摘要
石灰石-烧黏土水泥是一类典型的低碳材料。固定水泥中烧黏土与石灰石含量比例为2∶1,设置水泥取代率为40%、50%、60%,系统研究砂浆材料的抗压强度、抗折强度及吸水性特征,并从微结构角度分析性能形成机制。结果显示,在力学性能方面,50%、60%取代率试样抗折强度较纯水泥砂浆分别提升12%、13%,40%取代率试样虽强度较低但韧性更优。在抗压强度方面,烧黏土和石灰石复掺取代水泥40%时,砂浆28 d抗压强度最高,约为纯水泥砂浆强度的87%;50%和60%取代率时,28 d抗压强度分别降至纯水泥的79%、75%。石灰石-烧黏土水泥砂浆早期吸水率高于纯水泥砂浆,但28 d时吸水率低于纯水泥砂浆;LC^(3)胶凝体系水化反应消耗Ca(OH)_(2),使得砂浆结构更加密实,纤维状水化产物增加了材料韧性。
Limestone calcined clay cement is a typical low-carbon material.In this study,the mass ratio of calcined clay to limestone in cement was fixed at 2:1,and the cement substitution rate were set at 40%,50%and 60%,respectively.The compressive strength,flexural strength and water absorption characteristics of mortar materials were systematically studied,and the performance formation mechanism was analyzed from the perspective of microstructure.The results show that in terms of mechanical properties,the flexural strength of the specimens with 50%and 60%replacement rates is 12%and 13%higher than that of pure cement mortar respectively,while the specimen with 40%replacement rate has lower strength but better toughness.In terms of compressive strength,when the compound admixture of calcined clay and limestone replaces 40%of cement,the 28-day compressive strength of mortar is the highest,accounting for about 87%of that of pure cement mortar.When the replacement rates are 50%and 60%,the 28-day compressive strength decreases to 79%and 75%of that of pure cement mortar respectively.The early water absorption of the system is higher than that of the pure cement mortar,but the water absorption at 28-day is lower than that of the pure cement mortar.The hydration reaction of the system consumes Ca(OH)_(2)and densifies the mortar structure.Meanwhile,fibrous hydration products increase the toughness of the material.
作者
周楠楠
王洪飞
贾文杰
ZHOU Nannan;WANG Hongfei;JIA Wenjie(Shandong Urban Construction Vocational College,Jinan 250103,China;Housing and Urban-Rural Development Research Institute of Shandong Province,Jinan 250004,China)
出处
《建筑节能(中英文)》
2025年第12期106-109,共4页
Building Energy Efficiency
关键词
石灰石-烧黏土水泥
抗折强度
抗压强度
吸水性能
limestone-calcined clay cement
flexural strength
compressive strength
water absorption
