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大掺量矿渣蒸压加气混凝土微观形貌及强度研究
作者：宋起运1，胡荻1，白建飞2，朱志伟3，李英4，晋强1
（1.新疆农业大学 水利与土木工程学院，新疆 乌鲁木齐 830052；
2.乌鲁木齐市建筑建材科学研究院，新疆 乌鲁木齐 830000；
2.乌鲁木齐市建筑建材科学研究院，新疆 乌鲁木齐 830000；
3.新疆八一钢铁股份有限公司，新疆 乌鲁木齐 830000；4.新疆维吾尔自治区钢铁行业协会，新疆 乌鲁木齐 830000）
摘要：以水泥、矿渣粉、粉煤灰为三因素设计L9（34）正交试验，研究不同养护制度下大掺量矿渣加气混凝土水化产物的微观形貌与强度之间的关系。试验结果表明：标准养护条件下生成少量小片状的Ca（OH）2和零星团簇状双碱C-S-H凝胶，分布不均匀，填充性差，存在连通孔；蒸汽养护条件下生成少量针状的C-S-H凝胶和片状托勃莫来石，结构较为疏松；蒸压条件下生成的C-S-H与托勃莫来石层包裹于孔外壁，孔内有托勃莫来石层支撑，将孔形成“零密度”的“骨料”，如中空的“刚性球”，具有均分应力的作用，宏观表现为制品的强度较高。
关键词：矿渣；加气混凝土；微观形貌；强度机理
中图分类号：TU528.2 文献标识码：A 文章编号：1001-702X（2020）02-0100-05
The analysis of microstructure and strength mechanism of autoclaved aerated concrete with a large quantity of slag addition
SONG Qiyun1，HU Di1，BAI Jianfei2，ZHU Zhiwei3，LI Ying4，JIN Qiang1
（1.College of Water Resources and Civil Engineering，Xinjiang Agricultural University，Urumqi 830052，China；2.Urumqi Institute of Building Materials Research，Urumqi 830000，China；3.Xinjiang Bayi Iron and Steel Co. Ltd，Urumqi 830000，China；
4.Xinjiang Uygur Autonomous Region Iron and Steel Industry Association，Urumqi 830000，China）
Abstract：Taking the cement，slag powder and fly ash as the three factors，the L9（34） orthogonal test is designed，which ex-
plores the relationship between the microstructure and strength mechanism of hydration products of aerated concrete with a large quantity of slag addition under different curing systems. The test results show that：A small amount of patchy Ca（OH）2 and sporadic
cluster-like double alkali C-S-H gels were produced under standard curing condition，with uneven distribution，poor filling and connected pores. A small amount of spicelike C-S-H gel and flaky tobermorites were formed under steam curing condition，and the structure is relatively loose. C-S-H and tobermorites layer generated under autoclaved curing condition are spreading on the exterior wall of the pores，and inside the pores there exist tobermorites as some support，which makes the pores into "zero density" "aggregate"，equal to the hollow "rigid ball"，with the function of distributing stress evenly，and leading to the results that the strength of the product is high in terms of the macroscopic performance.
Key words：slag，aerated concrete，microstructure，strength mechanism