摘要
通过对不同煤矸石陶粒掺量(0、20%、40%、60%)的混凝土进行快速冻融循环试验,探究了冻融循环后煤矸石陶粒混凝土的表面劣化、质量损失率和相对动弹性模量的变化规律,以不同冻融循环次数下煤矸石陶粒混凝土的动弹性模量为损伤变量,建立了煤矸石陶粒混凝土冻融损伤劣化模型,并对其在自然冻融环境下的寿命进行了预测。研究结果表明,随着冻融循环次数的增加,煤矸石陶粒混凝土的抗冻性能逐渐降低,但降低幅度有所不同;随着煤矸石陶粒取代率的增加,混凝土的抗冻性能呈现先下降后提高再下降的趋势;建立的煤矸石陶粒混凝土冻融损伤劣化模型与试验结果符合较好,具有较高的精度;当煤矸石陶粒掺量为40%时,混凝土的抗冻性能效果最佳,抗冻耐久性寿命最长。
The rapid freeze-thaw cycling tests of concrete blocks with different content of coal gangue ceramsite(0,20%,40%,60%)were carried out to study the variation regularities of surface deterioration,mass loss rate and relative dynamic elastic modulus of coal gangue ceramsite concrete after freeze-thaw cycling,and the dynamic elastic modulus of coal gangue ceramsite concrete with different freeze-thaw cycles was used as the damage variable and the freeze-thaw damage deterioration model of coal gangue ceramsite concrete was established and its life under natural freeze-thaw environment was predicted.The results show that with the increase of freeze-thaw cycles,the frost-resistance of coal gangue ceramsite concrete decreases gradually,but the decreasing range is different.With the increase of the replacement rate of coal gangue ceramsite,the frost-resistance of concrete decreases first,then increases and then decreases.The freeze-thaw damage deterioration model of coal gangue ceramsite concrete is in good agreement with the experimental results and has high accuracy.When the content of coal gangue ceramsite is 40%,the frost-resistance of concrete is the best,and the life of frost-resistance is the longest.
作者
邱继生
王斌
关虓
熊光红
秦卿
QIU Ji-sheng;WANG Bin;GUAN Xiao;XIONG Guang-hong;QIN Qing
出处
《混凝土与水泥制品》
北大核心
2019年第11期61-65,共5页
China Concrete and Cement Products
基金
国家自然科学青年科学基金项目（51808443）
陕西省自然科学基础研究计划面上项目（2018JM5167）
中国博士后科学基金（2017M613166）
关键词
煤矸石陶粒混凝土
抗冻性能
损伤劣化模型
寿命预测
Coal gangue ceramsite concrete
Fros-resistance
Damage evolution model
Life prediction
