Performance of ultra-high-performance concrete incorporating municipal solid waste incineration fly ash

Lv, Yajun; Yang, Longbin; Wang, Julian; Zhan, Baojian; Xi, Zhuangmin; Qin, Yiming; Liao, Dang

doi:10.1016/j.cscm.2022.e01155

Cited by 10 publications

(5 citation statements)

References 25 publications

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“…This indicates a faster hydration rate of α'-C 2 S in ion-doped binder. It should be noted that the growth of Ca(OH) 2 can reflect the degree of hydration of the matrix to some extent, which is applicable to both cement and NHL systems, as demonstrated in many studies [50,51]. The FA-dosed specimen (F2B1.5) showed a more significant increase in Ca(OH) 2 characteristic peak intensity in 28 d compared with the un-doped specimen (B1.5), and this phenomenon supports the conclusion that FA has a facilitating effect on α'-C 2 S hydration.…”

Section: Phase Analysis Of Bindersmentioning

confidence: 88%

Study on the Hydration and Microstructure of B and B/Na Ion-Doped Natural Hydraulic Lime Composed with Silica Fume/Fly Ash

et al. 2022

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Natural hydraulic lime (NHL) has drawn much attention due to its environmentally friendly nature. The characteristics of both hydraulic and pneumatic components make it a potential substitute for Portland cement in surface decoration and ancient building restoration. In this study, both doping and mixing with supplementary cementitious materials were investigated. Two types of NHL3.5 were fabricated through calcination at 1200 °C with B and B/Na doping, respectively. It is noted that B ion doping is beneficial to the early compressive strength of the specimens, and B/Na doping is beneficial to the later compressive strength of the specimens. The observed outcome is that the compressive strengths of B and coupled B/Na doped NHL3.5 are higher than the blank sample due to the appearance of α’-C2S. Thereafter, the blank and doping NHL were incorporated with fly ash and silica fume. The incorporation of fly ash and silica fume could enhance the early and late hydration rate. Of the two, silica fume shows more pozzolanic effect in the early age. In the supplementary cementitious materials dosed group, pozzolanic dominates the hydration process.

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Section: Phase Analysis Of Bindersmentioning

confidence: 88%

Study on the Hydration and Microstructure of B and B/Na Ion-Doped Natural Hydraulic Lime Composed with Silica Fume/Fly Ash

et al. 2022

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“…However, the using of slag is not beneficial for the durability of UHPC. Lv et al [34] studies the effects of the municipal solid waste incineration (MSWI) fly ash treated with high temperatures on UHPC's mechanical properties and microstructure. They observed that the addition of MSWI fly ash decreases the overall porosity of the UHPC at the 28-day age, and the 28-day UHPC compressive strength increased regardless of the high-temperature treated MSWI fly ash replacement ratio.…”

Section: Introductionmentioning

confidence: 99%

Optimizing binders with maximum using of industrial waste to develop low carbon ultra-high performance concrete

Lu,

Huang,

Feng

et al. 2024

Eng. Res. Express

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Optimizing binders by using industrial waste and then adjusting microstructure has potential to develop low production cost and low carbon emission ultra-high performance concrete (UHPC) to meet different practical engineering requirements. This study first investigates the influence of silica fume, cenosphere and fly ash on paste mixing time, flowability, flexural and compressive strength of UHPC by using three-factor and four-level orthogonal test. Moreover, the effect of fly ash and slag content were further discussed, and the modification mechanisms of binders were revealed by analyzing pore structure, interface and characteristics of hydration products. The results show that silica fume and cenosphere are the most sensitive factors affecting paste mixing time and flowability of UHPC, respectively. The sensitivity of binders on compressive and flexural strength of UHPC can be ranked according to silica fume > fly ash > cenosphere and cenosphere > fly ash > silica fume, respectively. The binders’ composition for low-carbon UHPC with compressive strength grade of 120 MPa is that cement: cenosphere: silica fume: fly ash equals to 1:0.33:0.33:56, and the total amount of fly ash reaches 40%. Meanwhile, the 28d compressive/flexural strength decreases and the flowability increases with the increase of fly ash content, resulting from pore volume with size of 5-50 nm and Ca/Si ratio on the interface between steel fiber and matrix increase. The flowability of UHPC with slag is reduced and the cumulative pore volume with size of 50 nm-5 um pores is increased due to the influence of slag morphology, but the porosity and interfacial Ca/Si ratio is reduced because of the high pozzolanic activity of slag, leading to similar compressive and flexural strength with that of UHPC with fly ash.

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“…RPC is a type of ultra-high-performance concrete invented in the 1990s, which exhibits a compressive strength higher than 100 MPa and extremely high durability [14,15]. Boiler cinder is a solid waste produced without any pollution.…”

Section: Introductionmentioning

confidence: 99%

The Influence of CO2-Cured Boiler Cinder on the Mechanical Strength of RPC Exposed to NaCl Erosion

2023

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Boiler cinder is a kind of mining waste that may cause environmental pollution. Based on this reason, a processing method needs to be carried out. In this study, the influence of CO2-cured boiler cinder on the compressive and flexural strengths of reactive powder cement concrete (RPC) under NaCl actions is investigated. The mass loss rates (MLR) and the relative dynamic modulus of elasticity (RDME) are measured to reflect the resistance of NaCl erosion. The thermogravimetric analysis (TGA), scanning electron microscope (SEM), and X-ray diffraction (XRD) spectrum are obtained for revealing the mechanism of the macro performance. Results show that the relationship between the MLR and the mass ratio of CO2-cured boiler cinder fits the quadratic function with NaCl erosion. Meanwhile, the MLR during NaCl action are decreased by increasing the amount of CO2-cured boiler cinder. The MLR range from 0% to 5.3% during NaCl action, and the decreasing rate of MLR by CO2 curing on boiler cinder is 0%–51.3%. The function of RDME and the mass ratio of CO2-cured boiler cinder accords with the positive correlation quadratic function. The mechanical strengths decrease when NaCl erosion is encountered. The mechanical strengths’ decreasing rates of RPC are elevated with the increasing number of NaCl freeze–thaw cycles and the NaCl dry–wet alternations. The increasing rates of flexural and compressive strengths of RPC by 13.1%–36.3% and 11.2%–50.4% are achieved by adding CO2-cured boiler cinder. As observed from the TGA and SEM’s results, the addition of CO2-cured boiler cinder can increase the thermogravimetric value and the compactness of hydration products.

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Performance of ultra-high-performance concrete incorporating municipal solid waste incineration fly ash

Cited by 10 publications

References 25 publications

Study on the Hydration and Microstructure of B and B/Na Ion-Doped Natural Hydraulic Lime Composed with Silica Fume/Fly Ash

Study on the Hydration and Microstructure of B and B/Na Ion-Doped Natural Hydraulic Lime Composed with Silica Fume/Fly Ash

Optimizing binders with maximum using of industrial waste to develop low carbon ultra-high performance concrete

The Influence of CO2-Cured Boiler Cinder on the Mechanical Strength of RPC Exposed to NaCl Erosion

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