State of the art review on supplementary cementitious materials in India – II: Characteristics of SCMs, effect on concrete and environmental impact

Gupta, Sanchit; Chaudhary, Sandeep

doi:10.1016/j.jclepro.2022.131945

Cited by 55 publications

(16 citation statements)

References 174 publications

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“…Since cement was another hotspot for most of the evaluated impacts, the replacement of it with recycled materials can generate greater benefits. The recycled concrete as powders can reduce the amount of cement as a filler material [62] or even a pozzolanic material, in this case recycling from calcined-clay waste [63,64]. Figure 5 compares the potential environmental impacts generated by DRB normalized with respect to the ORB results.…”

Section: Overall Resultsmentioning

confidence: 99%

Environmental Performance of Deconstructable Concrete Beams Made with Recycled Aggregates

et al. 2022

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The construction sector is one of the most energy-intensive and raw-material-demanding human activities and, hence, contributes a significant share of greenhouse gas emissions. As a matter of principle, making the construction sector “greener” is one of the main challenges for policy makers, private companies and the scientific community. For this reason, one of the most promising actions is based on recycling Construction and Demolition Waste (CDW) and converting them into secondary raw materials for the construction sector itself. Moreover, the reduction of the environmental impact can be further amplified through the optimization of the production, assembly and deconstruction/reuse procedures and through the maximization of the service life. In this aim, the present work aims at analyzing the environmental performance of duly sized and designed prefabricated Decontructable and Reusable Beam (DRB) incorporating with Recycled Concrete Aggregates (RCA) assembled by means of an innovative system based on a memory®-steel prestressing technique. The environmental performance is evaluated through Life Cycle Assessment with a cradle-to-gate approach: the analysis of 16 midpoint impact categories was conducted using the methodology proposed by EN15804. In this context, three allocation scenarios for avoided impacts due to reuse (100-0, 50:50 and 0-100) were considered, and a sensitivity analysis was performed. It was verified that due to the higher amount of post-tensioning required for the innovative shape memory alloy steel bars, the DRBs present inferior environmental performance than the Ordinary Beams (ORB). However, when analyzing the reuse scenarios, it was observed that the DRB could have considerably lower impacts, depending on the type of allocation procedure adopted in LCA modeling. This study brings as the main contribution an evaluation and some design guidelines for the development of circular concrete structures based on the principles of Design for Deconstruction (DfD) and the prefabricated process.

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Section: Overall Resultsmentioning

confidence: 99%

Environmental Performance of Deconstructable Concrete Beams Made with Recycled Aggregates

et al. 2022

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“…The experimental results explicitly imply that not only waste plastics could be recycled seamlessly in CBMs, but they can also show enhanced durability in terms of pseudo-ductility and waterproofing performance. Strength reductions may be a common problem when reusing waste materials, while the implications and long-term uses of materials with enhanced integrative properties are diversified in the practical engineering field [1,130], especially when cost of raw natural materials is a cause of concern. The continuous improvements within more interconnected research fields (e.g.…”

Section: Mechanism and Further Discussionmentioning

confidence: 99%

“…5. Generally, the partial replacement of natural sand with PP was accompanied by reductions in both strengths [1,17,21,25,26]. More importantly, the addition of small portions of EVA brought positive changes to the strain patterns.…”

Section: Mechanical Propertiesmentioning

confidence: 96%

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Enhanced recyclability of waste plastics for waterproof cementitious composites with polymer-nanosilica hybrids

Al-Mansour

Yang

et al. 2022

Materials & Design

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“…On average, annually, 1-1.25 million tons of SF and 230-260 million tons of GGBS are produced worldwide [17,18]. The inadequate management and disposal of these industrial residues can give rise to numerous environmental problems, including the emission of uncontrolled pollutants into the atmosphere during production and transportation, as well as soil and water pollution, if appropriate storage and disposal methods are not employed [19]. Furthermore, the excessive accumulation of significant volumes of SF and GGBS waste can exert pressure on waste management systems, resulting in earlier saturation of landfills.…”

Section: Introductionmentioning

confidence: 99%

Predictive Modeling and Experimental Validation for Assessing the Mechanical Properties of Cementitious Composites Made with Silica Fume and Ground Granulated Blast Furnace Slag

Asif,

Memon,

Javed

et al. 2024

Buildings

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Using sustainable cement-based alternatives, such as secondary cementitious raw materials (SCMs), could be a viable option to decrease CO2 emissions resulting from cement production. Previously conducted studies to determine the optimal mix designs of concrete primarily focused on either experimental approaches or empirical modeling techniques. However, in these experimental approaches, few tests could be performed for optimization due to time restrictions and lack of resources, and empirical modeling methods cannot be relied on without external validation. The machine learning-based approaches are further characterized by certain shortcomings, including a smaller number of data points, a less robust connection among the controlling factors, and a lack of comparative analyses among machine learning models. Furthermore, the literature on predicting the performance of concrete utilizing binary SCMs (silica fume (SF) and ground granulated blast furnace slag (GGBS)) is not available. Therefore, to address these drawbacks, this research aimed to integrate ML-based models with experimental validations for accurate predictions of the compressive strength (CS) and tensile strength (TS) of concrete that includes SF and GGBS as SCMs. Three soft computing techniques, namely the ANN, ANFIS, and GEP methods, were used for prediction purposes. Eight major input parameters, including the W/B ratio, cement, GGBS, SF, coarse aggregates, fine aggregates, superplasticizer, and the age of the specimens, were considered for modeling. The validity of the established models was assessed by using external experimental validation criteria, statistical metrics, and performance measures. In addition, sensitivity and parametric analyses were performed. Based on statistical measures, the ANFIS models outperformed other models with higher correlation and lower statistical error values. However, the GEP models exhibited superior performance compared to ANFIS and ANN with respect to the closeness of the RMSE, MAE, RSE, and R2 values between the training, validation, and testing sets for both the CS and TS models. Experimental validation showed strong evidence for the applicability of the proposed models with an R2 of 0.88 and error percentages of less than 10%. Sensitivity and parametric investigations demonstrated that the input variables exhibited the patterns described in the experimental dataset and the available literature. Hence, the proposed models are accurate, have better prediction performance, and can be used for design purposes.

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State of the art review on supplementary cementitious materials in India – II: Characteristics of SCMs, effect on concrete and environmental impact

Cited by 55 publications

References 174 publications

Environmental Performance of Deconstructable Concrete Beams Made with Recycled Aggregates

Environmental Performance of Deconstructable Concrete Beams Made with Recycled Aggregates

Enhanced recyclability of waste plastics for waterproof cementitious composites with polymer-nanosilica hybrids

Predictive Modeling and Experimental Validation for Assessing the Mechanical Properties of Cementitious Composites Made with Silica Fume and Ground Granulated Blast Furnace Slag

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