摘要
通过在两种黏性土中分别掺入不同配合比的阻水剂,制备成试样,进行吸水率、无侧限抗压强度测试和不同次数冻融循环条件后的力学试验。结果表明:在塑性指数大于15的黏性土中掺入15%的胶凝剂+配合比为1%~2%的阻水剂,改良土的吸水率是未加阻水剂的10%~20%。改良土试样的无侧限抗压强度随冻融循环次数的增加衰减较小,24次冻融循环后的无侧限抗压强度损失率在10%以内,而未改良土强度损失率高达50%以上。另外,含阻水剂的改良土试样受多次冻融循环后的质量变化率均小于5%。
It was conducted by mixing different ratios of water-blocking agents into two types of clay soils to prepare specimens for water absorption,unconfined compressive strength test and undergoing mechanical test after different number of freeze-thaw cycles.The results show that the water absorption rate of the improved soil formed by mixing 15%of gelling agent+water blocking agent with the ratio of 1%-2%in the clay soil with plasticity index more than 15 was 10%-20%of that without water resist.The unconfined compressive strength of the modified soil specimens decreased less with the increase of freeze-thaw cycles,and the loss of unconfined compressive strength after 24 freeze-thaw cycles was within 10%,while the loss of strength of the unimproved soil was more than 50%.In addition,the mass change rate of the modified soil sample with water-barrier was less than 5%after undergoing several freeze-thaw cycles.
作者
胡峰
朱汉华
徐璟
黄冲
HU Feng;ZHU Hanhua;XU Jing;HUANG Chong(Zhejiang Institute of Communications Co.,Ltd.,Hangzhou 310012,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《路基工程》
2023年第3期6-12,共7页
Subgrade Engineering
基金
第二次青藏高原综合科学考察研究(2019QZKK0904)
国家自然科学基金面上项目(42277132)
浙江省重点研发计划(2021C03159,2021KCKT2011)。
关键词
寒区路基
阻水改良土
抗冻性能
胶凝剂+阻水剂掺量
无侧限抗压强度
吸水率
质量损失率
subgrade in cold regions
water-blocking modified soil
frost resistance
gelling agent and water blocking agent dosage
unconfined compressive strength
water absorption
mass loss rate
