生态型超高强混凝土的制备与性能研究  

Research on Preparation and Performance of Ecological Ultra-high Strength Concrete (UHSC)

作　　者：张志豪 余睿[2] 水中和[2] 王鑫鹏[2] 曾志军[3] 潘跃进[3] 

机构地区：[1]中铁大桥科学研究院有限公司,武汉430034 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,43007 [3]海军工程设计研究院,北京100070

出　　处：《混凝土与水泥制品》2018年第1期1-5,16,共6页China Concrete and Cement Products

基　　金：国家科技支撑计划资助(2014BAC01B02)

摘　　要：通过最紧密堆积理论设计了生态型超高强混凝土(UHSC),研究了粉煤灰、矿粉以及礁石粉对UHSC流变性能、抗压强度以及水化过程的影响,并对其环境影响进行了评价。结果表明,相比之下,矿粉的加入能够降低UHSC浆体的屈服应力与塑性黏度,提高UHSC的流动度,塑性黏度最低降到3.04Pa·s,UHSC流动度增加到304mm;矿粉对UHSC的早期和后期抗压强度提高较明显,分别提高了14.4%、10%,而粉煤灰、礁石粉会降低UHSC的早期强度;矿粉、粉煤灰以及礁石粉会延缓UHSC的水化反应过程,降低72h的水化放热总量,且降低UHSC对环境的影响。结合紧密堆积理论,采用辅助胶凝材料部分取代水泥、选择较低的减水剂掺量(2.5%)的方法可以制备出生态型超高强混凝土。An eco-friendly Ultra-High Strength Concrete （UHSC） is prepared based on the optimized particle packing model. The effects of fly ash, slag and coral powders on the rheological properties, compressive strength and hydration process of UHSC are studied, and the impacts of UHSC on the environmental is evaluated. The results show that the addition of slag can reduce the yield stress and plastic viscosity of UHSC, the minimum value of plastic viscosity can achieve 3.04Pa-s, and it can increase slump flow diameter of UHSC to 304mm; In contrast with reference mixtures, the designed UHSC with slag have higher early and later compressive strength, increased by 14.4%, 10% respectively, while mixtures with fly ash and coral powders have obvious decline in early strength development. The addition of slag, fly ash and coral powders can significantly delay the UHSC hydration reaction and reduce the total amount of hydration heat in 72hours, Moreover, the ecological evaluation demonstrates that the designed UHSC with slag, fly ash and coral powders has relatively low environmental impact. Combined with the optimized particle packing model, the auxiliary cementitious material partially replaces the cement and the relatively low dosages of superplasticizer （2.5%） can produce the ecological ultra high strength concrete.

关 键 词：超高强混凝土(UHSC) 最紧密堆积 环境影响 粉煤灰 矿粉 礁石粉 流变性能 浆体 

分 类 号：TU528.31[建筑科学—建筑技术科学]