Damage evolution of UHPC under coupled high stress, temperature, and osmotic pressure: New multi-field experiment and non-destructive techniques

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-12 DOI:10.1016/j.powtec.2025.120793

Zhiyong Liu , Yunsheng Zhang , Gan Liu , Yuncheng Wang , Wanhao Yu , Jinyang Jiang

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引用次数: 0

Abstract

Underground structures in deep regions of ocean underground engineering are exposed to high stress, temperature, and osmotic pressure, which accelerate their damage and degradation. This work investigates the performance of ultra-high-performance concrete (UHPC) under these coupled conditions using a specially designed load-temperature-osmotic pressure coupling instrument. The damage evolution of UHPC was evaluated using ultrasonic pulse velocity (UPV), bulk density, and scanning electron microscopy (SEM). The results show that increasing the stress ratio causes greater damage to the UHPC while the damage and cracks in the UHPC under high temperatures and osmotic pressure are instead repaired. In addition, the number, width, and length of microcracks in UHPC increase with the increasing water-binder ratio. Reducing the water-cement ratio to 0.16 and incorporating 2 % steel fibers can result in the best performance in terms of damage resistance. These findings provide valuable insights into the application of UHPC in challenging underground structures in deep regions of ocean underground engineering.

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海洋地下工程深层区域的地下结构暴露在高应力、高温度和高渗透压下，这加速了它们的损坏和退化。本研究使用专门设计的荷载-温度-渗透压耦合仪器，研究了超高性能混凝土（UHPC）在这些耦合条件下的性能。使用超声波脉冲速度（UPV）、体积密度和扫描电子显微镜（SEM）对超高性能混凝土的损伤演变进行了评估。结果表明，增加应力比会导致 UHPC 受到更大的破坏，而高温和渗透压条件下 UHPC 的损伤和裂缝反而会得到修复。此外，UHPC 中微裂缝的数量、宽度和长度随着水胶比的增加而增加。将水灰比降低到 0.16 并加入 2% 的钢纤维可获得最佳的抗损坏性能。这些发现为超高性能混凝土在海洋地下工程深层区域具有挑战性的地下结构中的应用提供了宝贵的见解。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.