THE STRENGTH AND WATER ABSORPTION OF HEATED EXPANDED POLYSTYRENE BEADS LIGHTWEIGHT-CONCRETE

2021 ◽  
Vol 21 (83) ◽  
Author(s):  
Andi Prasetiyo Wibowo
Keyword(s):  
Water Absorption ◽  
Lightweight Concrete ◽  
Expanded Polystyrene ◽  
Polystyrene Beads

Efficient Eco-friendly Composite Fluorine Anhydrite-Based Materials

2017 ◽  
Author(s):  
Grigory Yakovlev ◽  
Jadvyga Keriene ◽  
Anastasiia Gordina ◽  
Irina Polyanskikh ◽  
Milan Bekmansurov
Keyword(s):  
Water Absorption ◽  
Lightweight Concrete ◽  
Gas Permeability ◽  
Average Density ◽  
Expanded Polystyrene ◽  
Environmental Load ◽  
Great Demand ◽  
Technogenic Waste ◽  
And Performance ◽  
Reduced Water

The paper presents possible ways of utilizing technogenic waste – fluorine anhydrite – by its use in production of dry mortars and piece goods from lightweight concrete with expanded polystyrene, as a organic filler, for low-rise construc-tion. The developed dry mortars are based on fluorine anhydrite binder and complex modifier comprising curing activator (sulfate or alkaline) and finely dispersed additive. The fluorine anhydrite-based compositions have improved physical and performance characteristics, including the improved strength and average density and reduced water absorption compared to the control composition. The developed lightweight anhydrite polystyrene concrete has the density grade of 700 kg/m3 and good vapor and gas permeability. The concrete is stabile while using and fire safe, because each granule of expanded poly-styrene is coated with anhydrite matrix, and has the strength sufficient for structural and heat insulating slabs and blocks. All mentioned compositions are eco-friendly and are in great demand for low-rise construction. Therefore the manufacturing of these compositions will consume a large amount of technogenic waste and will reduce the environmental load on the region where the waste is located.

Lightweight Concrete Precast Panels for the Improvement of Thermal Insulation of Housing with Expanded Polystyrene Beads

2021 ◽  
Vol 1033 ◽  
pp. 163-171
Author(s):  
Alexandra Reto ◽  
Renzo Sanabria ◽  
José Rodriguez ◽  
Alexandra Hinostroza
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Insulation ◽  
Lightweight Concrete ◽  
Linear Trend ◽  
Precast Concrete ◽  
Expanded Polystyrene ◽  
Dry Density ◽  
Conventional Concrete ◽  
Polystyrene Beads

The precast concrete elements in the construction of buildings are increasingly used due to their better quality control, constructive speed, reduction of the number of workers and less waste of resources compared to conventional construction; for wall applications, to these advantages, the design to ensure thermal comfort requires the improvement of the low thermal insulation of conventional concrete panels. The use of materials with lower thermal conductivity such as Expanded PolyStyrene Beads (EPSB) in lightweight concrete for the construction of precast panels in housing, contributes to improve thermal insulation and the saving operational energy during its operation phase, because the aggregate has a small size, low density and thermal conductivity; applied in higher volumes in concrete, reduces indoor heat loss in cold climates and indoor heat gain in warm climates in housing. The purpose of this research is to study the behavior of lightweight concrete with EPSB for 16%, 26% and 36% addition and evaluate the air-dry density, compressive strength, thermal conductivity, relationship between air-dry density with compressive strength and thermal conductivity. The results indicate that the higher the percentage of EPSB the air-dry density, compressive strength and thermal conductivity decrease; the relationships between air-dry density with compressive strength and thermal conductivity follow a linear trend and are similar.

scholarly journals Absorption Characteristics of Lightweight Concrete Containing Densified Polystyrene

2017 ◽  
Vol 3 (8) ◽  
pp. 594-609 ◽  
Author(s):  
Bengin Herki
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Construction Industry ◽  
Lightweight Concrete ◽  
Expanded Polystyrene ◽  
Partial Replacement ◽  
The Novel ◽  
Total Water ◽  
Capillary Water ◽  
Significant Difference

The environmental impacts of the construction industry can be minimised through using waste and recycled materials to replace natural resources. Results are presented of an experimental study concerning capillary transport of water in concrete incorporating densified expanded polystyrene (EPS) as a novel aggregate. A new environmentally friendly technique of densifying was used to improve the resistance to segregation of EPS beads in concrete. Twelve concrete mixes with three different water/cement ratios of 0.6, 0.8 and 1.0 with varying novel aggregate content ratios of 0, 30, 60 and 100% as partial replacement for natural aggregate by equivalent volume were prepared and tested. Total absorption, absorption by capillary action, and compressive strength was determined for the various concrete mixes at different curing times. The results indicated that there is an increase in total water absorption (WA) and capillary water absorption (CWA) and a decrease in compressive strength with increasing amounts of the novel aggregate in concrete. However, there is no significant difference between the CWA of control and concretes containing lower replacement level.

Estudo Comparativo Entre o Concreto Leve de PET e o Concreto Leve de EPS

2018 ◽  
Vol 13 (13) ◽  
pp. 23
Author(s):  
Dieison De Souza Lima ◽  
Emily Do Amaral ◽  
Kauana Gabriela Rocha De Lima ◽  
Rafael Capellari Fumegali ◽  
Thiago Dias Do Espírito Santo
Keyword(s):  
Water Absorption ◽  
Solid Waste ◽  
Lightweight Concrete ◽  
Phase 1 ◽  
Expanded Polystyrene ◽  
Raw Material ◽  
Phase 2 ◽  
Adverse Conditions ◽  
The Third ◽  
Plastic Containers

A geração de grandes volumes de resíduos sólidos tem sido um dos maiores problemas ambientais encontrados na atualidade e certamente o mais preocupante. Com o descarte inadequado de certos materiais, muita matéria-prima deixa de ser reaproveitada, como as embalagens plásticas pós-consumo de Politereftalato de Etileno – PET, um produto capaz de sobreviver mais de cem anos em condições adversas no meio ambiente. Deste modo, com o intuito de reciclar as embalagens de PET e ao mesmo tempo empregá-las na construção civil, foram realizados ensaios de concreto utilizando o PET como matéria-prima na fabricação de concreto leve, comparando suas características com traços de concretos leves tradicionais confeccionados com Poliestireno Expandido – EPS, conhecido como isopor. Foram fabricados na Fase 1, corpos de prova dos traços de concreto com EPS para avaliar os parâmetros iniciais, os métodos de dosagem e a definição do traço referência. Com o traço referência definido foi fabricado um concreto leve apenas com PET buscando obter características similares ao do traço com EPS. Na Fase 2, foram fabricados a partir do traço referência quatro tipos de concreto leve, o primeiro com PET, o segundo de PET com aditivo Bianco, buscando melhor aderência entre a argamassa e o PET, o terceiro com EPS e o quarto de EPS com aditivo Bianco. As amostras foram caracterizadas pelos ensaios de compressão, densidade e absorção de água. Com os resultados pode-se perceber que os comportamentos dos traços de concreto leves se assemelham visualmente, diferenciando apenas em seus pesos e resistências à compressão. Palavras-chave: Concreto Leve. EPS. Isopor. PET. AbstractThe generation of large volumes of solid waste has been one of the biggest environmental problems found nowadays and certainly the most worrisome. With the inadequate disposal of certain materials, much of the raw material is no longer reused, such as the post-consumer plastic containers of Polyethylene Terephthalate (PET), a product capable of surviving more than 100 years in adverse conditions in the environment. Therefore, in order to recycle PET containers and at the same time to use them in construction, concrete tests were carried out using PET as a raw material in the manufacture of lightweight concrete, comparing its characteristics with traditional lightweight concrete formula made with Expanded Polystyrene - EPS, known as Styrofoam. Phase 1 concrete test specimens with EPS were produced to evaluate the initial parameters, the dosing methods and the reference concrete formula. With the reference concrete formula defined, a lightweight concrete was fabricated with PET only to obtain similar characteristics to the concrete formula with EPS. In Phase 2, four types of lightweight concrete were manufactured from the reference concrete formula, the first with PET, the second from PET with Bianco additive, seeking better adhesion between the mortar and the PET, the third with EPS and the fourth EPS with additive Bianco. The samples were characterized by compression, density and water absorption tests. With the results it can be seen that the behavior of the lightweight concrete formula resembles visually, differentiating only in their weights and resistance to compression. Keywords: Lightweight Concrete. EPS. Styrofoam. PET.

Lightweight Concrete Incorporating Waste Expanded Polystyrene

2013 ◽  
Vol 787 ◽  
pp. 131-137 ◽  
Author(s):  
B.A. Herki ◽  
Jamal M. Khatib
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Ultrasonic Pulse Velocity ◽  
Pulse Velocity ◽  
Expanded Polystyrene ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Waste Polystyrene

This paper covers the results of an experimental investigation on mechanical and durability properties of concrete containing waste polystyrene based lightweight aggregate called Stabilised Polystyrene (SPS) as a partial replacement of natural aggregates. The properties investigated in this paper were water absorption by capillary action and total absorption, compressive strength and ultrasonic pulse velocity (UPV). The composite aggregate was formed with 80% waste polystyrene which was shredded to different sizes, 10% of a natural additive to improve the resistance to segregation and 10% Portland cement. The natural fine aggregate were replaced with 0%, 30%, 60% and 100% (by volume) of SPS. There was an increasing in water absorption and a decreasing in compressive strength and UPV with the increase in SPS aggregate content in concrete.

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