采用可碳化小球藻制备高强度干铸浆料

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

Cement & concrete composites Pub Date : 2025-01-10 DOI:10.1016/j.cemconcomp.2025.105935

Hanxiong Lyu, Shipeng Zhang, Chi Sun Poon

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引用次数: 0

摘要

当使用含氯塑料作为替代燃料时，会在水泥窑的预热器涂层中形成一种不溶于水的矿物，小球藻(CE, Ca10（SiO4)3(SO4)3Cl2）。本文研究了采用CE作为SCM来提高含氯燃料在水泥制造中的利用率的可行性。采用零和易性压实法制备的干铸体（CE20），用20 wt% CE替代后，由于水泥含量减少，经1d碳化养护后抗压强度下降。然而，碳化CE将二次石膏引入粘合剂体系，导致水固化后孔隙中形成更多的钙矾石，这与热力学模型预测一致。它的形成细化了孔隙结构，使得CE20的28d强度（93.4 MPa）比OPC参考值高出21.1%。这些发现强调了在干浇非结构混凝土中使用CE作为SCM的潜力，以及碳化矿物产生二次石膏和钙矾石以增强混凝土性能的优势。

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Developing high-strength dry-cast pastes by incorporating carbonatable chlorellestadite

A water-insoluble mineral, chlorellestadite (CE, Ca₁₀(SiO₄)₃(SO₄)₃Cl₂), would be formed in the preheater coatings of cement kilns when using chlorine-containing plastics as alternative fuels. This work investigated the viability of employing CE as an SCM to enhance the utilization of chlorine-containing fuels in cement-making. Substituting 20 wt% CE in dry-cast pastes (CE20), which were prepared by compaction method with zero workability, exhibited decreased compressive strength after 1d carbonation curing because of reduced cement content. However, carbonating CE introduced secondary gypsum into the binder system, leading to more ettringite formed in pores after water curing, aligning with thermodynamic modeling predictions. Its formation refined the pore structure, leading to 28d strength of CE20 (93.4 MPa) exceeding the OPC reference by 21.1 %. These findings underscored the potential of using CE as an SCM in dry-cast non-structural concrete and the advantages of carbonating minerals to generate secondary gypsum and ettringite for enhancing concrete properties.

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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.