摘要
探究了输电塔基础结构所用轻质橡胶陶粒混凝土(LRC)在25~600℃下的质量损失、抗压强度衰减及界面微结构演化规律。结果表明:适量橡胶能够在高温劣化后显著提升陶粒混凝土的延性与耗能能力,其中掺入10%橡胶颗粒的轻质陶粒混凝土(LRC-10)在全温度区间均表现出最低质量损失率及最高残余强度与弹性模量保持率,耐高温性能最优。纳米压痕结果进一步揭示橡胶-陶粒体系的高温作用机制,即橡胶在200~400℃的软化与分解形成内部释压通道,减缓蒸汽压力集中。同时改善了界面过渡区(ITZ)初始致密性并延缓C-S-H凝胶退化,从而增强材料在高温后的结构完整性与力学韧性。
The degradation patterns of lightweight rubber-modified ceramsite concrete(LRC)used in transmission-tower foundation structures with respect to mass loss,compressive-strength attenuation,and interfacial microstructure evolution were investigated under a temperature range from 25 C to 600 C.The results indicate that an appropriate amount of rubber can significantly enhance the post-high-temperature ductility and energy dissipation capacity of ceramsite concrete.Among all mixtures,the specimen with 10%rubber replacement(LRC-10)exhibited the lowest mass loss and the highest retention of residual strength and elastic modulus across the entire temperature range,demonstrating superior thermal resistance.Nanoindentation further revealed the high-temperature mechanism of the rubber ceramsite system,the softening and decomposition of rubber at from 200 C to 400 C create internal pressure-relief channels that mitigate steam-pressure concentration.Meanwhile,rubber improves the initial density of the interfacial transition zone(ITZ)and delays the degradation of C-S-H gels,thereby enhancing the structural integrity and mechanical toughness of the material after thermal exposure.
作者
孙广通
周峰宇
杨飞
钟步添
冯万辉
李红中
SUN Guangtong;ZHOU Fengyu;YANG Fei;ZHONG Butian;FENG Wanhui;LI Hongzhonga(Guangzhou Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Guangzhou 510620,China;School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China;College of Urban and Rural Construction,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,China;School of Civil Engineering,Guangdong Communication Polytechnic,Guangzhou 510650,China)
出处
《混凝土》
北大核心
2026年第3期11-17,共7页
Concrete
基金
中国南方电网有限责任公司科技项目(GDKJXM20231138)
国家自然科学基金委员会(12072079)
广东省教育科学规划课题(2025GXJK0208)
广东省普通高校重点科研平台项目(2025KCXTD074,2024GCZX023,2023CJPT003)。
关键词
输电塔地基
橡胶增韧陶粒混凝土
高温劣化
纳米压痕
transmission tower foundation
rubber-modified ceramsite concrete
high-temperature degradation
nanoindentation
