Effect of polypropylene fibers on thermogravimetric properties of self‐compacting concrete at elevated temperatures

Qadi, Arabi N.S. Al; Mustapha, Kamal Nasharuddin; Naganathan, Sivakumar; Al-Kadi, Qahir N.S.

doi:10.1002/fam.2123

Cited by 13 publications

(4 citation statements)

References 4 publications

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“…Therefore, the use of 0.6 % glass fibres reduced the flow to 100 %, whereas the use of 1.4 % polypropylene fibres reduced the flow to 110 %. These results are supported by other researchers [35]–[37], whereas the fibres have a negative influence on the flowability, which decreases as the percentage of fibres increases. Furthermore, for LWFC reinforced with hybrid fibres, the flow of M9 was 115 % after adding 0.2 % glass fibres and 0.6 % polypropylene fibres.…”

Section: Resultssupporting

confidence: 88%

Toughness behaviour of high‐performance lightweight foamed concrete reinforced with hybrid fibres

Dawood

Hamad²

2015

Structural Concrete

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Lightweight foamed concrete (LWFC) is.Foamed concrete is produced either by a prefoaming or a mixed foaming method. The prefoaming method involves the separate production of base mix cement slurry (cement paste or mortar) and a stably preformed (foaming agent with water) and then the thorough blending of this foam into a base mix. In mixed foaming, the surface-active agent is mixed with the base mix ingredients and foam is produced during the mixing process, resulting in a cellular structure in the concrete [3]- [5]. Structural lightweight concrete (SLWC) is similar to normal-weight concrete except that it has a lower density [6]. SLWC is defined as a concrete having a compressive strength of up to 17 MPa with a bulk density less than 1950 kg/m 3 ; structural lightweight concrete can be 25 % lighter than normal-weight concrete but have a compressive strength of up to 60 MPa [7]. The term high-performance concrete (HPC) is used for concrete mixes that possess the following three properties: highworkability, highstrength and high durability [8].Plain concrete is a brittle material, which results in poor fracture toughness, poor resistance to crack propagation and low impact strength. This inherent brittleness has limited its application in fields requiring high impact, vibration and fracture strengths. Fibres are used to modify the tensile and flexural strengths, toughness, impact resistance and fracture energy, and to arrest crack formation and propagation and thus improve strength and ductility [9]-[12]. Glass fibres improve the strength of the material by increasing the force required for deformation and enhance the toughness by increasing the energy required for crack propagation [13]. Ghorpade [14] investigated the effect of glass fibre on high-performance concrete with silica fume as an admixture. The maximum percentage increase in compressive strength was observed at 1 % fibre and 10 % silica fume content. The flexural strength increases with up to 1 % of fibre volume, thus, the strength decreases. Polypropylene fibres are the most popular of the synthetics. They are chemically inert, hydrophobic and lightweight. Polypropylene fibres reduce plastic shrinkage cracking and subsidence cracking over steel reinforcement [6]. Banthia and Gupta [15] investigated the influ-

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Section: Resultssupporting

confidence: 88%

Toughness behaviour of high‐performance lightweight foamed concrete reinforced with hybrid fibres

Dawood

Hamad²

2015

Structural Concrete

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“…The best compressive strength of SCCs at ages 7, 14, 28, and 90 days was obtained when FA was added at the replacement rate of 20%. The compressive strength of SCCs increased by 16 decrease in compressive strength were higher in SCRFC mixtures. Thus, this finding may be attributed to the negative effect of fibers on concrete rheology, which affected the degree of concrete compaction and consequently decreased the compressive strength of concrete [25].…”

Section: Properties Of Fresh Concretesmentioning

confidence: 90%

“…Numerous researchers have reported that adding fibers at volumetric ratios of 0.1% to 1.0% improves the strength and engineering properties of ordinary concrete [16][17][18][19]. The addition of fibers to concrete, however, has negligible effects on compressive strength and the modulus of elasticity.…”

Section: Introductionmentioning

confidence: 99%

Influence of Fly Ash on the Properties of Self-Compacting Fiber Reinforced Concrete

Zeyad¹,

Saba²

2017

J Steel Struct Constr

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Self-compacting concrete (SCC) has high flow ability and high resistance to segregation and bleeding. These characteristics facilitate the mixing, casting and finishing of SCC without using compacting or vibrating machines. Adding mineral admixtures, such as fly ash (FA), and superplasticizers improves SCC properties by preventing segregation and bleeding and by increasing rheological parameters. SCC requires high flow ability under the influence of self-weight to completely fill all mold parts for full compaction. This paper discusses the results of an experimental investigation on the properties of SCC and self-compacting fiber reinforced concrete (SCFRC) mixtures with the inclusion of polypropylene fibers (PFs) and containing FA at replacement rates of 0%, 20%, 40%, and 60 % cement mass. The compressive, flexural, and split tensile strengths of the prepared concrete samples were investigated at ages of 7, 14, 28, and 90 days. The workability of fresh concrete mixtures was also studied through segregation, bleeding, slump flow, slump flow T50, L-box V-funnel T5, and V-funnel tests. Results showed that the best properties of fresh SCCs were obtained when FA was added at replacement rates of 20% and 40% cement mass. In addition, the inclusion of PFs at a volumetric ratio of 0.22% decreased segregation and bleeding and improved the flexural and tensile strengths of SCFRCs.

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“…Aslani and Bastami, 17 evaluated constitutive relationships for normal‐and high‐strength concrete at elevated temperatures. Al Qadi et al 18 investigated the effects of polypropylene fiber on thermogravimetric properties of self‐compacting concrete at high temperatures where self‐compacting concrete was prepared by the inclusion of cement, water, fly ash, natural sand, gravel, superplasticizer, and polypropylene fiber with various volume fractions. Aslani and Samali 19 conducted a study for predicting the bond between concrete and reinforcing steel at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

An experimental study to evaluate the postfire mechanical properties of concrete specimens

Daryan

Bakhtiari

Ghasemi

2020

Structural Concrete

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In this research, the mechanical behavior of structural concrete made with materials in Iran has been experimentally investigated after experiencing high temperatures. For this purpose, six different mix designs were selected in accordance with Iranian Concrete Standard (ABA). Six different target temperatures (25, 100, 250, 500, 700, and 900°C) were also selected for the purpose of fire experience. Compressive and tensile strength tests were carried out on all of the samples and their behavior was evaluated after experiencing different target temperatures. The results show a strong drop in compressive and tensile strength at temperatures above 700°C. It can be noted that at 900°C all specimens lost their strength. Finally, thanks to the large number of experiments, different relationships are presented based on the results to determine the mechanical properties of different mix designs at different temperature levels.

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Effect of polypropylene fibers on thermogravimetric properties of self‐compacting concrete at elevated temperatures

Cited by 13 publications

References 4 publications

Toughness behaviour of high‐performance lightweight foamed concrete reinforced with hybrid fibres

Toughness behaviour of high‐performance lightweight foamed concrete reinforced with hybrid fibres

Influence of Fly Ash on the Properties of Self-Compacting Fiber Reinforced Concrete

An experimental study to evaluate the postfire mechanical properties of concrete specimens

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