摘要
研究了相近强度等级(LC40)下预置轻骨料混凝土与普通轻骨料混凝土的物理性能与耐久性能。结果表明:相同强度等级下,预置轻骨料混凝土密度较普通轻骨料混凝土降低约200 kg/m^(3);同时具有更好的匀质性(上下质量差仅为0.14%,普通轻骨料混凝土为1.68%)与体积稳定性(干缩为普通轻骨料混凝土的1/3)。但由于轻骨料自身强度与弹性模量低,相同强度等级预置轻骨料混凝土的脆性增大,抗折强度与弹性模量降低;并且大量轻骨料堆积提供水分与离子传输通道,抗氯离子扩散性能以及抗冻性能也会降低。
The physical properties and durability of preplaced lightweight aggregate concrete and ordinary lightweight aggregate concrete with similar strength grade(LC40)are studied.The results show that under the same strength grade,the density of preplaced lightweight aggregate concrete is about 200 kg/m'lower than that of ordinary lightweight aggregate concrete.At the same time,it has better homogeneity(the difference between the upper and lower mass is only 0.14%,and that of ordinary lightweight aggregate concrete is 1.68%)and volume stability(the dry shrinkage is 1/3 of that of ordinary lightweight aggregate concrete).However,due to the low strength and elastic modulus of lightweight aggregate,the brittleness of lightweight aggregate concrete with the same strength grade increases while the flexural strength and elastic modulus decrease.In addition,accumulating a large amount of lightweight aggregate provides water and ion transmission channels,and the chloride ion diffusion and frost resistance will also decrease.
作者
彭波
李文
董贤政
盛楚鸣
刘云鹏
PENG Bo;LI Wen;DONG Xianzheng;SHENG Chuming;LIU Yunpeng(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;The Third Construction Co.,Ltd.,of China Construction Third Engineering Bureau,Wuhan 430070,China)
出处
《混凝土》
CAS
北大核心
2024年第9期35-39,共5页
Concrete
基金
国家重点研发计划项目(2021YFC3100800)
国家自然科学基金(51972250)
中央高校基本科研业务费专项资金(2020III005JL)。
关键词
轻骨料混凝土
预置骨料混凝土
力学性能
耐久性
lightweight aggregate concrete
preplaced aggregate concrete
mechanical properties
durability
