Formulation of a novel nano TiO2-modified geopolymer grout for application in damaged beam-column joints

Kantarcı, Fatih; Maraş, Müslüm Murat

doi:10.1016/j.conbuildmat.2021.125929

Cited by 24 publications

(10 citation statements)

References 94 publications

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“…Moreover, the specimens under study showed a low water absorption and a good resistance to photodegradation. A significant improvement in the hardness and physical–chemical features of a similar materials was described by Kantarci and Maraş, which develop a nano TiO 2 -modified geopolymer mortar to be applied in damaged beam–column joints [ 104 ]…”

Section: Synthesis Of Functional Geopolymeric Hybrid Materialsmentioning

confidence: 99%

Geopolymers and Functionalization Strategies for the Development of Sustainable Materials in Construction Industry and Cultural Heritage Applications: A Review

et al. 2022

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In the last decades, new synthetic hybrid materials, with an inorganic and organic nature, have been developed to promote their application as protective coatings and/or structural consolidants for several substrates in the construction industry and cultural heritage field. In this context, the scientific community paid attention to geopolymers and their new hybrid functional derivatives to design and develop innovative and sustainable composites with better chemical resistance, durability and mechanical characteristics. This review offers an overview of the latest progress in geopolymer-based hybrid nanofunctional materials and their use to treat and restore cultural heritage, as well as their employment in the building and architectural engineering field. In addition, it discusses the influence of some parameters, such as the chemical and physical characteristics of the substrates, the dosage of the alkaline activator, and the curing treatment, which affect their synthesis and performance.

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Section: Synthesis Of Functional Geopolymeric Hybrid Materialsmentioning

confidence: 99%

Geopolymers and Functionalization Strategies for the Development of Sustainable Materials in Construction Industry and Cultural Heritage Applications: A Review

et al. 2022

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“…In recent years, geopolymer concrete has been introduced as an alternative to conventional Portland cement-based concrete with a much lower CO 2 footprint and better mechanical properties and durability. Geopolymer concrete and mortar are inorganic polymers based on alumina-silicates (AS s ), and calcium (C a O) activated with an alkaline activator solution of sodium hydroxide (NaOH) and sodium silicates (Na 2 SiO 3 ) (Adesina, 2020; Kantarcı and Maraş, 2022, Chowdary and Rao, 2022). The geopolymer concrete is environmentally friendly as it requires industrial by-products over its manufacturing (Maras and Kose, 2021).…”

Section: Introductionmentioning

confidence: 99%

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

Nikoo

Hafeez

Faridmehr

et al. 2023

Advances in Structural Engineering

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Geopolymer concrete has developed as a potential alternative to ordinary Portland cement-based concrete, wherein various industrial by-products have been converted as beneficial spin-offs. Apart from appropriate compressive strength in the construction sector worldwide, the durability, sound absorption, thermal conductivity, and weight of concrete are also major concerns. Lightweight geopolymer concretes have gained attention because of their superior strength, durability, lower environmental impact, and sustainable characteristics. In this view, the current study examined the feasibility of using sawdust as a natural fine and coarse aggregate substitution in fly ash (FA)-granulated blast furnace slag (GBFS) based geopolymer concrete. Four mixes with a different percentage of sawdust (25, 50, 75, and 100) substituting natural aggregate were designed to examine the effects of sawdust on fresh and hardened features of geopolymer concrete compared to those conventional FA-GBFS-based geopolymer concrete with natural aggregate. Sodium silicate (NS) and sodium hydroxide (NH) (with NS/NH ratio of 0.75) were utilized to dissolve the alumina silicate from FA and GBFS. Informational models were developed using an experimental dataset to estimate the compressive strength of geopolymer concrete mix designs. Besides, using the weight of the developed network, a global sensitivity (GS) analysis was developed to identify the sensitivity of compressive strength to the waste sawdust content. Test results confirmed that by substituting natural aggregate with 100% sawdust, there was around a 35% decrease in compressive strength. Nevertheless, the sound absorption coefficient was increased by an average of 38% in frequencies range between 1800 and 2500 HZ, and thermal conductivity decreased by around 4.5 times once the natural aggregate was substituted by 100% sawdust.

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“…Climate change is one of the major political, social, environmental and economic problems that have long‐term effects on all living organisms in the world 3,7 . Therefore, researchers have been making intense effort for development of inexpensive, eco‐friendly and novel binding composites to overcome these problems 9,10 …”

Section: Introductionmentioning

confidence: 99%

“…Geopolymers, also called alkali‐activated binders, are novel eco‐friendly binders proposed to reduce existing disadvantages of the PC production 1,7 . Geopolymer binders (GPBs) are inorganic polymers synthesized by alkaline activation of precursors such as blast furnace slag (BFS), fly ash and metakaolin rich in Si‐Al minerals with high alkaline liquids such as sodium hydroxide and sodium silicate 6,10 . Three‐dimensional polymeric gels including Si‐O‐Al‐O bonds occur as a result of these reactions, which are called geopolymerization 11 .…”

Section: Introductionmentioning

confidence: 99%

Effect of fibre characteristics on physical, mechanical and microstructural properties of geopolymer concrete: A comparative experimental investigation

Ekinci

2023

Strain

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The main aim of this work is to comparatively reveal the effect of fibre type, length and content on compressive strength and microstructure of structural geopolymer concrete (GPC) produced under constant mixture and curing parameters in order to address the significant gap in present literature. Firstly, GPCs with different NaOH concentrations (i.e., 6, 9, 12 and 15 M) and activator solution/binder (a/b) ratios (i.e., 0.45 and 0.55) were produced in ambient curing condition, and optimum production parameters were determined based on the preliminary evaluations. Then, glass and polypropylene fibres in 6‐mm length (GS6 and PP6) and polyamide and polypropylene fibres in 12‐mm length (PY12 and PP12) were included in GPCs at ratio of 0.4%, 0.8% and 1.2% (by volume). Compressive strength, apparent porosity, bulk density, ultrasonic pulse velocity (UPV), X‐ray diffraction (XRD) and scanning electron microscope (SEM) analysis of GPC samples were carried out comparatively. The inclusion of GS6 fibre enhanced the compressive strength thanks to fibre surface being covered by geopolymer gel and the strong adhesion between GS fibre and geopolymer matrix. SEM images of fibre reinforced GPC (FRGPC) also confirmed the experimental findings, which were attributed to improvement in compressive strength. Regardless of the fibre type, the maximum compressive value strength was obtained from GPC specimens with 0.4% fibre and then decreased. Higher fibre inclusions led to poor compaction, workability issues and inhomogeneous fibre dispersions. A very good relation (R2 = 0.98) was acquired between UPV and compressive strength values of GPC/FRGPC samples.

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Formulation of a novel nano TiO2-modified geopolymer grout for application in damaged beam-column joints

Cited by 24 publications

References 94 publications

Geopolymers and Functionalization Strategies for the Development of Sustainable Materials in Construction Industry and Cultural Heritage Applications: A Review

Geopolymers and Functionalization Strategies for the Development of Sustainable Materials in Construction Industry and Cultural Heritage Applications: A Review

Investigating the fresh and mechanical properties of wood sawdust-modified lightweight geopolymer concrete

Effect of fibre characteristics on physical, mechanical and microstructural properties of geopolymer concrete: A comparative experimental investigation

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