摘要
水泥基材料超低温下的性能与其常温及低温下有很大差异。测量了不同砂浆的抗压抗折强度、相对动弹模量、相对质量损失率和含水率,研究了水融过程中吸水量、水灰比和最初含水率对砂浆抗超低温(-110℃)冻融性能的影响。结果表明:砂浆试样超低温冻融破坏比普通冻融破坏更加严重、迅速,且砂浆试样的抗折强度对超低温冻融更加敏感。试样在超低温冻融过程中逐渐从外界吸水,经过21次超低温冻融循环后,其吸水量甚至大于在真空饱水机中的吸水量。
The properties of mortars at cryogenic temperature are different from those at room temperature or at low temperature.The compressive strength,flexural strength,relative dynamic elastic modulus,relative mass loss and water content of different types of mortars were measured at cryogenic temperature（-110 ℃）.The influences of water absorbed in thawing period,water to cement ratio and the initial water content on the frost resistance of mortars suffering cryogenic freeze-thaw cycles were investigated.The results show that the flexural strength of mortars is sensitive to the cryogenic freeze-thaw cycles.Samples gradually absorb water from the outside in the freeze-thaw process,and the amount of water absorbed is even greater than that absorbed by vacuum saturation.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2014年第5期596-600,共5页
Journal of The Chinese Ceramic Society
基金
国家重点基础研究发展计划(2011CB013805)
国家自然科学基金(51278360、51308407)
国家科技支撑计划(2014BAL03B02、2012BAJ20B02)
高等学校博士学科点专项科研基金(20130072110047)
中央高校基本科研业务费专项资金资助
关键词
冻融循环
超低温
砂浆
水灰比
含水率
freeze-thaw cycles
ultra low temperature
mortar
water to cement ratio
water content
