采用冷粘轻质核壳骨料改善可持续高强轻质混凝土的膨胀和力学性能

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-04-02 DOI:10.1016/j.conbuildmat.2025.141095

Qiao Liao , Shen-Yi Lu , Chun-Peng Zhang , Jian-Xin Lu , Bi-Xiong Li , Zhen-Hua Duan , Chao-Ming Pang , Chi Sun Poon

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引用次数: 0

摘要

本研究通过结合冷粘合轻质核壳骨料和膨胀剂，开发出具有低收缩特性的可持续高强轻混凝土（HS-LWC），用于钢管混凝土（CFSTs）和模块化集成建筑（MiC）应用。研究了不同膨胀剂含量（0 ~ 8%）的HS-LWC的自缩水率，并对其内部相对湿度进行了监测。研究了HS-LWC填充cfst的膨胀变形。研究了HS-LWC的力学性能和微观特征。并在MiC工厂进行了中试，验证了HS-LWC在大规模生产中的可靠性。利用EnergyPlus软件对HS-LWC高层MiC建筑的节能潜力进行了分析。结果表明：随着膨胀剂含量的增加，HS-LWC的力学强度先显著升高，后由于孔隙结构的演化而降低；掺入膨胀剂的HS-LWC具有高强度轻骨料、致密的砂浆孔隙结构和良好的轻骨料与基体之间的界面过渡区，具有比普通混凝土更高的机械强度。早期cfst的周向膨胀有利于防止钢管与HS-LWC之间的脱落。HS-LWC的早期微膨胀行为主要是膨胀剂与LWAs内部固化的协同作用所致。推荐添加4%的HS-LWC获得低收缩率、高抗压强度(>；70 MPa)和低密度（~ 1800 kg/m3）。此外，一个混凝土模型表明，所开发的HS-LWC可以成功地用于MiC应用中的结构构建。HS-LWC高层MiC建筑节能效果明显，制冷能耗节约2-51%，采暖能耗节约26-55%。

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Improving expansion and mechanical properties of sustainable high-strength lightweight concrete incorporating cold-bonded lightweight core-shell aggregates

This research developed sustainable high-strength lightweight concrete (HS-LWC) with low-shrinkage characteristics by combining cold-bonded lightweight core-shell aggregates and expansion agent for concrete-filled steel tubes (CFSTs) and modular integrated construction (MiC) applications. The autogenous shrinkage of HS-LWC with diverse expansion agent contents (0–8%) was investigated, and its internal relative humidity was monitored. The expansive deformation of CFSTs filled with HS-LWC was explored. The mechanical properties and micro characteristics of HS-LWC were investigated. Moreover, a pilot-scale experiment was implemented in MiC factory to verify the reliability of HS-LWC in large-scale production. The potential energy savings of high-rise HS-LWC MiC buildings were analyzed by EnergyPlus software. The results demonstrated that with the increment of expansion agent content, the mechanical strength of HS-LWC increased significantly and then decreased due to the evolution of pore structures. The HS-LWC incorporating expansion agent exhibited higher mechanical strength than normal concrete, resulting from high-strength lightweight aggregates (LWAs), dense pore structures in mortar and good interfacial transition zone between LWAs and matrix. The circumferential expansion for CFSTs at an early age was beneficial for preventing the debonding between steel tubes and HS-LWC. The early micro-expansion behaviors of HS-LWC were mainly due to the synergistic effects of expansion agent and internal curing from LWAs. A content of 4% was recommended to acquire low-shrinkage HS-LWC with high compressive strength (> 70 MPa) and low density (∼1800 kg/m³). Furthermore, a mock-up concrete module demonstrated that the developed HS-LWC could be successfully adopted in constructing structures in MiC applications. The energy conservation of high-rise HS-LWC MiC buildings was obvious, saving 2–51% in cooling energy consumption and 26–55% in heating energy consumption.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.