泥替代量的增大强度显著提高;随着龄期及水泥用量的增大,各材料抗压回弹模量均增长,水泥稳定类材料较二灰类材料增长更为显著。相关性研究结果可为预测半刚性材料强度增长规律提供参考。
关键词:半刚性材料;抗压强度;抗压回弹模量;抗裂性能
中图分类号:U416.1文献标志码:B
Experimental Study on Crack Resistance of Semirigid Materials
LEI Puchun
(Shaanxi Provincial Communications Construction Group, Xian 710075, Shaanxi, China)
Abstract: In order to study the effect of material composition on the strength of semirigid base, the indoor unconfined compressive strength test and resilient modulus test were carried out for semirigid base materials with different combinations of inorganic binders. The results show that the compressive strength of the combination of cement, lime, fly ash and gravel has a good correlation with the amount of cement, and the strength increases when more cement is added. With the increase of the age and amount of cement, the resilient modulus of materials increases, which is more obvious in semirigid base stabilized with cement. The correlation findings also provide reference to the strength growth prediction of semirigid materials.
Key words: semirigid material; compressive strength; resilient modulus; crack resistance
0引言
半刚性材料主要是在粉碎的或原状松散的土中掺入一定量的无机结合料(包括水泥、石灰、粉煤灰或工业废渣等),并与水混合,经过拌和、压实、养生之后得到的道路基层材料,一般有二灰稳定类和水泥稳定类基层。但目前对于二灰稳定类和水泥稳定类组合成的水泥、石灰、粉煤灰稳定类基层的研究并不多;另外,对于这种新组合来说,它是否继承了两者的特性与优点以及避开了两者的缺点还有待研究。因此对水泥、石灰、粉煤灰稳定类以及二灰稳定类、水泥稳定类这些半刚性材料的抗裂性能进行进一步分析研究,具有十分重要的意义[13]。本文通过确定水泥、石灰、粉煤灰3种材料的配比组成和最佳比例,对水泥稳定类、二灰稳定类和水泥、石灰、粉煤灰稳定类半刚性材料的抗裂性能进行深入研究。……