Standard Specifications for Concrete Structures-2007 by Japan Society of Civil Engineers

健人, 魚本; 忠良, 石橋; 佳延, 信田; 勉, 佐藤; 広隆, 河野; 耕司, 武若; 公隆, 宇治

doi:10.3151/coj1975.46.7_3

Cited by 20 publications

(11 citation statements)

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“…04, B.S. Institution, 2004;NZS 3101.1:2006NZS 3101.1: , 2006Uomoto et al, 2007;Sato et al, 2008;AUSTRALIA, 2009;ACI Committee 318, 2011). Generally, the experimental results must show values close by to the codal predictions.…”

Section: Densitymentioning

confidence: 99%

Development of self-compacting concrete using Bailey aggregate grading technique in comparison with Indian standard code of practice

Tantri

Nayak

Shenoy

et al. 2021

JEDT

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Purpose This study aims to present the results of an experimental evaluation of low (M30), mid (M40) and high (M50) grade self-compacting concrete (SCC) with three nominal maximum aggregate sizes (NMAS), namely, 20 mm, 16 mm and 12.5 mm, with Bailey gradation (BG) in comparison with Indian standard gradation (ISG). Design/methodology/approach This study was conducted in a laboratory by testing the characteristics of fresh and hardened properties of self-compacting concrete. Findings Rheological and mechanical properties of SCC were evaluated in detail and according to the results, a concrete sample containing lower NMAS with BG demonstrated improvement in modulus of elasticity and compressive strength, while improving the rheological properties as well. Meanwhile, SCC demonstrated poor performance in split tensile and flexural strengths with lower NMAS gradations and a direct correlation was evident as the increase in NMAS caused an increase in the strength and vice-versa. Originality/value Upon comparison of BG with ISG, it was revealed that BG mixes succeeded to demonstrate superior performance. From the material optimization, rheological and mechanical performance study, it is recommended that BG with NMAS 16 mm can be used for conventional SCC.

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Section: Densitymentioning

confidence: 99%

Development of self-compacting concrete using Bailey aggregate grading technique in comparison with Indian standard code of practice

Tantri

Nayak

Shenoy

et al. 2021

JEDT

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“…The formula includes the mixdesign-sheet high-strength concrete by Aitchin [14] planned concrete quality fc'=70 MPa, and quality of steel used fy=360 MPa (primary data). Based on previous research [7,11,10,16] obtained the greater the value of steel stress (fs), the more w (crack width) increases. From the formula in the graph there is still a spread so that the average is obtained the average: w=0.0005fs.…”

Section: Relationship Between Crack Width (W) and Steel Stress (Fs)mentioning

confidence: 89%

“…The formula obtained for the relationship between steel stress (fs) and crack width w from experiment (w exp ) and w from analysis (w an ) is as follows formula. Based on this analysis, the code JSCE [16] is (6) into a formula (7).…”

Section: Discussion the Influence Of Split Tensile Strength To Crack ...mentioning

confidence: 99%

Identifying the influence of split tensile strength to crack width of high-strength reinforced concrete beam with polypropylene fiber from medical mask waste

Ningrum,

Soehardjono,

Suseno

et al. 2024

EEJET

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Cracks in concrete structures due to tensile weakness can be repaired by using fiber concrete, including medical mask waste as an additive in high-strength concrete mixes. This research the influence of polypropylene fiber from medical mask waste on the mechanical characteristics, flexural behavior, and crack width of high-strength reinforced concrete (RC) beams. The initial stage involved examining the properties of the concrete constituent materials. The testing process was based on a high-strength concrete mix design using the Aitchin method mix design sheet. Compressive strength and split tensile strength were tested at fiber content (0 %, 0.15 %, 0.20 %, and 0.25 %). The three-point flexural testing procedure was carried out at 28 days on 1200×100×150 (mm) RC beams. The use of LVDT, strain gauge, and other measuring devices supported the acquisition of the required data. The results showed that the split tensile strength reached the optimum value of 66.19 MPa at 0.24 % fiber content. Polypropylene fiber from medical mask waste in RC beams showed a positive impact on reducing crack width at increased split tensile strength. Waste mask fiber content of 0.15 %, 0.20 % and 0.25 % gave stable and better results compared to 0 % content (no fiber). With high steel stress (fs), and high strain, it offers the potential to improve the mechanical properties of high-strength concrete, thereby reducing the width of cracks that occur. This improves the tensile weakness of the concrete. The effect of split tensile strength on the crack width (w) of beams with the formula approach: wexp=3.74ftf-1.513, wan=0.187ftf-0.022 shows that the experimental results have a significant effect on decreasing the crack width that occurs in high-strength RC beams, thereby improving the quality of concrete

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“…Subsequently, a cyclic pull-out test was performed to assess the force required to debond the CFRP or cause the CFRP material to reach its tensile yielding point. Since the ACI does not provide specific guidelines for this type of procedure, the JSCE C1.101 guidelines were utilised for the design and construction of concrete structures reinforced with fibre materials [24].…”

Section: Experimental Double Pull-out Test On G40 Concrete and Uhpfrcmentioning

confidence: 99%

Development of Analytical Model for Bonding of CFRP Rod in Concrete Subjected to Cyclic Loads

Azarkerdar,

Hejazi

2024

Applied Sciences

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Recent material science advances have resulted in the use of High-Performance Concrete (HPC) and Ultra-High-Performance Concrete (UHPC) in superstructures, which were chosen for their superior strength. However, under cyclic loads, these materials frequently show fatigue. Carbon-Fibre-Reinforced Polymer (CFRP) rods are replacing steel rebars due to their corrosion resistance and excellent strength-to-weight ratio and are thus gaining popularity in both infrastructural and superstructural design. However, due to a lack of understanding of their bond mechanics, modelling the interaction between CFRP rods and these advanced concretes in finite element simulations remains complex, particularly under cyclic loading. The bond behaviour of CFRP rods and both standard Grade 40 concrete and Ultra High-Performance Fibre-Reinforced Concrete (UHPFRC) under cyclic stresses is investigated in this work. A finite element model of connected concrete cube samples was built and analysed under cyclic stress, combining these concretes with CFRP rods. Furthermore, these samples were subjected to dynamic actuation testing to develop a traction-based constitutive model for the CFRP–concrete interface. In finite element models, an interface element devised for this study effectively approximated the binding, matching experimental data. The new analytical interface element improved simulation precision by 19% in displacement and 49% in pull-out force, resulting in a significant improvement in predicting the performance of the CFRP–UHPFRC bond under cyclic loading. The improved performance of the CFRP–UHPFRC bond under cyclic loading is attributed to the optimised interface model that enhances the bond integrity between CFRP rods and concrete.

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Standard Specifications for Concrete Structures-2007 by Japan Society of Civil Engineers

Cited by 20 publications

References 0 publications

Development of self-compacting concrete using Bailey aggregate grading technique in comparison with Indian standard code of practice

Development of self-compacting concrete using Bailey aggregate grading technique in comparison with Indian standard code of practice

Identifying the influence of split tensile strength to crack width of high-strength reinforced concrete beam with polypropylene fiber from medical mask waste

Development of Analytical Model for Bonding of CFRP Rod in Concrete Subjected to Cyclic Loads

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