硬化水泥砂浆热膨胀系数影响因素  

Study on Influence Parameters of Thermal Expansion Coefficient of Hardened Mortar

作　　者：闫东星 Yan Dongxing(Inner Mongolia traffic design research institute limited liability company,Hohhot 010010,China)

机构地区：[1]内蒙古交通设计研究院有限责任公司,内蒙古呼和浩特010010

出　　处：《湖南科技大学学报（自然科学版）》2020年第3期45-49,共5页Journal of Hunan University of Science And Technology：Natural Science Edition

摘　　要：热膨胀性能是影响水泥基材料温度变形和开裂的重要指标.通过对硬化砂浆不同龄期热膨胀系数的测定,研究了水胶比、胶集比、矿物掺合料种类、粉煤灰掺量和细集料种类对砂浆热膨胀系数的影响规律.结果表明,硬化砂浆的热膨胀系数随水胶比和胶集比的增加而增大,其本质区别是用水量和水泥用量增加导致的水泥石热膨胀系数变化.矿粉能够增加砂浆的热膨胀系数,而粉煤灰则起抑制作用,热膨胀系数随着粉煤灰掺量的增加而降低.在对砂浆热膨胀系数的降低效果方面,大理岩砂>玄武岩砂>砂岩砂>天然砂.Thermal expansion is a key parameter on anti-thermal deformation and cracking within cementitious materials.The influences of cement binder ratio,binder aggregate ratio,mineral admixture type,fly ash content and fine aggregate type on thermal expansion coefficient of hardened mortar were studied.The results showed that the thermal expansion coefficient increased with cement binder ratio increasing and binder aggregate ratio increasing.The slag promote the thermal expansion increasing,while the fly ash show inhibitory effect.The thermal expansion coefficient decrease with fly ash content increasing.Different fine aggregate show different decreasing effect on thermal expansion coefficient.The mortar compose marble fine aggregate showlarger thermal expansion coefficient than basalt,sandstone and river aggregate.

关 键 词：砂浆 热膨胀系数 水胶比 胶集比 掺合料 

分 类 号：TU528.01[建筑科学—建筑技术科学]