天然浮石混凝土冻融损伤及寿命预测模型  

Freeze-Thaw Damage and Life Prediction Model of Natural Pumice Concrete

作　　者：王萧萧[1,2] 刘畅 尹立强 闫长旺 刘曙光 WANG Xiaoxiao;LIU Chang;YIN Liqiang;YAN Changwang;LIU Shuguang(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Engineering Research Center of Ecological Building Materials and Prefabricated Construction,Hohhot 010051,China;School of Mining Technology,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051 [2]生态型建筑材料与装配式结构内蒙古自治区工程研究中心,呼和浩特010051 [3]内蒙古工业大学矿业学院,呼和浩特010051

出　　处：《硅酸盐通报》2021年第1期98-105,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51609119);内蒙古自治区高等学校“青年科技英才支持计划”(NJYT-18-B24)。

摘　　要：内蒙古地区天然浮石资源丰富,可作为粗骨料制作轻质混凝土。为了研究天然浮石混凝土冻融损伤规律,配制了五种配合比的试件进行快速冻融试验。通过天然浮石混凝土相对动弹性模量和质量损失变化规律,分析了浮石骨料对混凝土抗冻性的影响。基于静水压力理论和疲劳损伤理论,推导出天然浮石混凝土的材料系数,进而建立了冻融损伤模型和寿命预测模型,并作为实例,考察了内蒙古巴彦淖尔市冬季低温环境下的天然浮石混凝土寿命。结果表明:浮石骨料能减小混凝土静水压力,提高抗冻性;天然浮石混凝土相对动弹性模量计算值与试验值吻合较好;五组天然浮石混凝土寿命预测值分别达到65 a、84 a、112 a、131 a和50 a,满足安全性运行年限。Inner Mongolia is rich in natural pumice,which can be used as coarse aggregate of lightweight aggregate concrete.In order to study the freeze-thaw damage law of natural pumice concrete(NPC),the freeze-thaw test was carried out on specimens with five kinds of mixing ratios.The relative dynamic elastic modulus and mass loss of NPC were obtained,and then the influence of pumice aggregate on the concrete frost resistance was analyzed.Based on the hydrostatic pressure theory and the fatigue damage theory,the material coefficient of NPC was deduced,the freeze-thaw damage model and life prediction model of NPC were established,and as an example,the life of NPC in Bayannur,Inner Mongolia in winter was calculated.The results show that pumice aggregate reduces the hydrostatic pressure of concrete and improves its frost resistance.The calculated value of relative dynamic modulus of the NPC is in great agreement with the test value.The life expectancy values of five groups of NPC reach 65 a,84 a,112 a,131 a and 50 a,meeting the safety operation life.

关 键 词：天然浮石混凝土 冻融损伤 相对动弹性模量 寿命预测 

分 类 号：TU528.2[建筑科学—建筑技术科学]