含超塑化剂的水泥浆回填土强度发展的多重物理测试

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2024-09-24 DOI:10.1016/j.cemconcomp.2024.105772

Zubaida Al-Moselly, Mamadou Fall

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引用次数: 0

摘要

目前用于固化和测试水泥浆回填土（CPB）机械强度的实验室程序没有考虑到 CPB 结构在现场所经历的复杂的多物理场（热，T；液压，H；机械，M；化学，C）过程。这种疏忽可能导致测量结果不可靠和设计不安全。在这项研究中，我们为含有超塑化剂的 CPB（CPB-PES）制定了多重物理固化和测试程序，以评估其在 THMC 固化条件下的强度发展情况，这种固化条件与现场条件接近。结果表明，CPB-PES 的强度发展在很大程度上受到 THMC 因素及其相互作用的影响。所研究的每个 THMC 因素对强度的贡献并不相同，在很大程度上取决于这些因素与固化时间之间的相互作用。与对照样品相比，含有 0.125 % PES 的 CPB 样品在 THMC 固化期间经过排水处理，在 28 天固化后强度提高了 809%。在 THMC 条件下固化的 CPB-PES 样品的强度可比在 THC 条件下固化的样品高出 57%。结果表明，热因素（T；现场固化温度升高）和化学因素（C；超塑化剂和水泥水化）之间、化学因素（C）和机械因素（M；现场固化应力）之间以及热因素和机械因素之间存在明显的相互作用。据观察，与化学和热因素的影响相比，机械因素对强度发展的影响并不明显，而且在固化温度升高时，机械因素的影响会减弱。这些发现强调了在确定 CPB-PES 强度发展时考虑现场相关 THMC 因素及其相互作用的极端重要性，这对于设计更安全、更经济的 CPB 结构，最终提高矿山生产率和安全性至关重要。

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Multiphysical testing of strength development of cemented paste backfill containing superplasticizer

Current laboratory procedures for curing and testing the mechanical strength of cemented paste backfill (CPB) do not take into account the complex Multiphysics (thermal, T; hydraulic, H; mechanical, M; chemical, C) processes that CPB structures are subjected to in the field. This oversight can lead to unreliable measurements and unsafe designs. In this study, a multiphysical curing and testing procedures for CPB with superplasticizer (CPB-PES) has been developed to evaluate its strength development under THMC curing conditions close to those encountered in the field. The obtained results demonstrated that the strength development of CPB-PES is greatly affected by the THMC factors and their interactions. The contributions of each one of the investigated THMC factors on the strength are not equally similar and greatly depend on the interaction between these factors and curing time. CPB samples with 0.125 % PES that underwent drainage during THMC curing showed a strength increase of up to 809 % after 28 days of curing, compared to the control samples. The strength of CPB-PES samples cured under THMC can be up to 57 % higher than that of samples cured under THC conditions. The results indicate a significant interaction between thermal (T; elevated field curing temperature) and chemical (C; superplasticizer and cement hydration) factors, between chemical (C) and mechanical (M; field curing stress) factors, as well as between thermal and mechanical factors. The influence of the mechanical factor on strength development was observed to be less pronounced compared to the impact of chemical and thermal factor, and is reduced at elevated curing temperatures. The findings underscore the critical importance of accounting for field-relevant THMC factors and their interactions in the determination of the CPB-PES strength development, which is essential for the design of safer and more economical CPB structures, ultimately enhancing mine productivity and safety.

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.