Effect of incorporation of rice husk ash and iron ore tailings on properties of concrete

Chen, Zhi; Chen, Sili; Zhou, Yuwan; Zhang, Chengyu; Meng, Tiantian; Jiang, Shuangshuang; Liu, Liwen; Hu, Guiquan

doi:10.1016/j.conbuildmat.2022.127584

Cited by 25 publications

(6 citation statements)

References 80 publications

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“…In this study, the MOR of the CEM was approximately 25% of its compressive strength, which is attributable to the hybrid nucleation effect, which led to the formation of a denser C-S-H within the paste. The MOR-to-compressive strength (m/c) ratio is an essential parameter in assessing the toughness and cracking resistance of concrete materials, as reported by recent research [36]. A higher m/c ratio indicates superior resistance to cracking, signifying the ability of a concrete mix to withstand tensile stresses and maintain structural integrity.…”

Section: Application Of Cem As a Repair Materialsmentioning

confidence: 99%

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Yeo,

Mo,

Mahmud

2023

Buildings

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This research focuses on achieving early strength of cement-based materials through the hybrid nucleation acceleration method. Through the study of various mortar mixtures, which incorporate components such as ordinary Portland cement (OPC), fine limestone powder (with a particle size of d50: 1 μm), coarse limestone powder (with a particle size of d50: 12 μm), calcium silicate hydrate (C-S-H) nucleation seeding agent, and calcium nitrate (CN), the effect of the hybrid nucleation acceleration method was investigated. When OPC was substituted with 20% fine limestone powder, a strength of 13.5 MPa was achieved at 6 h, whereas the use of coarse limestone powder only yielded 3.5 MPa within the same time frame. The mortar containing 2% C-S-H nucleation seeding agent reached an impressive 16 MPa at 6 h. Meanwhile, through the synergistic combination of fine limestone powder and C-S-H nucleation seeding agent, the 6 h early strength attained an impressive 19 MPa. The micrograph revealed that the hybrid nucleation acceleration method significantly promoted the formation of a dense network of C-S-H within the paste, thus enhancing the packing density. Measuring the heat release demonstrated that the samples accelerated with the C-S-H nucleation seeding agent and fine limestone reached the peak 160 min earlier than the OPC sample, indicating a faster hydration process. The hybrid nucleation accelerated concrete (HNAC) achieved strengths of 20 MPa and 27 MPa within 6 and 8 h, respectively, whereas the 28-day strength surpassed 70 MPa. The concrete equivalent mortar (CEM), derived from concrete, attained a compressive strength of 25 MPa within 8 h, making it suitable for repair applications. The modulus of rupture (MOR) was 7.31 MPa at 8 h and increased to 17.27 MPa at 28 days. Overall, the developed concrete and CEM with the novel hybrid nucleation acceleration method allowed for high early and long-term strength for fast-track construction to be attained.

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Section: Application Of Cem As a Repair Materialsmentioning

confidence: 99%

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Yeo,

Mo,

Mahmud

2023

Buildings

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“…Treatment is quite difficult, the comprehensive utilization rate is generally low, and the main treatment is mainly by piling up, which not only encroaches on a large amount of land resources, but also causes great harm to the natural ecological environment and the social and economic environment. As an alternative to conventional cement, the preparation of alkali-inspired cementitious materials (AAMs) [9][10][11] and supplementary cementitious materials (SCMs) [12][13][14][15][16][17][18] from bulk industrial solid wastes has become a focus of research. They have lower environmental pollution, energy consumption and production costs compared to OPC.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Properties and Hydration Mechanism of Gypsum-Based Composite Cementitious Materials

Liu,

Song,

et al. 2024

Buildings

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In order to achieve the resourceful, large-scale and high-value utilization of bulk industrial solid wastes such as flue gas desulfurization gypsum (FGDG), fly ash (FA) and ground blast furnace slag (GGBS), and to reduce the dosage of cementitious materials, orthogonal experimental methods were used to prepare composite cementitious materials based on the principle of synergistic coupling and reconstruction of multi-solid wastes. Through the method of extreme difference and ANOVA, the influence law of different factor levels on the performance of the cementitious materials was studied, and the maximum compressive strength of cementitious materials was reached when the ordinary Portland cement (OPC) dosage was 20%, the FGDG dosage was 56%, the FA dosage was 19.2% and the slag dosage was 4.8%, and the W/B was 0.55. The hydration products and microscopic morphology of the cementitious materials were analyzed by means of XRD, SEM and MIP techniques, so as to elucidate the complex synergistic hydration mechanism, and then to determine the more optimal group distribution ratio. The results show that the hydration reaction between FGDG and OPC can be synergistic with each other, and C-A-H further generates AFt under the action of SO42−, and at the same time, it plays the role of alkali-salt joint excitation for FA–GGBS, generates a large amount of cementitious materials, fills up the pores of the gypsum crystal structure, and forms a dense microstructure.

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“…Therefore, recycling IOTs for the preparation of cementitious materials is an environmentally friendly and economically feasible method [21]. For example, Karthikeyan B et al [22] used dumped IOTs as a partial replacement in different proportions when waste marble powder is used as a filler material, replacing a smaller constant portion of cement, and the results were compared with traditional concrete. The optimum mix was identified as a combination of 30% IOTs and hybrid fibers.…”

Section: Introductionmentioning

confidence: 99%

The Preparation and Dust Suppression Performance Evaluation of Iron Ore Tailing-Based Cementitious Composites

Nie,

Li,

et al. 2024

Molecules

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In order to comprehensively utilize iron ore tailings (IOTs), the possibility of using IOTs as raw materials for the preparation of cementitious composites (IOTCCs) was investigated, and IOTCC was further applied to mine interface pollution control. The mechanical properties, hydration products, wind erosion resistance, and freeze–thaw (F–T) cycle resistance of IOTCCs were evaluated rigorously. The activity index of iron tailings increased from 42% to 78% after grinding for 20 s. The IOTCC was prepared by blending 86% IOT, 10% ground granulated blast-furnace slag (GGBS), and 4% cement clinker. Meanwhile, the hydration products mainly comprised ettringite, calcium hydroxide, and C-S-H gel, and they were characterized via XRD, IR, and SEM. It was observed that ettringite and C-S-H gel were principally responsible for the strength development of IOTCC mortars with an increase in curing time. The results show that the kaolinite of the tailings was decomposed largely after mechanical activation, which promoted the cementitious property of IOT.

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Effect of incorporation of rice husk ash and iron ore tailings on properties of concrete

Cited by 25 publications

References 80 publications

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Hybrid Nucleation Acceleration Method with Calcium Carbonate and Calcium Silicate Hydrate for Fast-Track Construction

Experimental Study on the Properties and Hydration Mechanism of Gypsum-Based Composite Cementitious Materials

The Preparation and Dust Suppression Performance Evaluation of Iron Ore Tailing-Based Cementitious Composites

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