Dynamic response of expanded polystyrene concrete during low speed impact

This research has investigated the properties of thermally insulating geopolymer composites that were prepared using waste expanded polystyrene as lightweight aggregate. The geopolymer matrix was synthetized using metakaolin and an alkaline activating solution. To improve its mechanical properties, this matrix was modified by the addition of an epoxy resin to form an organic-inorganic composite. Moreover, in order to reduce drying shrinkage marble powder was used as an inert filler. The materials obtained were characterized in terms of physico-mechanical properties, thermal performance and microstructure. The geopolymer expanded polystyrene composite have improved properties compared to Portland cement-based materials, with higher strengths and lower thermal conductivity. The research demonstrates the manufacture of sustainable lightweight thermally insulating geopolymer composites using waste expanded polystyrene.

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“…Previous research has investigated EPS in Portland cement composites [12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and thermal properties of lightweight geopolymer composites

Colangelo

Roviello

Ricciotti

et al. 2018

Cement and Concrete Composites

169

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“…Compression tests were preformed on conventional concrete and dosed concrete specimens with 7, 14 and 28 percent crushed EPSW and R-PS, respectively, in periods of 7, 14 and 28 days of curing. The data obtained show that the samples of concrete dosed with 7 % by volume of crushed EPSW and R-PS have a compressive strength similar to the conventionally used concrete samples, reaching a resistance close to 27 MPa, 21 % ± 4 % less than the data obtained for conventional concrete [18], [29], [32]. The addition of 14 and 28 % by volume of EPSW, however, decreases the mechanical properties of the concrete by 72,5 ± 8,5 and 82,6 ± 9 % respectively and 35,6 ± 6 and 55,9 ± 7 % for concrete samples dosed with R-PS.…”

Section: Discussionmentioning

confidence: 73%

“…This characteristic, due to the lack of adhesion between the R-PS and the cement, allows the achievement of a better behaviour of the concrete before impact efforts. This favours the manufacturing of a lighter concrete as a result to the addition of EPSW as a lightweight aggregate [28], [29].…”

Section: Discussionmentioning

confidence: 99%

Recovery and Incorporation of expanded polystyrene SolidWaste in Lightweight Concrete

Espinoza-Merchán

Torres-Parra

Rojas-Arias

et al. 2020

Ing.

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Context: The high consumption of parts made from expanded polystyrene (EPS) generates environmental problems when disposed. Due to its low density and the low possibility of being utilized in other applications after its disposal, it is necessary to generate an alternative for the recovery and application of this type of waste. This work aims to generate an alternative in the application of EPS waste, particularly as a coarse aggregate in the manufacturing of lightweight concrete. Method: This study used discarded EPS containers as raw material. The material was cleaned, crushed and subsequently reduced in volume by applying acetone, generating pieces of polystyrene (R-PS) to be applied as a coarse aggregate for the manufacturing of lightweight concrete in different proportions. In addition, the pieces were subjected to a chemical attack process in order to observe their behavior. Results: The results show the degree of volume reduction of the EPS pieces by using different acetone ratios, establishing the best degree of reduction (in volume) of this material. Likewise, chemical attack tests show the behavior of R-PS against different agents in R-PS samples. Meanwhile, the failure tests on different concrete samples determine the best R-PS ratio as coarse aggregate for the manufacturing of lightweight concrete. Conclusions: The data obtained in this study show that the application of acetone on EPSW samples reduces its volume by up to 55 %. Concrete failure tests show that an optimum P-RS addition value, to be used as an aggregate in the manufacturing of lightweight concrete, is 7 %. This improves its resistance to chemical agents and weight reduction without significantly reducing the mechanical properties of concrete.

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“…EPS concrete has been widely used in civil engineering structures for insulating layers or blocks [1], semi-structural or structural elements [2], sub-base of pavements, road barriers, floating marine structures, protective layer, and military structures for energy absorbing [3,4,5]. Structural EPS concrete, with design strengths between 21 and 35 MPa [6], has become a focused group of EPS concrete for the increasing strength demands of construction projects.…”

Section: Introductionmentioning

confidence: 99%

“…Researches on the dynamic properties of EPS concrete were mainly focused on dynamic compressive/tensile performance [10,11] and energy absorption properties under drastic instantaneous impact [4,5]. Actually, EPS concrete could be designed to endure cyclic loadings, such as traffic loads, and its dynamic properties would not be the same as those measured in other conditions [12].…”

Section: Introductionmentioning

confidence: 99%

Study on the Fatigue and Durability Behavior of Structural Expanded Polystyrene Concretes

You

Miao

et al. 2019

Materials

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The fatigue and durability characteristics of structural expanded polystyrene concrete (EPS) are especially important when it was applied for structural elements in long-term service. In order to study the fatigue and durability behavior of structural EPS concrete, the long-term cyclic loading experiments and wetting–drying (W-D) cyclic experiments were conducted, respectively. The structural EPS concrete was found to have a relatively large damping and a fairly low dynamic elastic modulus under long-term cyclic load, which illustrated that it had a better energy absorption effect and toughness than plain concrete of the same strength level. Even if fine cracks appeared during the cyclic loading process, the relevant dynamic performance remained stable, which indicated that the structural EPS concrete had superior fatigue stability. In W-D cyclic experiments, the structural EPS concrete exhibited superior sulfate resistance. During the erosion test process, there was a positive correlation between the mass change and the evolution of the compressive strength of the structural EPS concrete, which indicated that ΔmB could be substituted for Δf to evaluate the degree of the structural EPS concrete eroded by sulfate attack. The study focuses on the fatigue performance and sulfate resistance of structural EPS concrete and is of important engineering value for promoting practical long-term operations.

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Dynamic response of expanded polystyrene concrete during low speed impact

Cited by 18 publications

References 21 publications

Mechanical and thermal properties of lightweight geopolymer composites

Mechanical and thermal properties of lightweight geopolymer composites

Recovery and Incorporation of expanded polystyrene SolidWaste in Lightweight Concrete

Study on the Fatigue and Durability Behavior of Structural Expanded Polystyrene Concretes

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