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Subject: search.filters.subject.Self-compacting concrete

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    Rheological Optimization of Steel Fiber-reinforced Self-compacting Concrete (SFSCC) Incorporating Calcareous Tuff Powder (CTP)
    (Jordan University of Science and Technology, 2025) Gueciouer, Djamila; Naadia Tarek; Ghernouti Youcef; Mansour Malika Sabria
    The purpose of this study is to formulate a steel fiber-reinforced self-compacting concrete (SFSCC) with optimal rheological properties, using calcareous tuff powder (CTP) as an addition and partial substitution for cement. The design of experiments (DOE) method was used to analyze the effect of fiber dosage, paste volume, and gravel-to-sand ratio on the SFSCC. A concrete rheometer was used to quantify the intrinsic rheological parameters. The rheological results of the SFSCC containing calcareous tuff powder indicate that both paste volume and fiber dosage significantly affect flow capacity, while plastic viscosity is exclusively governed by paste volume. The measured rheological parameters indicated that the steel fiber-reinforced selfcompacting concrete incorporating calcareous tuff powder is a high yield stress selfcompacting concrete (HYSCC), with yield stress values ranging from 62 Pa to 335 Pa and plastic viscosity values between 12 and 31 Pa.s. Rheological optimization through the DOE method allowed the identification of optimal composition factors, ensuring a targeted self-compacting behavior. The self-compacting behavior of the SFSCC observed in the rheometer was confirmed and validated at full scale, with slump flow values up to 72 cm and flow time (T500) between 3.0 seconds and 4.3 seconds.
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    Rheological and mechanical optimization of a steel fiber reinforced self-compacting concrete using the design of experiments method
    (Taylor & Francis, 2019) Gueciouera, Djamila; Ghernouti, Youcef; Naadia, Tarek
    The purpose of this study is to formulate a steel fibre reinforced selfcompacting concrete (SFSCC) that has optimal rheological and mechanical properties, using marble powder as an addition and partial substitution to cement. The design of experiments method (DOE) was used to analyse the effect of fibre dosage (%f), paste volume (Vp) and the gravel/sand ratio (G/S) on the SFSCC. A concrete rheometer is used to quantify the intrinsic rheological parameters. The rheological results of the SFSCC show that the flow capacity decreases with increasing fibre dosage. By against the increase in the volume of the paste (Vp) and the (G/S) ratio decreases the yield stress to give better performance to flow. The plastic viscosity is governed exclusively by the volume of the paste. Mechanical results showed that the volume of the paste has a significant influence on the flexural strength as well as the compression strength. Moreover, significant improvement in flexural strength is recorded when the three parameters (%f, Vp and G/S) increase. Also, the ductility of SFSCC increases with increasing fibre dosage, while the compressive strength is little affected by the latter
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    Experimental study on steel fibre reinforced self-compacting concrete incorporating high volume of marble powder
    (Taylor & Francis, 2014) Haddadou, Naima; Chaid, Rabah; Ghernouti, Youcef
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    Effect of calcined silt on the rheological behavior of cement pastes of the self compacting concrete SCC
    (European Journals Inc, 2010) Safi, Brahim; Benmounah, Abdelbaki; Saidi, Mohammad Said; Aboutaleb, Djamila
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    Fresh and hardened properties of self-compacting concrete containing plastic bag waste fibers (WFSCC)
    (Elsevier Ltd, 2015) Ghernouti, Y.; Rabehi, B.; Bouziani, T.; Ghezraoui, H.; Makhloufi, A.
    This paper presents the fresh and hardened properties of self-compacting concrete (SCC) containing plastic bag waste fibers (PBWF). Fibers were prepared by recycling waste material such as, plastic bag. Fourteen mixtures of SCC with 0.40 of water/cement ratio were studied, twelve SCC mixtures with plastic bag waste fiber (WFSCC) by varying the length of fibers (2, 4 and 6 cm) with different levels of incorporation (1, 3, 5 and 7 kg/m3) and two other mixtures, one with 1 kg/m3 of polypropylene fibers (PFSCC) and another without fiber as reference (RSCC). Slump flow, L-box, and sieve stability were performed to assess the fresh properties of the prepared mixtures. Compressive strength, splitting tensile strength and flexural strength of the concrete were determined for the hardened properties Test results show that mixtures based on PBWF with a length of 2 cm, met the criteria of self-compactability (evaluated by slump flow diameter, L-box and sieve stability test) regardless of the fibers content. The obtained results are very interesting, suggesting a possible use of PBWF for structural reinforcement of SCC, the presence of this fibers in concrete delaying the location of microcracks. Although, the incorporation of PBWF has not a significant effect on the compressive and flexural strengths, it has a important effect on the split tensile strength value at 28 days. The improvement varies from 4% to 74%, it depends on the amount of fibers, and it is not affected by the length of PBWF
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    Fresh and hardened properties of self-compacting concrete containing plastic bag waste fibers (WFSCC)
    (Elsevier, 2015) Ghernouti, Youcef; Rabehi, Bahia; Bouziani, Tayeb; Ghezraoui, Hicham; Makhloufi, Abdelhadi
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    Effects of alkaline and alkaline-earth ions on the rheological behavior and zetametric study of two cement pastes (artificial cement portland-CEMI and cement resistant to the sulfates-CRS) with the polynaphthalene sulfonate (PNS)
    (2012) Kheribet, R.; Samar, M.; Benmounah, A.; Safi, Brahim; Said, M.
    The use of admixtures which tends to be generalized in the formulation of self-compacting concrete (SCC), requires taking into account the chemical co mposition of cement, particularly its content of SO 3 , which can inhibit or restrain the effect of these a dmixtures (superplasticizers). For more information of the compatibility problem of cement-superplasticize r, the rheological tests with a rheometer-AR2000 and measurements of zeta potential with a Zêtasiser -2000 were used in this study. In order to understand this phenomenon due to the presence of S O 3 in cement, we propose to evaluate the action of alkaline and alkaline-earth ions, incorporating different types of additions (K + , Na + , and Ca 2+ ) to the cement pastes. To achieve this, our work will conce rn the study of rheological properties and physical characteristics of the pastes obtained using two ty pes of cement (C1: Cement Resistant to the Sulfates (CRS) and C2: CEMI). This experiment will focus on two reports: Water/Cement ( W/C) = 0.30 for which the polynaphthalene sulfonate (PNS) is used as supe rplasticizer and W/C = 0.50 (without superplasticizer). The results show that the presen ce of sulfate leads to different rheological behavi ors which are function of sulfates and the cements used