High-strength geopolymer concrete based on coal washing waste

Moradikhou, Amir Bahador; Safehian, Majid; Golafshani, Emadaldine Mohammadi

doi:10.1016/j.conbuildmat.2022.129675

Cited by 12 publications

(6 citation statements)

References 42 publications

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“…Porous concrete, known for its excellent permeability and drainage capacity [2][3][4][5], is typically composed of cement mortar and aggregates and widely applied in areas such as parking lots, permeable road surfaces, and riverbank slopes [6][7][8][9][10]. With its unique porous structure, porous concrete plays a crucial role in mitigating urban flood risks and alleviating the urban heat island effect [11,12]. However, the cement in porous concrete is not only the world's most important building material, but also a major source of carbon dioxide emissions.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Porous Concrete Based on Geopolymer of Red Mud and Yellow River Sediment

Lv,

Chen,

Dai

et al. 2024

Materials

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Red mud (RM) and Yellow River sediment (YRS) are challenging to handle as waste materials. In this study, RM with geopolymer and heavy metal adsorption characteristics was combined with YRS and ground granulated blast furnace slag (GGBS) to develop a porous geopolymer with high strength and high adsorption performance. A geopolymer cementitious material with high strength was prepared using high temperature water bath curing of 90 °C and different dosages of YRS, and a porous geopolymer concrete was further prepared. The compressive strength, fluidity and setting time of geopolymer cementitious materials were tested, and the compressive strength, porosity and permeability of porous geopolymer concrete were also tested. The environmental impact assessment of geopolymer cementitious materials was further conducted. The hydration products and microstructure of geopolymer gel materials were analyzed by XRD, SEM and FT-IR tests. The results show that the addition of YRS can effectively prolong the setting time of the geopolymer cementitious material, and the enhancement rate is as high as 150% compared with the geopolymer cementitious materials without the addition of YRS. An appropriate amount of YRS can improve the compressive strength of the geopolymer cementitious materials, and its early compressive strength can be further improved under the high temperature water bath curing of 90 °C, and the compressive strength at an age of 3 d can be up to 86.7 MPa. Meanwhile, the compressive strength of porous geopolymer concrete at an age of 28 d is up to 28.1 MPa. YRS can participate in geopolymer reactions, and high temperature water bath curing can promote the reaction degree. Curing method and YRS dosages have little effect on the porosity and permeability of the porous geopolymer concrete. The porous geopolymer has a good heavy metal adsorption effect, and the alkaline pH values can be gradually diluted to neutral.

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Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Porous Concrete Based on Geopolymer of Red Mud and Yellow River Sediment

Lv,

Chen,

Dai

et al. 2024

Materials

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“…In 2021, cement production reportedly reached 4.4 billion tons worldwide [1,2], and the annual concrete consumption is forecasted to pass 18 billion tons by 2050 [3]. The manufacture of Portland cement (PC) used in concrete has substantial effects on the environment in terms of high energy use, natural resource depletion, and carbon dioxide (CO 2 ) emissions [4][5][6]. The cement manufacturing industries contribute roughly 7% of global CO 2 emissions [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Impact of Alkaline Concentration on the Mechanical Properties of Geopolymer Concrete Made up of Fly Ash and Sugarcane Bagasse Ash

Rihan,

Alahmari,

Onchiri

et al. 2024

Sustainability

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Geopolymer concrete (GPC) is a novel and environmentally friendly type of concrete that eliminates the use of cement, resulting in a significant reduction in carbon emissions and a more sustainable construction material. Alkaline activators are used in GPC to achieve rapid strength development. The most popular alkaline activators are sodium/potassium silicate and sodium/potassium hydroxide, which are known contributors to carbon emissions, hence limiting the advantages of GPC; therefore, reducing the amount of these alkaline activators that contribute to carbon emissions is necessary for developing a more sustainable geopolymer concrete. In this study, the influence of the variation in sodium hydroxide molarities on the performance of fly ash/sugarcane bagasse ash-based-geopolymer concrete was investigated. The different molarities used were 10 M, 12 M, 14 M, and 16 M sodium hydroxide solutions. In addition, the effect of sugarcane bagasse ash content (0%, 5%, 10%, 15%, and 20%) on the fresh and hardened geopolymer concrete properties were examined. The slump test, compression test, split tensile test, and flexure test were conducted on the cast samples. The results of this study showed that raising the concentration of NaOH from 10 M to 16 M while maintaining a sodium silicate to sodium hydroxide ratio of 2.5 resulted in a 3.75–10.2% improvement in compressive strength after 28 days. It is worth noting that, even at a concentration of 10 M, the concrete still achieved high strength.

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“…Geopolymer-based materials have recently gained considerable attention as sustainable alternatives to traditional cementitious materials. 1,2 Geopolymer, also known as inorganic polymers, is a gel with an amorphous structure. It possesses a three-dimensional structure composed of SiO 4 and AlO 4 tetrahedra.…”

Section: Introductionmentioning

confidence: 99%

Electrothermal effect of carbon fiber and graphite reinforced metakaolin‐based geopolymer

Zhang,

Lin,

Chen

et al. 2024

Int J Applied Ceramic Tech

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This paper investigates the influence of carbon fiber and graphite on the cyclic electrothermal performance of geopolymers (inorganic polymers). It was observed that carbon fibers, graphite, and the carbon fiber/graphite composite could form a stable conductive network at low voltage (3 V). However, under high voltages (9 and 12 V), the current of the geopolymer exhibited a peak shape in the first cycle, with higher voltages resulting in larger peak values and decreased conductivity in subsequent cycles. While graphite improved electrical and thermal conductivity, it weakened the microstructure, leading to an increase in microcracks and voids, and a reduction in the strength of geopolymers. The cumulative energy during the electrothermal process was calculated. The failure mechanism of the conductive network in the geopolymer during cyclic electrical heating was explained, highlighting the disruptive effect of gel shrinkage due to water loss on conductive networks.

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High-strength geopolymer concrete based on coal washing waste

Cited by 12 publications

References 42 publications

Preparation and Properties of Porous Concrete Based on Geopolymer of Red Mud and Yellow River Sediment

Preparation and Properties of Porous Concrete Based on Geopolymer of Red Mud and Yellow River Sediment

Impact of Alkaline Concentration on the Mechanical Properties of Geopolymer Concrete Made up of Fly Ash and Sugarcane Bagasse Ash

Electrothermal effect of carbon fiber and graphite reinforced metakaolin‐based geopolymer

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