Investigation and evaluation on early-age crack resistance of ultra-high performance seawater sea-sand concrete with non-metallic fiber

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-04-23 DOI:10.1016/j.cemconres.2025.107906

Kaidi Jiang , Xin Wang , Lining Ding , Qingguo Ben , Zhiyuan Chen , Jian Ding , Xia Liu , Zhishen Wu

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引用次数: 0

Abstract

Ultra-high performance seawater sea-sand concrete (UHP-SSC) exhibits outstanding mechanical properties, but the high cracking potential of UHP-SSC under restrained conditions should not be neglected. As steel fibers pose a corrosion risk when used in UHP-SSC, this study investigated and assessed the crack resistance of UHP-SSCs reinforced with non-metallic fibers. Cracking experiments were conducted employing a slab test, and the influencing mechanism was investigated based on macro-fiber pullout testing, pore structure determination, autogenous shrinkage (AS) monitoring, and uniaxial tensile testing. Results revealed that both the twisted texture of macro-fibers and micro-fiber incorporation into the matrix can enhance bonding. Adding fibers increased the macroporosity, except for the basalt fiber. The fiber's mechanical properties were positively related to the reduction in AS, and increase in tensile performance, crack resistance. Meanwhile, with a partial replacement of macro-fibers with micro-fibers, multi-scale hybrid non-metallic fibers exhibited better anti-cracking ability than UHP-SSC reinforced with straight steel fibers.

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超高性能海水海砂混凝土（UHP-SSC）具有出色的力学性能，但在约束条件下，UHP-SSC 的开裂可能性也不容忽视。由于在 UHP-SSC 中使用钢纤维会带来腐蚀风险，本研究对使用非金属纤维增强的 UHP-SSC 的抗裂性进行了调查和评估。采用板坯试验进行了开裂实验，并根据宏观纤维拉拔测试、孔隙结构测定、自生收缩（AS）监测和单轴拉伸测试研究了影响机制。结果表明，大纤维的扭曲纹理和微纤维加入基体都能增强粘合效果。除玄武岩纤维外，纤维的加入增加了大孔隙率。纤维的力学性能与 AS 的降低、拉伸性能和抗裂性能的提高呈正相关。同时，在用微纤维部分替代大纤维的情况下，多尺度混合非金属纤维比用直钢纤维增强的 UHP-SSC 具有更好的抗裂能力。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.