摘要
为增强红黏土力学性能,利用偏高岭土对红黏土进行改良。针对偏高岭土地聚物改良红黏土进行无侧限抗压强度试验及渗透试验,分析碱激发剂模数、地聚物掺量对改良红黏土的无侧限抗压强度及渗透系数的影响,并进行最佳碱激发剂模数的改良红黏土的干湿循环试验,研究不同干湿循环次数对偏高岭土地聚物改良红黏土损伤规律。试验结果表明:改良红黏土无侧限抗压强度随碱激发剂模数的增大呈先增大后减小的趋势,当碱激发剂模数为1.2时,无侧限抗压强度最高;地聚物掺量越大,改良红黏土无侧限抗压强度越大;偏高岭土地聚物还可有效改善红黏土的渗透性,当碱激发剂模数为1.2时,改良红黏土的渗透系数为最小;干湿循环次数越多,改良红黏土的无侧限抗压强度越小,经过12次干湿循环试验后,改良红黏土无侧限抗压强度降低了20.7%。
The improvement of red clay was carried out by using kaolinite to improve the engineering properties of red clay.The effect of the modulus of the alkali exciter and the amount of the geopolymer on the unconfined compressive strength and permeability coefficient of the improved red clay was analyzed,and the dry and wet cycle tests of the improved red clay with the optimum modulus of the alkali exciter were carried out to analyze the extent of damage to the improved red clay by different dry and wet cycles of the alkali exciter.The test results showed that the unconfined compressive strength of the improved red clay tended to increase and then decrease with the increase of the modulus of the alkali exciter,and was greatest when the modulus of the alkali exciter was 1.2;the greater the dose of the geopolymer,the greater the unconfined compressive strength of the improved red clay;the kaolin geopolymer could effectively reduce the permeability coefficient of the red clay,and the permeability coefficient of the improved red clay was the smallest when the modulus of the alkali exciter was 1.2,and the decrease was the greatest.The higher the number of wet and dry cycles,the lower the unconfined compressive strength of the modified red clay and the greater the damage,and after 12 wet and dry cycles,the strength damage of the modified red clay was 20.7%.
作者
何艳春
章孝建
成岗
HE Yanchun;ZHANG Xiaojian;CHENG Gang(Hunan Road&Bridge Construction Group Co.,Ltd.,Changsha 410018,China;CCCC Northland Engineering Consulting Co.,Ltd.,Hohhot 010000,China)
出处
《交通科学与工程》
2023年第3期46-51,共6页
Journal of Transport Science and Engineering
关键词
偏高岭土地聚物
红黏土
碱激发剂模数
干湿循环
力学性能
metakaolin geomorphs
red clay
alkali exciter modulus
wet and dry cycles
mechanical properties
