温度对含 GGBS 混合料早期水化和凝结行为的影响

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2024-01-12 DOI:10.3151/jact.22.14
Fragkoulis Kanavaris, Marios Soutsos, Jian-Fei Chen
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引用次数: 0

摘要

过去几年来,在混凝土中使用辅助胶凝材料以提高其可持续性和耐久性的趋势越来越明显。其中最受欢迎的辅助胶凝材料可能就是磨细高炉矿渣(GGBS)。虽然对在标准条件(20°C)下养护的含 GGBS 混合料的水化和凝结特性进行了充分研究,但对含 GGBS 混合料而言,温度对水化热和凝结的影响以及这些特性之间的相互关系尚未进行评估。本研究确定了在高温(20、30、40、50 和 60°C)条件下固化的含有不同含量 GGBS(0、20、35、50 和 70%)的混合料的水化热和凝结性能。固化温度升高会加速水化反应,并能显著缩短含 GGBS 混合料的固化时间。对早期龄期的水化热进行研究,可为水泥基混合料的初凝和终凝时间提供指示。用于描述水泥基系统温度敏感性的 "表观 "活化能是根据水化热和凝结时间测量值计算得出的。研究发现,在水化热和凝结行为方面,"表观 "活化能随 GGBS 含量的增加而增加。表观 "活化能的数值因所考虑的材料特性(如抗压强度、水化热或凝结时间)而有很大不同。
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Effect of Temperature on the Early-age Hydration and Setting Behaviour of Mixes Containing GGBS

Over the past years there has been an increasing trend to use supplementary cementitious materials in concrete to improve its sustainability credentials and durability properties. Perhaps amongst the most popular supplementary cementitious materials is ground granulated blast-furnace slag (GGBS). While the hydration and setting characteristics of mixes with GGBS cured under standard conditions (20°C) has been adequately investigated, the effect of temperature on heat of hydration and setting and the interrelation of these properties has not been evaluated for GGBS containing mixes. In this study, the heat of hydration and setting behaviour of mixes with various levels of GGBS (0, 20, 35, 50 and 70%) cured under elevated temperatures (20, 30, 40, 50 and 60°C) is determined. Elevated curing temperature accelerates the hydration reactions and can significantly reduce the setting time of GGBS-containing mixes. The investigation of heat of hydration at very early ages, can provide an indication of the initial and final setting times of cementitious mixes. The “apparent” activation energy used to characterise temperature sensitivity of cementitious systems, is calculated based on heat of hydration and setting time measurements. It was found that the “apparent” activation energy increases with GGBS content for both heat of hydration and setting behaviour. The value of “apparent” activation energy differs significantly depending on the material property that is considered, such as compressive strength, heat of hydration or setting time.

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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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