Experimental study of the mechanical properties and microstructure of geopolymer paste containing nano-silica from agricultural waste and crystalline admixtures

Alvee, Ar Razi; Malinda, Rizka; Akbar, Alfie Muna; Ashar, Resa Dwi; Rahmawati, Cut; Alomayri, Thamer; Raza, Ali; Shaikh, Faiz

doi:10.1016/j.cscm.2021.e00792

Cited by 40 publications

(25 citation statements)

References 57 publications

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“…Aiken [ 17 ] studied the effects of slag powder content and activator content on fly ash geopolymer cementitious materials' sulfate corrosion resistance and concluded that geopolymer adhesive exhibits better sulfate corrosion resistance than Portland cement adhesive. Alvee et al [ 23 ] proposed that when the addition of nano‐silica and CAs in the controlled geopolymer is 5%, nano‐silica promotes the production of the CSH gels and CaCO 3 , and synergizes with self‐healing Cas, resulting in a dense microstructure. Meanwhile, it respectively increased the yield stress by 64.20%, the compressive strength up to 33.63% and the fracture toughness up to 232.69% compared to controlled group.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the effect of geopolymer adhesive on the bond behavior between CFRP and concretes

Liu

Yan

2022

Polymer Composites

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The application of geopolymer adhesive to CFRP-strengthened the RC structure is a new green reinforcement method, and the bonding behavior of geopolymer adhesive was studied in this paper. The geopolymer mechanical properties orthogonal test was conducted and the optimal proportion was obtained, which summarized the influence of slag powder content, liquid-solid ratio, and water glass modulus. A total of 15 adhesively bonded CFRP-concrete double-lap joints were fabricated and tested under shear loading to investigate the effect of geopolymer adhesive on the bonding behaviors. Modified bondslip models of the geopolymer adhesive specimens were developed and compared with the test date. The results showed that the failure models of epoxy adhesive and geopolymer adhesive are different. The bond strength, interface stiffness, and maximum shear stress of the geopolymer adhesive specimen can reach 93.6% ~97.6%, 95.7% ~132.9%, and 91% ~94% of the bond strength of epoxy adhesive respectively. The predicted τ max and s 0 of the proposed model are in excellent agreement with the experimental data, and the maximum deviation is À9.58%. This study proposes that geopolymer could be applied as an effective adhesive in the strengthening of RC structures.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on the effect of geopolymer adhesive on the bond behavior between CFRP and concretes

Liu

Yan

2022

Polymer Composites

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“…A little amount of nanosilica is added to the cementitious matrix to lower its viscosity, offset the detrimental effects of trapped air and reduce the permeability of the cured concrete. From Figure 20 C, it is noted that nanosilica (as pozzolanic material [ 94 ]) reacts with calcium hydroxide, and the reaction starts the creation of the secondary C-SH gel. This secondary C-S-H gel fills all of the pores in the solid state, making the concrete compact and improving its load capacity attributes.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Concrete Made with Partially Substitutions of Copper Slag (CPS): State of the Art Review

et al. 2022

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Copper slag (CPS) is a large amount of waste material produced during the manufacture of copper. The disposal of this waste material becomes a problem for environmental concerns. Therefore, it is necessary to explore feasible alternate disposal options. They may also be utilized in concrete manufacturing to cut down on the usage of cement and natural aggregates. A lot of researchers focus on utilizing CPS in concrete, either as a cement replacement or as a filler material. This article aims to summarize the literature already carried out on CPS in conventional concrete to identify the influence of CPS on the fresh, hardened and durability performance of cement concrete. Results indicate that CPS improved the strength and durability performance of concrete but simultaneously decreased the slump value of concrete. Furthermore, an increase in the durability performance of concrete was also observed with CPS. However, the higher dose results declined in mechanical and durability aspects owing to a scarcity of flowability. Therefore, it is suggested to use the optimum dose of CPS. However, a different researcher recommends a different optimum dose ranging from 50 to 60% by weight of fine aggregate depending on the source of CPS. The review also recommends future researcher guidelines on CPS in concrete.

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“…The solution is to reuse or include solid waste byproducts including fly ash, silica fume, bottom ash, slag, and glass waste into the concrete manufacturing process [1][2][3][4]. These concrete advances diminish the negative impacts of the concrete industry in affordable and natural issues by providing low costs, high strength properties, and ecological amicability [5][6][7]. Currently, the usage of reused aggregate concrete, which is made from waste concrete brought in from building sites and demolition, is being promoted to help alleviate the global scarcity of regular aggregate.…”

Section: Introductionmentioning

confidence: 99%

Concrete with Partial Substitution of Waste Glass and Recycled Concrete Aggregate

et al. 2022

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The current practice of concrete is thought to be unsuitable because it consumes large amounts of cement, sand, and aggregate, which causes depletion of natural resources. In this study, a step towards sustainable concrete was made by utilizing recycled concrete aggregate (RCA) as a coarse aggregate. However, researchers show that RCA causes a decrease in the performance of concrete due to porous nature. In this study, waste glass (WG) was used as a filler material that filled the voids between RCA to offset its negative impact on concrete performance. The substitution ratio of WG was 10, 20, or 30% by weight of cement, and RCA was 20, 40, and 60% by weight of coarse aggregate. The slump cone test was used to assess the fresh property, while compressive, split tensile, and punching strength were used to assess the mechanical performance. Test results indicated that the workability of concrete decreased with substitution of WG and RCA while mechanical performance improved up to a certain limit and then decreased due to lack of workability. Furthermore, a statical tool response surface methodology was used to predict various strength properties and optimization of RCA and WG.

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Experimental study of the mechanical properties and microstructure of geopolymer paste containing nano-silica from agricultural waste and crystalline admixtures

Cited by 40 publications

References 57 publications

Experimental investigation on the effect of geopolymer adhesive on the bond behavior between CFRP and concretes

Experimental investigation on the effect of geopolymer adhesive on the bond behavior between CFRP and concretes

Concrete Made with Partially Substitutions of Copper Slag (CPS): State of the Art Review

Concrete with Partial Substitution of Waste Glass and Recycled Concrete Aggregate

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