谭波，李杰敏，张磊，等.大掺量矿物掺合料自密实混凝土的制备及研究[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2024100003.

TAN B，LI J M，ZHANG L，et al．Preparation and study of self-compacting concrete with large amount of mineral admixture［J］. Journal of Henan Polytechnic University( Natural Science)， doi: 10.16186/j.cnki.1673-9787.2024100003.

大掺量矿物掺合料自密实混凝土的制备及研究(网络首发)

谭波1,2，李杰敏1,2，张磊3，黎官福1,2，明阳1,2

1.桂林理工大学 土木工程学院，广西 桂林541004；2.桂林理工大学 广西绿色建材与建筑工业化重点实验室，广西 桂林 541004；3.中交路桥南方工程有限公司，北京 101100

摘要：目的 为制备大掺量矿物掺合料自密实混凝土并探讨粉煤灰、矿粉、超细石灰石粉掺量对其性能的影响规律。方法 对大掺量粉煤灰复掺矿粉及大掺量粉煤灰复掺超细石粉的自密实混凝土开展了试验研究，重点考察其工作性能、耐久性能、抗压强度和微观性能。结果 试验结果表明：30%粉煤灰（替代水泥质量比例）复掺15%矿粉、30%粉煤灰复掺15%超细石粉的自密实混凝土的坍落扩展度较纯水泥分别提高了14.6%和12.3%，坍落度分别提高了23.0%和18.6%；从7 d到28 d龄期，30%粉煤灰复掺15%矿粉、30%粉煤灰复掺5%超细石粉的抗压强度增长率分别比纯水泥提高了27.5%和16.7%；28 d龄期时，30%粉煤灰复掺矿粉、30%粉煤灰复掺超细石粉的自密实混凝土碳化深度较纯水泥均有所增加，84 d龄期时，30%粉煤灰复掺15%矿粉、30%粉煤灰复掺5%超细石粉的自密实混凝土氯离子扩散系数较纯水泥分别降低了35.6%，28.9%；微观结构观察可知大掺量矿物掺合料与水泥水化产物发生了不同程度二次水化反应。结论 30%粉煤灰复掺矿粉、复掺超细石粉的自密实混凝土的工作性能与纯水泥相比提升明显；28 d龄期时，30%粉煤灰复掺矿粉、30%粉煤灰复掺适量超细石粉的自密实混凝土与纯水泥的抗压强度相近；在各龄期下，30%粉煤灰复掺矿粉、复掺超细石粉的自密实混凝土抗碳化能力较纯水泥有所降低，30%粉煤灰复掺矿粉、复掺适量超细石粉的自密实混凝土抗氯离子渗透性能较纯水泥有所提升；30%粉煤灰复掺20%矿粉的自密实混凝土二次水化作用明显，填充了其结构内部的微裂缝和孔洞。

关键词：自密实混凝土；工作性能；耐久性能；抗压强度；微观形貌；矿物掺合料

doi: 10.16186/j.cnki.1673-9787.2024100003

基金项目:国家自然科学基金资助项目（52368030）

收稿日期：2023-10-08

修回日期：2024-11-14

网络首发日期：2026-07-22

Preparation and study of self-compacting concrete with large amount of mineral admixture

Tan Bo1,2,Li Jiemin1,2,Zhang Lei3, Li Guanfu1,2，Ming Yang1,2

1. School of Civil Engineering, Guilin University of Technology Guilin 541004, Guangxi, China;2. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin University of Technology, Guilin 541004, Guangxi, China;3. China Communications Road and Bridge South Engineering Co., Ltd., Beijing 101100, China

Abstract: Objectives In order to prepare self-compacting concrete with large dosage of mineral admixture and to explore the influence of the dosage of fly ash, mineral powder and ultrafine limestone powder on its performance. Methods An experimental study was carried out on self-compacting concrete with large admixture of fly ash compounded with mineral powder and large admixture of fly ash compounded with ultrafine limestone powder, focusing on its workability, durability, compressive strength and microscopic properties. Results The experimental results showed that the slump extension of self-compacting concrete with 30% fly ash (replacement of cement mass) compounded with 15% mineral powder and 30% fly ash compounded with 15% ultrafine limestone powder increased by 14.6% and 12.3%, and the slump increased by 23.0% and 18.6% respectively compared with that of pure cement; from the age of 7 d to 28 d, the growth rate of compressive strength of 30% fly ash mixed with 15% mineral powder and 30% fly ash mixed with 5% ultrafine limestone powder increased by 27.5% and 16.7% respectively, compared with that of pure cement; At the age of 28 d, the carbonation depth of self-compacting concrete with 30% fly ash mixed with mineral powder and 30% fly ash mixed with ultrafine limestone powder increased compared with pure cement, At the age of 84 d, the chloride migration coefficient of self-compacting concrete with 30% fly ash compounded with 15% mineral powder and 30% fly ash compounded with 5% ultrafine limestone powder were reduced by 35.6% and 28.9%, respectively, compared with pure cement; microstructural observation shows that the large dosage of mineral admixtures had different degrees of secondary hydration reactions with cement hydration products. Conclusions The working performance of self-compacting concrete with 30% fly ash compounded with mineral powder and ultrafine limestone powder was significantly improved compared with that of pure cement; the compressive strength of self-compacting concrete with 30% fly ash compounded with mineral powder and 30% fly ash compounded with an appropriate amount of ultrafine limestone powder was similar to that of pure cement at the age of 28 d. at all ages, the carbonation resistance of self-compacted concrete with 30% fly ash compounded with mineral powder and appropriate amount of ultrafine limestone powder is lower than that of pure cement,while chlorine ion penetration resistance of self-compacting concrete with 30% fly ash mixed with mineral powder and appropriate amount of ultrafine limestone powder is improved compared with pure cement.; the secondary hydration of self-compacted concrete with 30% fly ash compounded with 20% of mineral powder is obvious, which fills up the microcracks and holes inside its structure.

Key words: self-compacting concrete; workability; durability; compressive strength; micromorphology; mineral admixtures