Optimization of normal and high strength recycled aggregate concrete mixtures by using packing model

Amario, Mayara; Rangel, Caroline Santana; Pepe, Marco; Filho, Romildo Dias Toledo

doi:10.1016/j.cemconcomp.2017.08.016

Cited by 87 publications

(41 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Finally, both reference concrete and RAC mixtures investigated in this research are purposely designed with the aim for them to achieve a given target strength: this result is achieved by applying a mix-design technique developed by the authors for RAC, which takes into account the properties of RCAs [29,30]. Specifically, both normal-(35 MPa) and high-strength (60 MPa) reference and RAC mixtures are considered in the present study, with the aim of investigating whether concrete with significantly different initial (28 days) strengths result in different evolution of damage induced by freeze-thaw cycles.…”

Section: Significance Of the Researchmentioning

confidence: 99%

“…The concrete mixtures composition was performed by the use of the well-known compressive packing model (CPM) that was originally developed for conventional structural concrete, but has been recently extended for concrete mixtures with RCA by Amario et al, 2017 [29] and Rangel et al, 2017 [30]. It is worth highlighting once again that adopting this methodology is one of the specific features of the present study, as each mixture is designed specifically for given properties (e.g., workability at the fresh state and compressive strength at 28 days of curing), and taking into account the inherent properties of constituents.…”

Section: Concrete Mixtures Composition and Mixing Proceduresmentioning

confidence: 99%

“…In order to take into account of the high absorption of RCAs, the recycled particles were added in dry condition during mixing and the expected absorption rate of coarse RCAs was considered in the mix-design calculation. Specifically, the absorption value of 50% of the total absorption obtained experimentally (24 h) was used, as, according to previous studies [29,40], RCAs absorb about 50% of their total absorption value during mixing.…”

Section: Concrete Mixtures Composition and Mixing Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Durability of Structural Recycled Aggregate Concrete Subjected to Freeze-Thaw Cycles

et al. 2020

Self Cite

View full text Add to dashboard Cite

The increasing global demand for natural resources and the extensive production of construction and demolition waste (CDW) raise concerns for both the economic and environmental consequences that they can induce. Several efforts are being made with the aim to promote sustainable practices in the construction industry. In this context, one of the most relevant options refers to reusing CDW in new construction: specifically, the use of recycled concrete aggregate (RCA) is attracting a growing interest. Unfortunately, although the behavior of recycled aggregate concrete (RAC) has been widely investigated in the last few years, there are still knowledge gaps to fill on various aspects of the RAC performance, such as its durability in extreme conditions. The present study deals with the freeze-thaw performance of normal- (C35) and high-strength (C60) RAC produced with RCAs derived from different sources. Specifically, ten concrete mixtures were subjected to a different number of freeze-thaw cycles (namely, 0, 150 and 300), with the aim of analyzing the degradation of key physical and mechanical properties, such density, compressive strength, elastic modulus and tensile strength. Based on the obtained experimental results, a novel degradation law for freeze-thaw cycles is proposed: it unveils a relationship between open porosity of concrete, which is directly correlated to the peculiar properties of RCAs, and the corresponding damage level determined on RAC specimens.

show abstract

Section: Significance Of the Researchmentioning

confidence: 99%

Section: Concrete Mixtures Composition and Mixing Proceduresmentioning

confidence: 99%

Section: Concrete Mixtures Composition and Mixing Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Durability of Structural Recycled Aggregate Concrete Subjected to Freeze-Thaw Cycles

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…They have been used already to investigate the packing properties of concrete mixtures consisting of coarse aggregate, fine aggregate and cementitious materials. Scholars have attempted to link the calculating results with performance of the concrete and to optimize the mix proportions based on the properties of granular materials (Amario et al 2017;Borges et al 2014;Brouwers and Radix 2005;de Larrard 1989;Sedran 1994, 2002;Fennis et al 2013;Hüsken and Brouwers 2008;Van-Tuan et al 2011;Ng and Foster 2013;Peng 2009;Stovall et al 1986;Su et al 2001;Yu et al 2014Yu et al , 2015.…”

Section: Introductionmentioning

confidence: 99%

Optimization for Mix Proportion of Reactive Powder Concrete Containing Phosphorous Slag by Using Packing Model

Peng

Liu

et al. 2020

ACT

View full text Add to dashboard Cite

A mix-design method based on packing model was used to optimize the mix proportion of Reactive Powder Concrete (RPC) containing phosphorous slag in this paper. The design aimed to achieve a densely compacted matrix by applying the modified Andreasen particle packing model, i.e., the Dinger-Funk particle size distribution (PSD) equation. MAT-LAB and Excel Solver Tool were utilized to implement the calculation of the design with four steps. The outcome of the design was quite similar to another two results obtained respectively through the method for minimum water demand of paste and through the orthogonal design for mix proportion of RPC. According to these three mix proportions, RPC specimens with volume fraction of steel fiber of 1% were produced after they had been cured in 95°C steam for 72 hours. Their compressive and flexural strength are more than 180 MPa and 28 MPa, respectively. Microstructural investigation of specimens through mercury intrusion porosimetry and scanning electron microscopy confirms the very low porosity and quite compact microstructure of the RPC.

show abstract

“…Others have sought to use waste from thermal power plants (marble aggregates, marble dust, and fly ash), as fillers in concretes for replacing natural aggregates, consequently reducing the impact on mountains, and extending the exploitation period of quarries [4]. Numerous factors, such as the mechanical properties of concrete with recycled aggregates [5], their long-term properties [6], the optimization of formulation by means of packing models [7], the effect of such type of aggregates in the fracture properties of concrete [8], or even the correct methodology for introducing recycled aggregates in the concrete formulation, have been studied [9,10]. In such a sense, recent research has also demonstrated that is possible to use the fine fraction of construction and demolition wastes, derived from prefabricated structures, as a substitution of natural fine aggregates for self-levelling mortars [11].…”

Section: Introductionmentioning

confidence: 99%

Use of Steel and Polyolefin Fibres in the La Canda Tunnels: Applying MIVES for Assessing Sustainability Evaluation

et al. 2018

View full text Add to dashboard Cite

Construction involves the use of significant quantities of raw materials and entails high-energy consumption. For the sake of choosing the most appropriate solution that considers environmental and sustainable concepts, tools such as the integrated value model for sustainable assessment (Modelo Integrado de Valor para una Evaluación Sostenible, MIVES) used in Spain, plays a key role in obtaining the best solution. MIVES is a multi-criteria decision-making method based on the value function concept and the seminars delivered by experts. Such tools, in order to show how they may work, require application to case studies. In this paper, two concrete slabs manufactured with differing reinforcements during the construction of the La Canda Tunnels are compared by means of MIVES. The two concrete slabs were reinforced with a conventional steel-mesh and with polyolefin fibres. This research was focussed on the main aspects affecting the construction. That is to say, the environmental, economic, and social factors were assessed by the method, being of special impact the issues related with maintenance of the structure. The results showed that from the point of view of sustainability, the use of polyolefin fibres provided a significant advantage, mainly due to the lower maintenance required.

show abstract

Optimization of normal and high strength recycled aggregate concrete mixtures by using packing model

Cited by 87 publications

References 30 publications

Durability of Structural Recycled Aggregate Concrete Subjected to Freeze-Thaw Cycles

Durability of Structural Recycled Aggregate Concrete Subjected to Freeze-Thaw Cycles

Optimization for Mix Proportion of Reactive Powder Concrete Containing Phosphorous Slag by Using Packing Model

Use of Steel and Polyolefin Fibres in the La Canda Tunnels: Applying MIVES for Assessing Sustainability Evaluation

Contact Info

Product

Resources

About