煅烧天然沸石对水泥基材料水化动力学和收缩的影响

IF 1.4 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Advances in Civil Engineering Materials Pub Date : 2024-07-22 DOI:10.1520/acem20220119
M. S. Islam, Benjamin J. Mohr
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引用次数: 0

摘要

以往的文献提供了相互矛盾的结果,因此我们进行了本次调查,以提供更多信息,评估使用浸泡煅烧作为预处理方法来提高煅烧沸石作为胶凝补充材料的性能是否合适。在这项研究中,天然沸石分别在 200°C、400°C、600°C、800°C 和 1,000°C 下煅烧了三个小时,并通过一系列实验测试观察了煅烧对不同物理和化学特性的影响。研究了煅烧沸石在水化体系中对水化动力学(即水化热、凝结时间、化学收缩、水化程度)、干燥收缩和抗压强度的影响,其中硅酸盐水泥的替代率高达 20%。结果表明,煅烧略微降低了沸石的结晶度、粒度和峰值孔径,导致外部比表面积略有增加,但却提高了沸石颗粒的吸湿率和 pH 值。在水化胶凝体系中,煅烧沸石降低了工作性和水化热,并延缓了初凝时间。煅烧沸石颗粒吸收了新鲜混合物中的部分水分,体积膨胀,导致终凝时间前的化学收缩为负值,并增加了干燥收缩。随着煅烧沸石用量的增加,由于水化程度降低,抗压强度大幅下降。总之,浸泡煅烧预处理降低了clinoptilolite沸石颗粒的反应活性,影响了煅烧沸石在混合体系中的性能。
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Impact of Calcined Natural Clinoptilolite Zeolite on Hydration Kinetics and Shrinkage of Cementitious Materials
Previous literature has provided contradictory results, so we present the current investigation to provide additional information to assess the suitability of using soak calcination as a pretreatment method to increase the performance of calcined zeolite when used as the supplementary cementitious material. In this study, natural clinoptilolite zeolite was calcined for three hours at 200°C, 400°C, 600°C, 800°C, and 1,000°C, and the effects of calcination on different physical and chemical properties were observed using a range of experimental tests. The impacts of calcined zeolite were investigated in the hydrated system with the replacement of portland cement up to 20 % by mass on hydration kinetics (i.e., heat of hydration, setting time, chemical shrinkage, degree of hydration), drying shrinkage, and compressive strength. Results revealed that calcination minorly decreased the crystallinity, particle size, and peak pore size of the zeolite, leading to a slightly increased external specific surface area, whereas it increased the rate of moisture absorption and pH of zeolite particles. In the hydrated cementitious system, calcined zeolite reduced the workability and heat of hydration and retarded the initial setting time. The calcined zeolite particles absorbed a part of the water from the fresh mixture and expanded volumetrically, which led to a negative volume of chemical shrinkage up to the final setting time and increased the drying shrinkage. As the dosages of calcined zeolite increased, the compressive strength substantially decreased because of the lower degree of hydration. Overall, soak calcination pretreatment decreased the reactivity of clinoptilolite zeolite particles and impacted the performance of calcined zeolite in the blended system.
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来源期刊
Advances in Civil Engineering Materials
Advances in Civil Engineering Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
2.70
自引率
7.10%
发文量
40
期刊介绍: The journal is published continuously in one annual issue online. Papers are published online as they are approved and edited. Special Issues may also be published on specific topics of interest to our readers. Advances in Civil Engineering Materials provides high-quality, papers on a broad range of topics relating to the properties and performance of civil engineering materials. Materials Covered: (but not limited to) Concrete, Asphalt, Steel, Polymers and polymeric composites, Wood, Other materials used in civil engineering applications (for example, pavements, bridges, and buildings, including nonstructural building elements such as insulation and roofing), and environmental systems (including water treatment). Core Topics Covered: Characterization, such as chemical composition, nanostructure, and microstructure, Physical properties, such as strength, stiffness, and fracture behavior, Constructability, such as construction methods, quality control/assurance, life cycle analysis, and sustainability, Durability. Papers may present experimental or modeling studies based on laboratory or field observations. Papers relating to sustainability of engineering materials or to the impact of materials on sustainability of engineering structures are especially encouraged.
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