澳洲膨润土与高岭石基石灰石煅烧粘土胶结物水化动力学及相发育差异

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Munib Ul Rehman, Alastair J. N. MacLeod, Laurie Aldridge, Frank G. Collins, Zhao Qing Tang, Will P. Gates
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引用次数: 0

摘要

鉴于目前全球向低碳经济的转变,替代补充胶凝材料,如煅烧粘土,预计将在减少混凝土行业的碳含量方面发挥巨大作用。用一种独特的高纯澳洲膨润土(CB)和中低纯度高岭土(MK)配制石灰石-煅烧粘土水泥(LC3),对其性能进行了评价。在长达90天的养护后,研究了膏体的反应动力学、抗压强度和相发展以及吸水率和吸附性。所有LC3混合物的水化反应都比OPC快,释放的热量更少,硅酸盐和铝酸盐水化反应的事件不同。与OPC相比,粘土矿物的结构和组成的差异导致水化相形成明显不同,例如,在cb基混合物中二氧化硅多50-55%,碱氧化物多2倍,在mk基糊状物中氧化铝多60-90%。对于本文使用的混合设计,基于cb的LC3的早期(3天和7天)强度超过基于mk的LC3,几乎等于对照OPC;CB- LC3的28天抗压强度也与OPC相当。在cb基LC3中发现了更多的波特兰石消耗和钙矾石形成,而在mk基LC3中观察到更多的碳铝酸盐和单硫酸盐。cb基LC3的吸水率和吸附性也最低,这被解释为由于连接孔隙率较低。结果表明,替代的本地粘土矿物可用于生产低熟料水泥。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Differences in hydration kinetics and phase development of Australian bentonite and kaolinite based limestone calcined clay cements

Given the current global shift towards a lower carbon economy, alternative supplementary cementitious materials, such as calcined clays, are expected to have huge role in reducing the embodied carbon of the concrete industry. The performance of limestone-calcined-clay cements (LC3) made with a unique, high purity Australian bentonite clay (CB) and with low-to-medium purity kaolin clays (MK) was evaluated. Reaction kinetics, compressive strength and phase development together with water absorption and sorptivity of pastes were examined after curing for up to 90 days. All LC3 mixes underwent faster hydration reactions than OPC, releasing less heat with distinct events for silicate and aluminate hydration. Compared to OPC, differences in the structure and composition of clay minerals e.g. 50–55% more silica and 2-times more alkali oxides in CB-based mixes and 60–90% more alumina in MK-based pastes resulted in distinctly different phase formation on hydration. For the mix design used herein, the early (3- and 7-day) strength of CB-based LC3 exceeded that of the MK-based LC3 and nearly equaled the control OPC; the 28-day compressive strength of CB- LC3 was also comparable to that of OPC. Greater portlandite consumption as well as ettringite formation was exhibited in the CB-based LC3, while greater amounts of carboaluminate and monosulphate were observed in the MK-based LC3. Water absorption and sorptivity was also lowest in CB-based LC3 and is interpreted to be due to lower connected porosity. The results demonstrate that alternative local clay minerals can be suitable for producing low-clinker cements.

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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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