Mechanical and Environmental Performances of Concrete Using Recycled Materials

Timu, Alexandru; Bărbuţă, Marinela; Dumitrescu, Laura; Baran, Irina

doi:10.1016/j.promfg.2019.02.211

Cited by 13 publications

(7 citation statements)

References 4 publications

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“…The subsequent formation of clinker phases in a furnace at 1450 °C is very energy-intensive, generating another third of the CO 2 emissions [5,6]. Ongoing demolition and large amounts of concrete fines that have been landfilled as waste constitute a potential for reducing emissions by recycling cementitious parts [7][8][9]. The reactivation of Hydrated Cement Powder (HCP) is possible at much lower temperatures than those required for the production of ordinary Portland Cement (OPC), reducing the overall energy consumption [10].…”

Section: Introductionmentioning

confidence: 99%

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

et al. 2023

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Cement is the strength-forming component of concrete. It has been a major building material for more than a century. However, its production is accountable for a considerable percentage of global CO2 emissions and is very energy-intensive. The Ordinary Portland Cement (OPC) production is a thermal process at around 1450 °C. This study shows that the reactivation of Hydrated Cement Powder (HCP) can be successful at a much lower temperature. Therefore, the possibility of using HCP to replace parts of OPC in concrete reduces the energy consumption and the CO2 emissions associated with OPC production. HCP, which may ultimately stem from recycled concrete, needs treatment to produce new concrete of the required mechanical strength. Using reactivated HCP in concrete, an optimum strength is achieved by heating the HCP in the range of 400–800 °C. Among other factors, the type of cement used influences the optimum heating temperature and attainable strength. This paper shows that 600 °C is an optimum heating temperature using the OPC type CEM I 52.5R. The crystalline phase transitions resulting from the thermal treatment were analyzed by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetry (TG). The heat released during hydration was investigated, and scanning electron microscopy (SEM) displays the microstructure evolution. OPC can be partially replaced by thermally treated HCP in mortar, attaining similar mechanical strength values.

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Section: Introductionmentioning

confidence: 99%

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

et al. 2023

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“…This has led to an accompanying rise in research that looks to reuse such waste material. Waste material is exploited in a manner that both reduces cost and cleans the environment [2].…”

Section: Introductionmentioning

confidence: 99%

“…One way in which to incorporate C&D waste material in future construction projects is to use it as aggregates in mortar [2] and/or concrete. Aggregates constitute 60 to 80% of the volume of concrete, supplementing or completely replacing the natural material already in use with reused and recycled synthetic or waste material would reduce the demand for natural aggregates [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Assessing The Mechanical And Durability Performance Of Concrete Made Using Recycled Clay Masonry Rubble Bricks (CMRB) As Coarse Aggregates

2022

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The South African construction industry is currently faced with mounting construction waste and overflowing landfills. Consequently, the feasibility of using of clay masonry rubble brick (CMRB) as a partial replacement for natural coarse aggregate in concrete was investigated. Three concrete mixes were made using a water-to-binder (w/b) ratios of 0.60. A control mix as well as a mix containing 50% and 100 % replacement of coarse Andesite aggregate with CMRB as coarse aggregate was tested. The compressive strength, shrinkage and durability properties (with respect to oxygen permeability, water sorptivity and chloride conductivity) were assessed. The results show that the incorporation 100% MCR brick as coarse aggregate produced the lowest compressive strength result, the highest shrinkage rate and the least resistance to gaseous ingress and chloride conductivity. The concrete mix containing 50% MCR brick exhibited the least resistance to water absorption through capillary action. The mechanical and durability properties of both concrete mix containing MCR brick was largely affected by the porous nature of coarse masonry rubble. The results can be attributed to a relatively high void ratio leading to the presence of more interlinked pathways within the CMRB aggregate.

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“…Various studies focused on the preparation of modified mortars and concretes using fly ash [2], demolition waste [3], recycle aggregated [4,5], nanomaterial [6], rice hush [7], silica mineral [8], ceramic waste [9,10], fly ash combined with glass fiber [11], among others as partial replacement for cement, fine and coarse aggregates. Incorporating other materials in building materials affect their mechanical and physical properties [12]. Replacing fine aggregate with 10%, 20%, and 30% by volume recycled tire aggregates [13].…”

Section: Introductionmentioning

confidence: 99%

Properties of modified concrete with crumb rubber: Effect of the incorporation of hollow glass microspheres

Valencia-Villegas

Mesa

Arbeláez-Pérez

2020

redin

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In this study, the effect of incorporating hollow glass microspheres (HGM) on the mechanical properties of modified concrete with CR (crumb rubber) was evaluated. Different concrete samples replacing 15% of fine aggregates (total weight of CR + HGM = 15%) were prepared. It was found that the increase in the microsphere content was directly proportional to the slump, compressive strength, and the modulus of elasticity. The increase in the microsphere content was inversely proportional to density. Additionally, we found that in the modified concrete, the width, height and the number of cracks increased as the HGM content increases. The combined sample HGM12.5-CR2.5 (the one with the highest content of microspheres) resulted in concrete with the highest compressive strength of 19.1 MPa, which is 243% stronger than the concrete with only crumb rubber (9.2 MPa). From the XRD results, we were able to detect the presence of different phases formed by hydration during the process of preparing concrete mixtures. The micrographs allowed identifying the fracture in the microspheres during the preparation of the concrete mixtures when they came into contact with the aggregates. The addition of hollow glass microspheres to the mixtures prepared from crumb rubber improved their mechanical properties, and this makes it a potential system that can replace the traditional materials in the production of concrete.

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Mechanical and Environmental Performances of Concrete Using Recycled Materials

Cited by 13 publications

References 4 publications

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

Assessing The Mechanical And Durability Performance Of Concrete Made Using Recycled Clay Masonry Rubble Bricks (CMRB) As Coarse Aggregates

Properties of modified concrete with crumb rubber: Effect of the incorporation of hollow glass microspheres

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