Chloride diffusion and binding capacity of sustainable cementitious materials with construction waste powder as cement replacement

Ma, Zhiming; Hu, Ruihan; Shen, Jiaxin; Wu, Huixia

doi:10.1016/j.conbuildmat.2023.130352

Cited by 17 publications

(4 citation statements)

References 49 publications

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“…The amount of waste materials and by-products is increasing and threatens environmental safety. Some of this waste can be used in the production of construction materials, such as concrete, or substitute cementitious materials [5][6][7][8][9][10][11][12]. Research is also being conducted using expired cement [13].…”

Section: Content Analysis and Discussionmentioning

confidence: 99%

Special Issue “Mineral Composite Materials Produced with Waste/Recycled Components”—Editorial Note and Critical Review of the Problems

Stempkowska

Gawenda

2023

Materials

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Section: Content Analysis and Discussionmentioning

confidence: 99%

Special Issue “Mineral Composite Materials Produced with Waste/Recycled Components”—Editorial Note and Critical Review of the Problems

Stempkowska

Gawenda

2023

Materials

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“…The maximum values are obtained at a substitution rate of 15%. However, the research results of some scholars [21][22][23][24] are different from the above, and it is believed that the incorporation of RCP to replace cement will reduce the mechanical properties of concrete. Xiao [25] shows that the addition of RCP significantly affects the mechanical properties of sulfate aluminate cement-based materials.…”

Section: Introductionmentioning

confidence: 88%

Gray Model Study of Strength and Pore Structure of Recycled Concrete Powder (RCP) Concrete Based on Low-Field NMR Technology

Hou,

Yu,

Zhang

et al. 2023

Materials

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In order to improve the resource utilization of recycled concrete powder (RCP), this study aimed to investigate the effect of RCP admixture, curing age, and alkali excitation on the strength of RCP concrete. In addition, the pore structure characteristics of RCP concrete were analyzed in combination with low-field NMR. Furthermore, a gray predictive GM (1, 4) model was established to predict the mechanical properties of the concrete based on the pore structure parameters, especially the compressive and flexural tensile strengths. The results of the study indicate that the mechanical properties, namely compressive strength and flexural strength, of RCP concrete exhibit an initial increase followed by a subsequent decrease with increasing RCP content at 3 d, 7 d, and 28 d curing ages. In particular, the concrete exhibits the highest mechanical properties when the RCP content reaches 10%. As the curing age increases, the RCP gradually achieves full hydration, resulting in further refinement of the concrete pores and a denser structure, which subsequently improves the mechanical properties. In addition, the strength growth rate of alkali-excited recycled concrete (ARC) showed a continuous increase, indicating that alkali excitation increasingly improved the mechanical properties of the concrete. Furthermore, the study accurately predicted the mechanical properties of RCP concrete by using GM (1, 4) prediction models for its compressive strength and flexural tensile strength using pore characteristic parameters.

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“…10,15 However, due to its low reactivity, when RHCP is directly used as the SCM, the strength and durability of concrete may decrease, which is not conducive to the resource utilization of RHCP. 16,17 Therefore, further efforts have been required to enhance the utilization of RHCP by solving the problem of low reactivity.…”

Section: Introductionmentioning

confidence: 99%

“…Among numerous cement SCMs, RHCP (refers to cement paste content in waste concrete), which is produced during the crushing and recycling process of construction and demolition wastes, has attracted attention due to its widespread availability and high recycling potential. , When RHCP is used as the SCM to partially replace cement clinker, low-carbon recycled concrete with different strength grades can be designed. This is an effective path to reduce the proportion of cement clinker usage, which has been proven in many studies. , However, due to its low reactivity, when RHCP is directly used as the SCM, the strength and durability of concrete may decrease, which is not conducive to the resource utilization of RHCP. , Therefore, further efforts have been required to enhance the utilization of RHCP by solving the problem of low reactivity.…”

Section: Introductionmentioning

confidence: 99%

A Promising Mineralization Method of Recycled Hardened Cement Powder and Its Material Evolution Mechanism in Portland Cement

Zhao,

Lyu,

Peng

et al. 2024

Ind. Eng. Chem. Res.

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Using recycled hardened cement powder (RHCP) as a substitute for cement clinker presents an opportunity for CO 2 reduction and solid waste utilization in the cement industry. This work proposes a promising mineralization method of RHCP to obtain carbonated RHCP (CRHCP), and the mineralization reaction kinetics and corresponding microscopic mechanism of the whole process are analyzed. Results show that by prewetting RHCP before mineralization, the homogeneous liquid film is formed on its surface, which can accelerate the diffusion and dissolution of CO 2 , making the mineralization reaction rate conform to the ideal diffusion control. Based on this method, the CO 2 uptake of CRHCP at the ambient temperature, CO 2 concentration of 20%, CO 2 partial pressure of 0.1 MPa, w/s of 0.25, and reaction time of 24 h reaches the optimal value of 29.75%, and CRHCP is a core−shell structure of silica gel-coated CaCO 3 . Moreover, compared with PC, the blended cement system with 20% CRHCP achieves a higher compressive strength, especially the 3 day early strength reaching 36.58 MPa (increased by 20.00%). This is attributed to the positive effect of CaCO 3 and amorphous silica gel in CRHCP, resulting in the continuous generation of hydration products and the gradual development of strength in the blended cement system with CRHCP.

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Chloride diffusion and binding capacity of sustainable cementitious materials with construction waste powder as cement replacement

Cited by 17 publications

References 49 publications

Special Issue “Mineral Composite Materials Produced with Waste/Recycled Components”—Editorial Note and Critical Review of the Problems

Special Issue “Mineral Composite Materials Produced with Waste/Recycled Components”—Editorial Note and Critical Review of the Problems

Gray Model Study of Strength and Pore Structure of Recycled Concrete Powder (RCP) Concrete Based on Low-Field NMR Technology

A Promising Mineralization Method of Recycled Hardened Cement Powder and Its Material Evolution Mechanism in Portland Cement

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