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Publisher: TULPAR Academic Publishing (Total: 2 journals) [Sort by number of followers]

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	Challenge J. of Concrete Research Letters (Followers: 4)
	Challenge J. of Structural Mechanics (Followers: 7)

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Challenge Journal of Concrete Research Letters
Number of Followers: 4

This is an Open Access Journal

Open Access journal
ISSN (Online) 2548-0928
Published by TULPAR Academic Publishing

[2 journals]

Cover & Contents Vol.15 No.2
- Authors: Journal Management CJCRL
  PubDate: 2024-06-13
  Issue No: Vol. 15, No. 2 (2024)
The impact of openings on ferrocement I-beams: a study on metallic and
non-metallic mesh reinforcement
- Authors: Ghada Mousa Hekal, Ayman Magdy Moawad Elshaboury, Yousry B. I. Shaheen
  Pages: 30 - 46
  Abstract: The primary objective of this investigation is to assess the influence of openings on the structural performance of ferrocement I-beams, incorporating diverse metallic and non-metallic mesh reinforcements. Sixteen beams underwent testing utilizing a four-point loading system until failure, categorized into four groups based on the type of mesh reinforcement. Each group comprised a control I-beam without openings and three additional beams featuring one, two, and three openings, respectively. To ensure consistent reinforcement weight, the four groups were reinforced with three layers of welded steel meshes, two layers of expanded metal meshes, two layers of Tensar meshes, and eight layers of Gavazzi meshes. Comparative analysis of the experimental outcomes was conducted with finite element models utilizing Abaqus. Therefore, there was good agreement between the experimental and numerical results. The findings showed that beams with no openings, one, and two openings reinforced with Gavazzi meshes had the highest ultimate load compared to other tested beams, while beams with three openings, those reinforced with expanded metal meshes had the greatest ultimate loads. Placing three openings in beams, with dimensions of 100×50 mm (two of these openings are approximately 10 cm apart from each edge while the third opening is located at mid-span), reduced the load-to-weight ratio by about 20.7%, 12.9%, 8.2%, and 23.8% for welded beams, expanded beams, Tensar beams, and Gavazzi beams, respectively, compared to the beams with no openings.
  PubDate: 2024-06-13
  DOI: 10.20528/cjcrl.2024.02.001
  Issue No: Vol. 15, No. 2 (2024)
Effect of resin amount on the damping properties of polymer concrete
- Authors: Arif Ulu
  Pages: 47 - 55
  Abstract: In the construction and infrastructure sector, efforts are being made to find faster and more efficient materials. Polymer concrete (PC) challenges traditional concrete with its fast setting, durability and abrasion resistance. While studies on PC strength are abundant in the literature, studies on the effects of resin amount on damping capacity are fewer than mechanical performance. In this paper, the effect of resin proportion on damping capacity is investigated by modal tests. PC mixtures in the production with different resin proportions (11‒19%) were poured into molds of 10x25x500 mm, using aggregates of up to 3.15 mm in size. After 14 days, the natural frequency and damping ratios of the specimens up to 1000 Hz were determined in modal tests. While the damping ratio (DR) decreased in resin contents up to 17%, the results of the specimens with 19% resin ratio increased. However, when the products with the same resin ratio are analyzed, the random distribution of the aggregate affects the damping capacity. The main reason of negative correlation between resin amount and DR is the filler amount in the mixture. Because of the production consistency, fluidization of all the mixtures is prevented by adding fillers. Therefore, the impact of the resin amount on DR is limited or even negative. Besides that, to compare measurement results finite element method (FEM) analyzes are conducted. It can be said that the natural frequencies are not suited well especially in high frequency ranges due to frequency dependent properties (visco-elastic) of PC.
  PubDate: 2024-06-13
  DOI: 10.20528/cjcrl.2024.02.002
  Issue No: Vol. 15, No. 2 (2024)
Predicting compressive strength of AAC blocks through machine learning
advancements
- Authors: Ehsan Harirchian
  Pages: 56 - 68
  Abstract: Determining the strength properties of Autoclaved Aerated Concrete (AAC) through conventional compression experiments is both time-consuming and costly. Using sophisticated Machine Learning (ML) algorithms to forecast concrete compressive strength can expedite time-consuming experimental procedures and reduce expenses. In this study, four ML models were proposed, including Random Forest (RF), Support Vector Regression (SVR), Linear Regression (LR), and Stochastic Gradient Descent (SGD). These models were developed to forecast the compressive strength of AAC blocks based on a dataset of 525 cubic samples. By comparing the results using different evaluation indices, the study analyzed each input variable’s relative importance and impact on the output. The findings revealed that the SVR model had the least error and is thus the most suitable for concrete compressive strength estimation. This approach results in cost savings on both specimens and laboratory tests. Out of the seven input factors, which encompass the proportions of water, cement, sand, lime, fly ash, aluminum powder, and gypsum, the proportions of cement and water content were pinpointed as the most crucial characteristics. In contrast, aluminum powder and gypsum displayed less prominent significance.
  PubDate: 2024-06-13
  DOI: 10.20528/cjcrl.2024.02.003
  Issue No: Vol. 15, No. 2 (2024)
Cover & Contents Vol.15 No.1
- Authors: Journal Management CJCRL
  PubDate: 2024-03-09
  Issue No: Vol. 15, No. 1 (2024)
Reinforcement of concrete beams using waste carbon-nanoclay-fiberglass
laminate pieces
- Authors: Zinnur Çelik, Emrah Turan, Meral Oltulu, Gülşah Öner
  Pages: 1 - 6
  Abstract: In the last few decades, strengthening of structures in need of repair with fiber reinforced polymer (FRP) composite materials produced with different fiber types has gained great importance. Within the scope of this experimental study, the usability of hybrid glass and carbon composite laminates produced for different purposes and later cut into waste was investigated for concrete reinforcement. Hybrid composite laminates were produced in the form of glass-carbon-glass and carbon-glass-carbon, and the effect was investigated in two different sequences in the study. In addition, there are 3 different rates of nanoclay (0.50%, 0.75% and 1.25%) in the production of composite materials, and the effect of nanoclay ratio was investigated. In the study, two different numbers of composite laminates were adhered to the concrete samples produced in 70x70x280 mm dimensions and subjected to flexural strength test. In the Carbon-Glass-Carbon series using triple waste laminate pieces, the highest flexural strength was reported in the CGC-0.75-3 series, which achieved an increase of approximately 55% and 42% compared to the Control and Control-E series. It was determined that the effectiveness of the reinforcement technique of concrete with laminates in flexure did not change significantly depending on the number of laminate pieces. The main mode of failure in the experimental work was due to concrete fracture.
  PubDate: 2024-03-09
  DOI: 10.20528/cjcrl.2024.01.001
  Issue No: Vol. 15, No. 1 (2024)
Advantageous approach for boron ores used in cement production:
optimization of dehydration
- Authors: Mustafa Engin Kocadağistan, Harun Arslan
  Pages: 7 - 19
  Abstract: Boron with a certain water content is used for industrial purposes, including cement production. It is necessary to perform and optimize heat treatments and determine the water content. The heat treatment is applied to boron ores that must be used for cement production. However, these processes take time and increase costs. With this study, it will be possible to obtain boron products with the desired properties in a shorter time by determining the optimal parameters for dewatering processes. Colemanite and ulexite ores were reduced to a grain size of 44 microns by ore dressing processes and subjected to dewatering. The Taguchi method was used to optimize the dehydration of colemanite and ulexite ores. The orthogonal design of experiments method L18(6132) 3 factors, 18 trials was chosen to determine the design of experiments. The changes in the H2O-CaO-Na2O-B2O3 concentrations were determined on the basis of the analyses performed. TG/DTA analyses were carried out for comparison with the dehydration processes. In the optimization processes performed using the Taguchi method, the maximum water removal was achieved with 1 g of ore and a period of 6 hours. H2O removal was 98.42% at 650 °C for colemanite and 99.1% at 300 °C for ulexite. It has been shown that the dehydration of ulexite and colemanite ores can be optimized and the boron product with the desired properties can be obtained in a short time, which is an advantage for its use in the cement industry. It is expected that this study will serve as an important basis for future applications of B2O3 cement.
  PubDate: 2024-03-09
  DOI: 10.20528/cjcrl.2024.01.002
  Issue No: Vol. 15, No. 1 (2024)
The effect of the gravity on the earthquake performance of roller
compacted concrete dams
- Authors: Fethi Şermet, Murat Emre Kartal, Muhammet Ensar Yiğit, Emin Hökelekli
  Pages: 20 - 29
  Abstract: Roller compacted concrete (RCC) is a dry concrete mixture often utilized in the construction of large dams. The interlayer of the RCC dam, which is the weakest plane of the structure, can easily fail under hydraulic shear load, geological impact, earthquake force and environmental impact. In this study linear and performance analyzes were carried out for eight different scenarios for foundation effect, gravity effect and empty and full reservoir situations. In analyses, the earthquake response and performance of the Akçakoca RCC Dam, taking into account the interaction between the dam and the water. The reservoir water behavior is simulated using the Eulerian-Lagrangian coupled (CEL) approach with finite elements modeling. Linear analyses reveal that hydrodynamic pressure leads to increased displacements and principal stresses. The earthquake performance evaluation of the Akçakoca RCC dam indicates that critical concrete damages are expected based on linear time-history analyses conducted for both empty and full reservoir scenarios. Besides, according to this study, gravity effect clearly increases the earthquake performance of the dam.
  PubDate: 2024-03-09
  DOI: 10.20528/cjcrl.2024.01.003
  Issue No: Vol. 15, No. 1 (2024)

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