Exploration of fungal resistivity and mechanical performance of Zn-phases-doped geopolymers: ZnO and Zn/Al-LDH nanoparticles

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-29 DOI:10.1016/j.conbuildmat.2024.139369

M. Ramadan, D.G. Sayed, Faten A. Selim

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Abstract

Generation of green geopolymer pastes that are based on a 1:1 slag/fly ash ratio (Geo) is the main objective of this study owing to the limited production of cementitious slag in Egypt. Different doses of ZnO and Zn-Al-CO₃ layered double hydroxide (LDH) were individually incorporated in geopolymer pastes to attain our aim and are coded Geo, Geo-0.5 %ZnO, Geo-1 %ZnO, Geo-0.5 %LDH, and Geo-1 %LDH. Setting times of fresh pastes and compressive strength of hardened pastes up to 28-days of conventional alkali-activation have been measured. Setting times of fresh pastes and compressive strength of hardened pastes up to 28-days of conventional alkali-activation have been measured. The results confirmed that adding ZnO and LDH NPs to the neat geopolymeric paste (Geo) significantly accelerated the setting process within 7–23 mins, especially for samples Geo-1 %ZnO and Geo-1 %LDH with 7/17 and 8.4/17.5 min., respectively. On the other hand, mechanical results indicated that pastes containing zinc oxide had poor compressive strength, especially in the early stages while 0.5 % LDH nanoparticles had a positive role as the strength values reached 8.9, 40, 60 MPa at 1, 7, and 28 days of curing, respectively. This behaviour is attributed to creating different types of zinc/silicon-containing phases like zinc-alumino-silicate-hydrates (Z-A-S-H, Zn₆Al₁₂Si₁₂O₄₈.29H₂O), zinc-silicate-hydroxide-hydrate (Z-S-H, Zn₄Si₂O₇(OH)₂·H₂O) and calcium-zinc-silicate (CaZnSi₂O₆) which detected by XRD. Moreover, TGA and SEM techniques affirmed the catalytic performance of LDH nanoparticles inside the geopolymeric structure as extra quantities of CSH, CASH, and C₃AH₆ have been generated. Anti-fungal activity test for some selected geopolymeric pastes was conducted via agar diffusion test (ASTMD4300–1). Geo-0.5 % ZnO and Geo-0.5 %LDH samples possessed the highest recorded inhibition zones against Aspergillus Niger and Mucor Circinelloid -AUMMC 11656, especially against Penicillium Glabrum-OP69417 with 51±1, and 67±2, respectively.

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锌掺杂地聚合物的真菌电阻率和力学性能的探索：ZnO和Zn/Al-LDH纳米颗粒

由于埃及水泥渣产量有限，本研究的主要目标是生产基于1:1矿渣/粉煤灰比（Geo）的绿色地聚合物膏体。为了达到我们的目的，我们将不同剂量的ZnO和Zn-Al-CO3层状双氢氧化锌（LDH）分别加入到地聚合物糊状物中，并将其编码为Geo， Geo-0.5 %ZnO, Geo-1 %ZnO, Geo-0.5 %LDH和Geo-1 %LDH。测量了新鲜膏体的凝结时间和硬化膏体的抗压强度，最长可达28天的常规碱活化。测量了新鲜膏体的凝结时间和硬化膏体的抗压强度，最长可达28天的常规碱活化。结果表明，ZnO和LDH NPs在7-23 min内显著加快了其凝固过程，特别是Geo-1 %ZnO和Geo-1 %LDH样品的凝固速度分别为7/17和8.4/17.5 min。,分别。另一方面，力学结果表明，含氧化锌的膏体抗压强度较差，特别是在早期阶段，而0.5 % LDH纳米颗粒具有积极作用，在养护1、7和28 d时强度分别达到8.9、40、60 MPa。这种行为是由于生成了不同类型的含锌/硅相，如锌-硅铝-水合物（Z-A-S-H, Zn6Al12Si12O48.29H2O）、硅锌-水合物（Z-S-H, Zn4Si2O7(OH)2·H2O）和钙-硅酸锌（CaZnSi2O6）。此外，TGA和SEM技术证实了LDH纳米颗粒在地聚合物结构中的催化性能，因为产生了额外数量的CSH、CASH和C3AH6。采用琼脂扩散试验（ASTMD4300-1）对部分地聚合物膏体进行了抑菌活性试验。Geo-0.5 % ZnO和Geo-0.5 %LDH样品对黑曲霉和环毛霉-AUMMC 11656的抑制区最高，对Glabrum-OP69417的抑制区分别为51±1和67±2。

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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.