Effects of mixture design parameters on the properties of belitic calcium sulfoaluminate concrete

IF 1.8 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
I. Aguilar Rosero, E.O. Soriano Somarriba, B. Farivar, C.D. Murray
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Abstract

Belitic calcium sulfoaluminate (BCSA) cement has well-established advantages such as a fast setting time, fast strength gain, long-term strength, shrinkage and sustainability. BCSA cement reaches an initial set in about 15 min at room temperature and can reach compressive strengths of over 27 MPa in about 2 h. While it can be mixed in a similar fashion to Portland cement (PC), a set retarder (such as citric acid) is usually required to achieve adequate working time and the design of mixtures differs slightly from PC designs. This paper provides guidance on establishing mix design criteria for BCSA cement. Slump and compressive strength studies measurements were taken for varying mixture proportions with strengths measured up to 1 year of hydration. For BCSA concrete mixtures, a relationship between water content and slump was established. Citric acid was found to increase the slump, especially at lower water contents. A relationship between setting time and citric acid dosage was proposed on the basis of mortar penetrometer and Vicat needle tests. X-ray diffraction analysis was also conducted on BCSA cement pastes with different water/cement (w/c) ratios. Crystalline structure growth was found to be directly related to the w/c ratio and inversely proportional to compressive strength.
配合比设计参数对贝理石型硫铝酸钙混凝土性能的影响
白石质硫铝酸钙(BCSA)水泥具有固化时间快、强度增益快、强度长期稳定、收缩率高、可持续性好等优点。BCSA水泥在室温下约15分钟达到初凝,约2小时可达到27 MPa以上的抗压强度。虽然BCSA水泥的混合方式与波特兰水泥(PC)类似,但通常需要使用固定缓凝剂(如柠檬酸)来达到足够的工作时间,并且混合物的设计与PC设计略有不同。本文为建立BCSA水泥配合比设计准则提供了指导。坍落度和抗压强度研究测量采取了不同的混合比例的强度测量到1年的水化。对于BCSA混凝土配合比,建立了含水量与坍落度之间的关系。柠檬酸增加了坍落度,特别是在含水量较低的情况下。在砂浆渗透仪和维卡针试验的基础上,提出了凝结时间与柠檬酸用量的关系。对不同水灰比(w/c)的BCSA水泥浆体进行了x射线衍射分析。晶体结构的生长与w/c比成正比,与抗压强度成反比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Magazine of Concrete Research
Magazine of Concrete Research 工程技术-材料科学:综合
CiteScore
4.60
自引率
11.10%
发文量
102
审稿时长
5 months
期刊介绍: For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.
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