Influence of crushing index on properties of recycled aggregates pervious concrete

Zhang, Zhiquan; Zhang, Yufen; Yan, Changgen; Liu, Yunxiao

doi:10.1016/j.conbuildmat.2016.12.203

Cited by 121 publications

(39 citation statements)

References 13 publications

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“…Aggregate shape (angular vs. rounded) has a significant impact on the porosity of pervious concrete and, hence, the CO 2 sequestration potential. More angular aggregates require more water in normal concrete to achieve the same workability as round aggregates and, for pervious concrete, the use of angular aggregates result in more porous mixtures [40,41]. While this study does not explicitly consider differences in aggregate type in the mixture designs or the analyses that ensue, it is expected that the use of more angular aggregates for the same target design porosity will result in only minor reductions in porosity and, therefore, impart trivial reductions on the CO 2 sequestration potential.…”

Section: Net Lifecycle (And Recoverable) Co2 Emissionsmentioning

confidence: 99%

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On the Theoretical CO2 Sequestration Potential of Pervious Concrete

2019

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Pervious concrete, which has recently found new applications in buildings, is both energy- and carbon-intensive to manufacture. However, similar to normal concrete, some of the initial CO2 emissions associated with pervious concrete can be sequestered through a process known as carbonation. In this work, the theoretical formulation and application of a mathematical model for estimating the carbon dioxide (CO2) sequestration potential of pervious concrete is presented. Using principles of cement and carbonation chemistry, the model related mixture proportions of pervious concretes to their theoretical in situ CO2 sequestration potential. The model was subsequently employed in a screening life cycle assessment (LCA) to quantify the percentage of recoverable CO2 emissions—namely, the ratio of in situ sequesterable CO2 to initial cradle-to-gate CO2 emissions—for common pervious concrete mixtures. Results suggest that natural carbonation can recover up to 12% of initial CO2 emissions and that CO2 sequestration potential is maximized for pervious concrete mixtures with (i) lower water-to-cement ratios, (ii) higher compressive strengths, (iii) lower porosities, and (iv) lower hydraulic conductivities. However, LCA results elucidate that mixtures with maximum CO2 sequestration potential (i.e., mixtures with high cement contents and CO2 recoverability) emit more CO2 from a net-emissions perspective, despite their enhanced in situ CO2 sequestration potential.

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Section: Net Lifecycle (And Recoverable) Co2 Emissionsmentioning

confidence: 99%

“…As previously discussed, the fraction of initial emissions recoverable via carbonation has been previously studied for regular OPC concrete mixtures [19,20,25,40]. For both regular and pervious concrete mixtures, the amount of sequesterable CO 2 increases as compressive strength increases [40].…”

Section: Net Lifecycle (And Recoverable) Co 2 Emissionsmentioning

confidence: 99%

On the Theoretical CO2 Sequestration Potential of Pervious Concrete

2019

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“…An estimated 2 billion tons of construction and demolition (C&D) wastes are produced each year globally. These wastes create enormous negative effects on the environment in terms of land occupation and environmental pollutions of land, water, and air (1)(2)(3)(4). Recycling the C&D wastes for new applications is the most promising way to combat the negative impacts of C&D wastes as well as resources recycling.…”

Section: Introductionmentioning

confidence: 99%

“…In the case that HAP contains calcium and PO 4 2as its substantial constituents, and that calcium-rich minerals, i.e., calcium carbonate, lime, and calcium-magnesium fine particles are commonly used in construction putty as the filler (26), it was proposed to use WP as the calcium source to produce HAP by soaking WP into a phosphate solution such as diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 , DAP). Through this method, the non-structural waste (WP) can be converted into high-value environmental cleaning materials as heavy metal adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Preliminary study on the upcycle of non-structural construction and demolition waste for waste cleaning

Chen

Wang

et al. 2020

Mater. construcc.

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This study proposes a method to convert non-structural calcium-rich construction and demolition waste fines into adsorbents of heavy metal ions by mixing waste fines with diammonium hydrogen phosphate solution to produce hydroxyapatite, which has high surface areas and excellent ion-exchange capacity with heavy metal ions. As a result, environmental polluting waste is converted into environmentally cleaning material. Waste putty powders was chosen as the representative waste to investigate the detailed formation process of hydroxyapatite and the key reaction parameters of the reaction. Results showed that hydroxyapatite can be produced on waste putty particles. Higher ageing temperatures or longer ageing duration are beneficial to the yield and crystallinity of the produced hydroxyapatite. Adsorption testing confirmed that Ni 2+ can replace Ca 2+ in the hydroxyapatite lattice, leading to the formation of a new crystal, arupite (Ni 3 (PO 4 ) 2 •8H 2 O), and contributing to a modest adsorption capacity for Ni 2+ (15 mg/g) for the hydroxyapatite-containing waste putty. Citation/Citar como: Chen, P.; Chen, X.; Wang, Y.; Wang, P. (2020) Preliminary Study on the Upcycle of Non-structural Construction and Demolition Waste for Waste Cleaning. Mater. Construcc. 70 [338], e220 https://doi.org/10.3989/ mc.2020.13819 RESUMEN:Estudio preliminar sobre el empleo de residuos de construcción y demolición no estructurales para la eliminación de residuos. Este estudio propone un método para convertir residuos de construcción y demolición no estructurales, ricos en calcio y pulverulentos, en adsorbentes de iones de metales pesados mezclándolos con una solución de hidrógenofosfato de diamonio para generar hidroxiapatita, la cual presenta una elevada área superficial y una excelente capacidad de intercambio iónico de iones de metales pesados. De este modo, un residuo contaminante se convierte en un material que limpia el medio ambiente. Se seleccionó residuo en forma de masilla en polvo como residuo representativo para investigar en detalle los procesos de formación de hidroxiapatita y los parámetros clave implicados en la reacción. Los resultados mostraron que la hidroxiapatita se puede producir en las partículas de los residuos empleados. La producción y la cristalinidad de la hidroxiapatita se ve favorecida por temperaturas de envejecimiento elevadas y prolongadas. Los ensayos de adsorción confirmaron que el Ni 2+ puede sustituir al Ca 2+ en la estructura de la hidroxiapatita, formándose un nuevo mineral, arupita (Ni 3 (PO 4 ) 2 •8H 2 O), y contribuyendo a una adsorción modesta de Ni 2+ (15 mg/g) por parte de la masilla de residuos con hidroxiapatita.

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“…This kind of concrete, also, has several advantages such as temperature and sound insulation, useful for recharging groundwater resources, reducing thermal gradient, decreasing inflation due to freezing, etc. [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Using Waste Vermiculite and Dolomite as Eco-Friendly Additives for Improving the Performance of Porous Concrete

Azad

Mousavi

Karami

et al. 2018

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The present study investigated the applicability of waste vermiculite and dolomite as fine aggregate, known as appropriate mineral adsorbents to enhance the quality of urban runoff, for improving the mechanical properties of porous concrete. 180 samples were mixed by adding 5-30% vermiculite and dolomite, as fine aggregate, and combining them with ordinary sand; lime sand (combining of 5-15% of each). Results showed that although adding dolomite culminated in a minor reduction of permeability-average of about 30%-, the average of compressive strength was augmented by 120%. Results of compressive strength of dolomite samples were repeated in mixtures containing vermiculite (an increase of 57%). While exploiting vermiculite in high percentages (20, 25, and 30) resulted in an extensive decrease in the permeability (94%), it was improved to an acceptable level (about 40%) after using vermiculite in combination with ordinary sand (lime sand). All dolomite and improved vermiculite mixtures, after combining vermiculite with ordinary sand, had appropriate performance in draining storm-urban runoff; such that in the weakest case, stimulated storm runoffs with heights of 10, 20, 30 and 40 cm were completely drained only after 17, 36, 59 and 87 seconds, respectively. Also, using vermiculite resulted in reducing the concrete weight (about 100 kg). Generally, although a little reduction in the permeability was seen, but using waste vermiculite and dolomite improved the mechanical properties of porous concrete significantly.

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Influence of crushing index on properties of recycled aggregates pervious concrete

Cited by 121 publications

References 13 publications

On the Theoretical CO2 Sequestration Potential of Pervious Concrete

On the Theoretical CO2 Sequestration Potential of Pervious Concrete

Preliminary study on the upcycle of non-structural construction and demolition waste for waste cleaning

Using Waste Vermiculite and Dolomite as Eco-Friendly Additives for Improving the Performance of Porous Concrete

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