Alkaline activation via in-situ caustification of one-part binders of composite precursors of waste glass and limestone

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

Cement & concrete composites Pub Date : 2024-09-14 DOI:10.1016/j.cemconcomp.2024.105754

Luis Edgar Menchaca-Ballinas , Piyush Chaunsali , J. Ivan Escalante-García

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引用次数: 0

Abstract

Mixtures of powders of waste glass (WG), limestone (LS), Na₂CO₃ and CaO were used to formulate novel one-part in situ alkali-activated cement (WG-AAC). The in-situ interaction Na₂CO₃-CaO-H₂O promoted the formation of CaCO₃ and NaOH, which promoted the WG and LS dissolution and influenced the micro- and molecular features of the resulting cementitious products. Pastes and mortars developed 1-year strengths of up to 29 MPa and were stable underwater. Characterization by XRD, SEM, EDS, and ²⁹Si-NMR indicated that a Na₂CO₃:CaO ratio close to 1:1 resulted in polymerized C-S-H, CaCO₃, silica gel, and Ca-modified silica gel, which were intimately intermixed and possibly crosslinked through Q³ bonds. Such phases interacted synergistically improving the underwater stability of the WG-AAC, indicating that in-situ caustification is a suitable and practical alkaline activation for SiO₂-rich precursors.

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通过原位苛化对废玻璃和石灰石复合前驱体的单组分粘合剂进行碱性活化

利用废玻璃（WG）、石灰石（LS）、Na2CO3 和 CaO 的粉末混合物配制新型单组分原位碱活性水泥（WG-AAC）。Na2CO3-CaO-H2O 的原位相互作用促进了 CaCO3 和 NaOH 的形成，而 CaCO3 和 NaOH 又促进了 WG 和 LS 的溶解，并影响了所得胶凝产物的微观和分子特征。浆料和砂浆的 1 年强度高达 29 兆帕，并且在水下稳定。XRD、SEM、EDS 和 29Si-NMR 表征表明，Na2CO3:CaO 的比例接近 1:1，会产生聚合的 C-S-H、CaCO3、硅胶和 Ca 改性硅胶，它们紧密混合，并可能通过 Q3 键交联。这些相的协同作用提高了 WG-AAC 的水下稳定性，表明原位苛化是一种适用于富含 SiO2 前体的实用碱性活化方法。

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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.