Shrinkage and Creep of Sustainable Self-Compacting Concrete with Recycled Concrete Aggregates, Fly Ash, Slag, and Silica Fume

Qin, Daqiang; Dong, Chunru; Zong, Zhenyu; Guo, Zhanggen; Xiong, Yuqiang; Tao, Jianguo

doi:10.1061/(asce)mt.1943-5533.0004393

Cited by 26 publications

(7 citation statements)

References 51 publications

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“…The reinforcement’s passivity is not compromised by using up to 10% GRC as a cement replacement and/or 50% MCRA as a NA substitute in accordance with the service life prediction model proposed in the Spanish code of EHE-08 [ 14 ]. Most of the researchers enhanced the inferior properties of MCRA through various treatments such as CO 2 curing [ 21 ], carbonation [ 22 ], acid treatment [ 23 ], heating [ 24 ], heating and scrubbing [ 25 ], the combination of mechanical, chemical, and thermal treatment [ 26 ], and the addition of various supplementary cementitious materials [ 27 , 28 , 29 , 30 ]. Treated mixed recycled aggregates have a lot of promise for use in structural applications, which are not subject to relentless environmental conditions [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

A Study on Mechanical and Microstructural Characteristics of Concrete Using Recycled Aggregate

et al. 2022

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The objective of this paper is to provide a comprehensive study about the performance of concrete using mixed coarse recycled aggregate (MCRA) as an alternative for natural aggregate (NA) at replacement levels of 0, 30, 60, and 100%, which can greatly reduce the environmental pollution by incorporating the construction and demolition wastes in the reproduction of concrete. The focus of this study was to use the raw MCRA that was directly obtained from a recycling plant and not further processed. Initially, MCRA was studied to ascertain if its property meets the recommended Indian standards for natural aggregates. Using the slump test, the workability of freshly prepared concrete with a characteristic strength of 30 MPa was assessed. Additionally, the mechanical performance of concrete was assessed on the specimens prepared in the different forms: cubes, cylinders, and beams. Moreover, Scanning Electron Microscopy (SEM) with EDAX, XRD, and FTIR were used to study the microstructural behavior of selected optimum and control mixes at 7 and 28 days of curing. The studies revealed that a higher MCRA content improved the workability of concrete and 30% replacement of MCRA improved the compressive strength by 11.01, 6.98, 6.19, and 14.24% at 7, 28, 56, and 90 days respectively. At the same time, the 30% replacement of the MCRA mix showed an improved split tensile and flexural strength by 2.92 and 6.26%, respectively. The microstructural analysis showed that the optimum mixture had a more condensed microstructure. Therefore, 30% replacement of MCRA can be incorporated in the characteristic strength of concrete of 30 MPa. In particular, MCRA incorporation had a positive influence similar to conventional concrete on the physical, mechanical, and microstructural properties, which can increase the utilization of all kinds of directly obtained construction and demolition wastes to increase the circular economy in the construction sector.

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Section: Introductionmentioning

confidence: 99%

A Study on Mechanical and Microstructural Characteristics of Concrete Using Recycled Aggregate

et al. 2022

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“…For fly ash-based concrete, 64 curves (1111 data points) and 18 control curves (159 data points) were extracted. The following changes were made to filter and clean the extracted data; Due to the small size of available data for slag concrete, the experimental results of Shariq et al [5] and Qin et al [6] were incorporated into the dataset. Shariq et al [5] experimentally investigated creep and shrinkage in GBFS concrete with cement substitution ranging from 0-60%.…”

Section: Concrete Creep Database and Input Variablesmentioning

confidence: 99%

“…Conversely, many researchers have found that SCMs may lead to reduced creep strains. Qin et al [6] analysed creep and shrinkage in self-compacting concrete (SCC) containing recycled aggregates and various blends of fly ash, slag and silica fume and observed that incorporating combinations of SCMs led to reductions in creep strains. Similar behaviour has been reported for the inclusion of ultra-fine GGBFS and silica fume in high-performance concrete (HPC) by Jianyong and Yan [7].…”

Section: Introductionmentioning

confidence: 99%

Utilisation of Machine Learning Techniques to Model Creep Behaviour of Low-Carbon Concretes

Bouras,

2023

Buildings

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Low-carbon concrete mixes that incorporate high volumes of fly ash and slag as cement replacements are becoming increasingly more common as part of efforts to decarbonise the construction industry. Though environmental benefits are offered, concretes containing supplementary cementitious materials exhibit different creep behaviour when compared to conventional concrete. Creep can significantly impact long-term structural behaviour and influence the overall serviceability and durability of concrete structures. This paper develops a creep compliance prediction model using supervised machine learning techniques for concretes containing fly ash and slag as cement substitutes. Gaussian process regression (GPR), artificial neural networks (ANN), random forest regression (RFR) and decision tree regression (DTR) models were all considered. The dataset for model training was developed by mining relevant data from the Infrastructure Technology Institute of Northwestern University’s comprehensive creep dataset in addition to extracting data from the literature. Holdout validation was adopted with the data partitioned into training (70%) and validation (30%) sets. Based on statistical indicators, all machine learning models can accurately model creep compliance with the RFR and GPR found to be the best-performing models. The sensitivity of the GPR model’s performance to training repetitions, input variable selection and validation methodology was assessed, with the results indicating small variability. The importance of the selected input variables was analysed using the Shapley additive explanation. It was found that time was the most significant parameter, with loading age, compressive strength, elastic modulus, volume-to-surface ratio and relative humidity also showing high importance. Fly ash and silica fume content featured the least influence on creep prediction. Furthermore, the predictions of the trained models were compared to experimental data, which showed that the GPR, RFR and ANN models can accurately reflect creep behaviour and that the DTR model does not give accurate predictions.

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“…For all these reasons, even replacing natural aggregates with recycled aggregates leads to conserving large amounts of natural resources 21,22 . This partial replacement provides significant environmental benefits, as it avoids landfilling and allows waste to be recycled, reduced, and reused 23,24 …”

Section: Introductionmentioning

confidence: 99%

“…21,22 This partial replacement provides significant environmental benefits, as it avoids landfilling and allows waste to be recycled, reduced, and reused. 23,24 The use of recycled concrete aggregates (RCA) obtained from construction and demolition wastes as aggregate in concrete has attracted great interest by researchers, and thus, efforts have been made to reduce, recycle and reuse wastes. 25,26 There are many different studies on concrete produced by using RCAs as aggregates.…”

Section: Introductionmentioning

confidence: 99%

Multi‐objective optimization and assessment of recycled concrete aggregates for sustainable development: Example of the Kömürhan bridge

Ulucan

Taş

Alyamaç

2023

Structural Concrete

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The main purpose of this study is to examine the advantages and disadvantages of the Kömürhan bridge, built with natural aggregate concrete in Elazig, in terms of mechanical, environmental, and economic properties if certain ratios of recycled concrete aggregate (RCA) were used. For this purpose, a detailed laboratory study was designed, and concrete samples were produced, all‐natural, all‐recycled, and both recycled and containing natural aggregates. Different water‐to‐cement, aggregate‐to‐cement, and recycled concrete aggregate‐to‐total aggregate ratios were considered for the mixture designs of these samples, and the fresh and hardened concrete properties of these samples were determined. Then, statistical analyses were made using the response surface method, and numerical models were developed to predict the fresh and hardened concrete properties with high accuracy. Mixtures containing RCA, which have the same fresh and hardened concrete properties as the fresh and hardened concrete properties of the Kömürhan bridge, which was selected as an example structure by using these models, were determined for optimization purposes. A detailed environmental and economic comparison of the optimization and reference mixtures was made. While making environmental assessments, energy consumption, global warming potential, waste generation, and abiotic depletion were considered. It was seen that the optimization mixtures were more economical and more environmentally friendly than the reference mixture. As a result of this study, it was predicted that the use of RCA in buildings constructed using large amounts of concrete could provide significant environmental and economic advantages and was exemplified by the Kömürhan bridge.

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Shrinkage and Creep of Sustainable Self-Compacting Concrete with Recycled Concrete Aggregates, Fly Ash, Slag, and Silica Fume

Cited by 26 publications

References 51 publications

A Study on Mechanical and Microstructural Characteristics of Concrete Using Recycled Aggregate

A Study on Mechanical and Microstructural Characteristics of Concrete Using Recycled Aggregate

Utilisation of Machine Learning Techniques to Model Creep Behaviour of Low-Carbon Concretes

Multi‐objective optimization and assessment of recycled concrete aggregates for sustainable development: Example of the Kömürhan bridge

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