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  • Open Access

    ARTICLE

    Experimental Study on the Compressive Strength of Concrete with Different Wheat Straw Treatment Techniques

    Liang Wen1,2,*, Changhong Yan3, Yehui Shi4, Zhenxiang Wang4, Gang Liu4, Wei Shi4

    Journal of Renewable Materials, Vol.11, No.10, pp. 3681-3692, 2023, DOI:10.32604/jrm.2023.027671 - 10 August 2023

    Abstract The treatment of wheat straw is very difficult, and its utilization rate is very low; accumulation causes air pollution and even fire. To make full use of wheat straw resources, we examined how using different physical and chemical methods to treat the wheat straw which can improve its strength abilities, or enhance the activity of wheat straw ash. In terms of concrete additives, it can reduce the amount of cement used. In this paper, we found that alkali treatment can significantly improve the tensile strength of wheat straw fiber, but polyvinyl alcohol treatment has no… More > Graphic Abstract

    Experimental Study on the Compressive Strength of Concrete with Different Wheat Straw Treatment Techniques

  • Open Access

    ARTICLE

    Optimization of Mortar Compressive Strength Prepared with Waste Glass Aggregate and Coir Fiber Addition Using Response Surface Methodology

    Cut Rahmawati1,2,*, Lia Handayani3, Muhtadin4, Muhammad Faisal4, Muhammad Zardi1, S. M. Sapuan5, Agung Efriyo Hadi6, Jawad Ahmad7, Haytham F. Isleem8

    Journal of Renewable Materials, Vol.11, No.10, pp. 3751-3767, 2023, DOI:10.32604/jrm.2023.028987 - 10 August 2023

    Abstract Waste Glass (WGs) and Coir Fiber (CF) are not widely utilized, even though their silica and cellulose content can be used to create construction materials. This study aimed to optimize mortar compressive strength using Response Surface Methodology (RSM). The Central Composite Design (CCD) was applied to determine the optimization of WGs and CF addition to the mortar compressive strength. Compressive strength and microstructure testing with Scanning Electron Microscope (SEM), Fourier-transform Infrared Spectroscopy (FT-IR), and X-Ray Diffraction (XRD) were conducted to specify the mechanical ability and bonding between the matrix, CF, and WGs. The results showed… More > Graphic Abstract

    Optimization of Mortar Compressive Strength Prepared with Waste Glass Aggregate and Coir Fiber Addition Using Response Surface Methodology

  • Open Access

    ARTICLE

    Experimental Evaluation of Compressive Strength and Gas Permeability of Glass-Powder-Containing Mortar

    Yue Liang, Wenxuan Dai, Wei Chen*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.10, pp. 2639-2659, 2023, DOI:10.32604/fdmp.2023.027622 - 25 June 2023

    Abstract Glass powder of various particle sizes (2, 5, 10 and 15 μm) has been assessed as a possible cement substitute for mortars. Different replacement rates of cement (5%, 10%, 15%, and 20%) have been considered for all particle sizes. The accessible porosity, compressive strength, gas permeability and microstructure have been investigated accordingly. The results have shown that adding glass powder up to 20% has a significantly negative effect on the porosity and compressive strength of mortar. The compressive strength initially rises with a 5% replacement and then decreases. Similarly, the gas permeability of the mortar displays… More >

  • Open Access

    ARTICLE

    Assessment of the Mechanical Properties of Carbon-Fiber Heating Cables in Snow and Ice Melting Applications

    Zhiyong Yang1, Jiacheng Zhang1, Henglin Xiao1,2, Zhi Chen1,*, Tian Bao1, Yin Liu1

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.9, pp. 2267-2288, 2023, DOI:10.32604/fdmp.2023.028652 - 16 May 2023

    Abstract The use of carbon-fiber heating cables (CFHC) to achieve effective melting of snow and ice deposited on roads is a method used worldwide. In this study, tensile and compressive tests have been conducted to analyze the mechanical properties of the CFHC and assess whether the maximum tensile and compressive strengths can meet the pavement design specifications. In order to study the aging produced by multiple cycles of heating and cooling, in particular, the CFHC was repeatedly heated in a cold chamber with an ambient temperature ranging between −20°C and +40°C. Moreover, to evaluate how the More > Graphic Abstract

    Assessment of the Mechanical Properties of Carbon-Fiber Heating Cables in Snow and Ice Melting Applications

  • Open Access

    ARTICLE

    Effects of Cationic Surfactant on Fresh and Hardened Properties of Cement-Based Mortar

    Soumaya Zormati, Fadhel Aloulou*, Habib Sammouda

    Journal of Renewable Materials, Vol.11, No.5, pp. 2345-2365, 2023, DOI:10.32604/jrm.2023.026170 - 13 February 2023

    Abstract

    The objective of this study is to analyze the effects of using surfactant (CTAB) and cellulose nanofibers (NFC) as an admixture in cement mortars. We examined composite properties as porosity, compression energy, thermal conductivity and hydration. The results showed that with the addition of 0.7% by weight of NFC per emulsion in the presence of a cationic surfactant (CTAB). The new material produced presented a dry porosity between 4.7% and 4.4%, compressive strength between 9.8 and 22.9 MPa, and thermal conductivity between 0.95 and 2.25 W·m−1·K−1. Thus we show better mechanical and thermal performance than that

    More > Graphic Abstract

    Effects of Cationic Surfactant on Fresh and Hardened Properties of Cement-Based Mortar

  • Open Access

    ARTICLE

    Preparation and Study of Borosilicate Foam Glass with High Thermal Insulation and Mechanical Strength

    Yiwen Zhang1, Jianjun Xie1,*, Minghui Sun1, Shaolong Wang1, Tengfei Xu2,3, Yonggen Xu2,3, Xiaoqing Ding2,3, Ying Shi1, Lei Zhang1

    Journal of Renewable Materials, Vol.11, No.5, pp. 2125-2141, 2023, DOI:10.32604/jrm.2023.025127 - 13 February 2023

    Abstract Foam glass is a kind of green building material that is widely used because of its excellent thermal insulation and mechanical properties. In this study, the borosilicate foam glass was fabricated by powder sintering method using recycled soda lime waste glass, quartz, and borax as the primary raw materials. CaCO3 was used as a foaming agent and Na2CO3 as a flux agent. Results showed that as the quartz content decreases from 30 to 17.5 wt.% and borax content increases from 5 to 17.5 wt.%, the pore size, porosity, and thermal insulation of borosilicate foam glass increase significantly, while… More > Graphic Abstract

    Preparation and Study of Borosilicate Foam Glass with High Thermal Insulation and Mechanical Strength

  • Open Access

    ARTICLE

    Effect of Polypropylene Fiber on the Unconfined Compressive Strength of Loess with Different Water Content

    Wankui Ni1, Jiaxin Zhong1,2, Haiman Wang1,*

    Journal of Renewable Materials, Vol.11, No.4, pp. 1699-1814, 2023, DOI:10.32604/jrm.2022.023805 - 01 December 2022

    Abstract Fiber-reinforced soils have been of great interest to experimenters for building foundations’strength performance, time, and economy. This paper investigates the effects of water content and polypropylene fiber dosage and length on loess’s unconfined compressive strength (UCS) according to the central composite response surface design test procedure. The water content is 11%–25%, the mass ratio of fiber to soil is 0.1%–0.9%, and the fiber length ranges from 6–18 mm. The response surface method (RSM) developed full quadratic models of different variables with response values. After analysis of variance (ANOVA), the mathematical model developed in this study More > Graphic Abstract

    Effect of Polypropylene Fiber on the Unconfined Compressive Strength of Loess with Different Water Content

  • Open Access

    ARTICLE

    An Experimental Study on the Reinforcement of Weakly-Consolidated Shallow Formation in Deep Water Using an Epoxy Resin-Based Fluid

    Leiju Tian1, Yuhuan Bu1,*, Huajie Liu1,*, Lingyun Zhao2,3

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1215-1226, 2023, DOI:10.32604/fdmp.2022.022219 - 30 November 2022

    Abstract The mechanical properties of Portland cement differ from the weakly consolidated shallow formation in deep water. This results in undesired abrupt changes in the compressive strength and elastic modulus at the cement–formation interface. In this study, a water-borne epoxy resin was applied as a strengthening material to reinforce the weakly consolidated shallow formation and protect the cement sheath from potential failure. The mechanical properties of the unconsolidated clay were tested, including their changes with increases in the temperature and curing time. In addition, the effects of the seawater, cement slurry alkaline filtrate, and saltwater drilling More >

  • Open Access

    ARTICLE

    Workability and Strength of Ceramsite Self-Compacting Concrete with Steel Slag Sand

    Suiwei Pan1, Anqi Ren1, Yongli Peng1, Min Wu2, Wanguo Dong3, Chunlin Liu2, Depeng Chen2,*

    Journal of Renewable Materials, Vol.11, No.2, pp. 881-904, 2023, DOI:10.32604/jrm.2022.023000 - 22 September 2022

    Abstract This study focuses on the workability and compressive strength of ceramsite self-compacting concrete with fine aggregate partially substituted by steel slag sand (CSLSCC) to prevent the pollution of steel slag in the environment. The SF, J-ring, visual stability index, and sieve analysis tests are primarily employed in this research to investigate the workability of freshly mixed self-compacting concrete containing steel slag at various steel slag sand replacement rates. The experiment results indicate that CSLSCC with the 20% volume percentage of steel slag (VPS) performs better workability, higher strength, and higher specific strength. The 7-day compressive More > Graphic Abstract

    Workability and Strength of Ceramsite Self-Compacting Concrete with Steel Slag Sand

  • Open Access

    ARTICLE

    The Effect of Basalt Fiber on Concrete Performance under a Sulfate Attack Environment

    Qiang Su, Jinming Xu*

    Journal of Renewable Materials, Vol.11, No.1, pp. 233-244, 2023, DOI:10.32604/jrm.2023.020573 - 10 August 2022

    Abstract To enhance the sulfate attack resistance performance of concrete, Sulfate erosion test was carried out on basalt fiber concrete with different contents, selecting a concentration of 5% sulfate solution and using a dry−wet cycle mechanism attack of basalt fiber-reinforced concrete (BFRC). Every 15 dry−wet cycles, the mass, compressive strength, splitting tensile strength, and relative dynamic elastic modulus of BFRC were tested, and the SO42− concentration was measured. This work demonstrates that the mass, relative dynamic elastic modulus, compressive and splitting tensile strength of BFRC reveal a trend of climb up and then decline with the process… More >

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