Recycled concrete and brick powders as supplements to Portland cement for more sustainable concrete

Likes, Lauren; Markandeya, Ananya; Haider, Md Mostofa; Bollinger, David; McCloy, John S.; Nassiri, Somayeh

doi:10.1016/j.jclepro.2022.132651

Cited by 118 publications

(19 citation statements)

References 74 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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“…However, the ultimate result is a less durable, but ecologically beneficial, material: recycled concrete is 40% less durable than regular concrete on average (Shukla, & Gupta, 2020). To strengthen the recycled concrete, the scientists used a new method of producing it under high pressure and added other elements to the original mixture (Likes et al, 2022). Pressure can be used to fix the shape of concrete, and chemicals can be used to boost flexibility and strength.…”

Section: Recycled Concretementioning

confidence: 99%

“…At the same time, it has a higher absorption capacity as compared to new concrete and sustainable concrete products/structures. However, disposal is less desirable because it disregards the value of these wastes, as well as their potential as secondary raw materials (Likes et al, 2022). Concrete recycling is critical for the environment because it is one of the most commonly used materials on the planet (Makul, 2020).…”

Section: Recycled Concretementioning

confidence: 99%

“…High-strength concrete is slightly more difficult to work with due to the lower cement-to-water ratio, but it has incredibly high strength, making it suited for skyscraper and sidewalk construction. A careful selection of aggregates is required to preserve its strength throughout time (Likes et al, 2022). Lightweight concrete is substantially lighter than other concrete combinations and has a lower mass per unit volume.…”

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confidence: 99%

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Analyzing the Use of Recycled Materials in Sustainable Concrete in the GCC Countries

Alsalama

Damdelen²

2022

Sustainability

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The modern construction industry is based on the development of concrete structures and concrete is the most commonly used building material for the construction industry. Concrete manufacturing involves dev elopement of a mixture containing different natural resources like stone, clay, sand, water, and cement. These natural resources are extracted and transported to the construction site to create concrete (Ahmad et al., 2022). On the other side, concrete waste poses a significant environmental and economic challenge for the global construction industry. The present study is based on analyzing the use of recycled material for the development of sustainable concrete mix. Recycled materials involve the recycling of construction waste that provides the best alternative for natural resources and helps to prevent the environment. The present study is based on qualitative data analysis and surveys to highlight the usage of recycled materials to develop sustainable concrete. The survey results demonstrate that recycled materials are significantly important for the development of concrete mix and it is cost-effective and also protect the environment. The present research provides a deep insight into the usage of recycled materials for sustainable concrete manufacturing.

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“…The research on RP is mainly about recycled concrete powder (RCP) and recycled brick powder (RBP) [ 8 ]. Researchers have performed various experiments to study the physical and mechanical properties of RCP and RBP in cement to explore the potential of RP as a cementitious material for the preparation of concrete [ 9 , 10 , 11 , 12 , 13 ]. A summary is that, although there are relevant experimental studies, the prediction accuracy and generalization performance on the strength of RPC are still unsatisfactory [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Ensemble Machine-Learning-Based Prediction Models for the Compressive Strength of Recycled Powder Mortar

et al. 2023

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Recycled powder (RP) serves as a potential and prospective substitute for cementitious materials in concrete. The compressive strength of RP mortar is a pivotal factor affecting the mechanical properties of RP concrete. The application of machine learning (ML) approaches in the engineering problems, particularly for predicting the mechanical properties of construction materials, leads to high prediction accuracy and low experimental costs. In this study, 204 groups of RP mortar compression experimental data are collected from the literature to establish a dataset for ML, including 163 groups in the training set and 41 groups in the test set. Four ensemble ML models, namely eXtreme Gradient-Boosting (XGBoost), Random Forest (RF), Light Gradient-Boosting Machine (LightGBM) and Adaptive Boosting (AdaBoost), were selected to predict the compressive strength of RP mortar. The comparative results demonstrate that XGBoost has the highest prediction accuracy when the a10-index, MAE, RMSE and R2 of the training set are 0.926, 1.596, 2.155 and 0.950 and the a10-index, MAE, RMSE and R2 of the test set are 0.659, 3.182, 4.285 and 0.842, respectively. SHapley Additive exPlanation (SHAP) is adopted to interpret the prediction process of XGBoost and explain the influence of influencing factors on the compressive strength of RP mortar. According to the importance of influencing factors, the order is the mass replacement rate of RP, the size of RP, the kind of RP and the water binder ratio of RP. The compressive strength of RP mortar decreases with the increase in the RP mass replacement rate. The compressive strength of RBP mortar is slightly higher than that of RCP mortar. Machine learning technologies will benefit the construction industry by facilitating the rapid and cost-effective evaluation of RP material properties.

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Recycled concrete and brick powders as supplements to Portland cement for more sustainable concrete

Cited by 118 publications

References 74 publications

Environmental Performance of Deconstructable Concrete Beams Made with Recycled Aggregates

Environmental Performance of Deconstructable Concrete Beams Made with Recycled Aggregates

Analyzing the Use of Recycled Materials in Sustainable Concrete in the GCC Countries

Ensemble Machine-Learning-Based Prediction Models for the Compressive Strength of Recycled Powder Mortar

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