摘要
以偏高岭土、一级粉煤灰和矿渣为原料,选择LiOH为碱激发剂,制备了不同LiOH掺杂量(1%,3%,5%,7%(质量分数))的粉煤灰地聚物混凝土。研究了LiOH掺杂量对粉煤灰地聚物混凝土力学性能和抗冻性能的影响。结果表明,掺入碱激发剂LiOH促进了地聚物混凝土中活性硅和活性铝发生反应,生成的凝胶数量增多,提高了混凝土的致密度;当LiOH的掺杂量为5%时,混凝土的抗压强度和抗折强度达到了最大值,分别为48.91和5.56 MPa;适量LiOH的添加提高了混凝土的热稳定性和抗冻性能,在950℃,当LiOH的掺杂量为5%时,混凝土的失重最低仅为3.9%;冻融循环100次时,LiOH的掺杂量为5%的混凝土的质量损失率最低为0.93%,相对动弹性模量最大为88.24%,抗冻性能最佳。综合分析可知,LiOH的最佳掺杂量为5%。
Fly ash geopolymer concrete with different LiOH doping amounts(1 wt%,3 wt%,5 wt%,7 wt%)was prepared using metakaolin,level I fly ash,and slag as raw materials,and LiOH as alkali activator.The influence of LiOH content on the mechanical properties and frost resistance of fly ash geopolymer concrete was studied.The results show that the addition of alkali activatorLiOH promotes the reaction of activated silicon and activated aluminum in geopolymer concrete,increases the amount of gel generated,and improves the density of concrete.When the doping amount of LiOH is 5 wt%,the compressive strength and flexural strength of concrete reach their maximum values,which are 48.91 and 5.56 MPa,respectively.The addition of an appropriate amount of LiOH improves the thermal stability and frost resistance of concrete.At 950℃,when the LiOH doping amount is 5 wt%,the minimum weight loss of concrete is only 3.9%.When the freeze-thaw cycle is 100 times,the minimum mass loss rate of concrete with 5 wt%LiOH doping is 0.93%,and the maximum relative dynamic elastic modulus is 88.24%,indicating the best frost resistance performance.Comprehensive analysis shows that the optimal doping amount of LiOH is 5 wt%.
作者
方明伟
王丹
周枫桃
李荣杰
FANG Mingwei;WANG Dan;ZHOU Fengtao;LI Rongjie(School of Architecture and Engineering,Hulunbuir University,Hulunbuir 021008,China)
出处
《功能材料》
CAS
CSCD
北大核心
2023年第11期11170-11176,共7页
Journal of Functional Materials
基金
国家自然科学基金地区科学基金项目(12261032)
内蒙古自治区重点研发和成果转化计划项目(2022YFDZ0085)
内蒙古自治区高等学校科学技术研究项目(NJZY22294)
呼伦贝尔学院校级服务地方重点项目(2022FDZD03)。
关键词
碱激发剂
粉煤灰
地聚物
混凝土
力学性能
抗冻性能
alkaline activator
fly ash
geopolymer
concrete
mechanical properties
frost resistance
