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  • Open Access

    ARTICLE

    Study on the Durability of Recycled Powder Concrete against Sulfate Attack under Partial Immersion Condition

    Hualei Bai1,2, Ying Li1,2,*, Dahu Dai1,2

    Journal of Renewable Materials, Vol.10, No.11, pp. 3059-3078, 2022, DOI:10.32604/jrm.2022.020148

    Abstract In order to make full use of waste recycled fine powder (RFP) in concrete and achieve the goal of carbon neutrality in the concrete industry, the durability of sulfate resistance is an important aspect of evaluating the performance of recycled powder concrete (RPC). Therefore, the durability of RPC under partial sulfate immersion was studied to provide theoretical guidance for understanding the erosion mechanism of RPC. The compressive strength, mass loss, and microstructure change patterns of RPC under partial immersion of 5% Na2SO4 and MgSO4 solutions were analyzed by cubic compressive strength, mass loss rate, SEM-EDS, and… More >

  • Open Access

    ARTICLE

    A Mathematical Model and a Method for the Calculation of the Downhole Pressure in Composite-Perforation Technological Processes

    Xufeng Li1,2,3, Yantao Bi1,2,3,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.6, pp. 1699-1709, 2022, DOI:10.32604/fdmp.2022.019741

    Abstract Using the conservation equations for mass, momentum and energy, a model is elaborated to describe the dynamics of high-energy gases in composite-perforation technological processes. The model includes a precise representation of the gunpowder combustion and related killing fluid displacement. Through numerical solution of such equations, the pressure distribution of the high-energy gas in fractures is obtained, and used to determine crack propagation. The accuracy of the model is verified by comparing the simulation results with actual measurements. More > Graphic Abstract

    A Mathematical Model and a Method for the Calculation of the Downhole Pressure in Composite-Perforation Technological Processes

  • Open Access

    ARTICLE

    Evaluation of Various Modification Methods for Enhancing the Performance of Recycled Concrete Aggregate

    Xiaoyan Liu1,*, Li Liu1, Junqing Zuo2, Pingzhong Zhao1, Xian Xie1, Shijie Li1, Kai Lyu3,*, Chunying Wu4, Surendra P. Shah5

    Journal of Renewable Materials, Vol.10, No.10, pp. 2685-2698, 2022, DOI:10.32604/jrm.2022.019527

    Abstract Due to the existence of the attached mortar, the performance of the recycled concrete aggregate (RCA) is inferior to the natural aggregate, which significantly limits its wide application in industry. In this study, five kinds of modified solutions were used to modify the surface of RCA, and the modification effects were compared. The results showed that sodium silicate, nano-silica (NS), Bacillus pasteurii and soybean powder had relatively good modification effects on RCA, which could reduce the crushing value and water absorption, and increase apparent density. The composite solution (15% sodium silicate and 2% NS) and… More >

  • Open Access

    ARTICLE

    Effect of Waste Marble Powder on Physical and Mechanical Properties of Concrete

    Yumei Wang1,3, Jianzhuang Xiao1,*, Jintuan Zhang1,2,4,*

    Journal of Renewable Materials, Vol.10, No.10, pp. 2623-2637, 2022, DOI:10.32604/jrm.2022.019381

    Abstract The emission of greenhouse gases from cement production is an obstacle for sustainable development of construction industry. The use of waste materials in constructions instead of cement could be a feasible solution to green construction. Waste marble powder with good cementing property can be used in concrete partially replace cement. In this research, the effects of using waste marble powder on the physical and mechanical properties of concrete have been studied. Three groups of particle size and five levels of replacement ratio (5%, 10%, 15%, 20%, 25%) for each group have been designed. During the… More >

  • Open Access

    ARTICLE

    Evaluating Simultaneous Impact of Slag and Tire Rubber Powder on Mechanical Characteristics and Durability of Concrete

    Mostafa Amiri1, Farzad Hatami2,*, Emadaldin Mohammadi Golafshani3

    Journal of Renewable Materials, Vol.10, No.8, pp. 2155-2177, 2022, DOI: 10.32604/jrm.2022.019726

    Abstract In this experimental study, the impact of Portland cement replacement by ground granulated blast furnace slag (GGBFS) and micronized rubber powder (MRP) on the compressive, flexural, tensile strengths, and rapid chloride migration test (RCMT) of concrete were assessed. In this study, samples with different binder content and water to binder ratios, including the MRP with the substitution levels of 0%, 2.5% and 5%, and the GGBFS with the substitution ratios of 0%, 20% and 40% by weight of Portland cement were made. According to the results, in the samples containing slag and rubber powder in… More > Graphic Abstract

    Evaluating Simultaneous Impact of Slag and Tire Rubber Powder on Mechanical Characteristics and Durability of Concrete

  • Open Access

    ARTICLE

    Optimization of a High-pressure Water-Powder Mixing Prototype for Offshore Platforms

    Shu Zheng1,*, Yang Yaln2, Shuyu Liu3, Mingxuan Xia1,2, Shaojie Li1,2

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.3, pp. 537-548, 2022, DOI:10.32604/fdmp.2022.018500

    Abstract A new device is designed to promote the mixing of high-pressure water jets and powders in typical industrial applications. The water and powder mixing devices traditionally used on offshore platforms are detrimentally affected by the geometrical configuration of the water nozzle and the powder spraying pipe, which are parallel, resulting in small intersecting volumes of liquid and powder. By allowing the related jets to intersect, in the present work the optimal horizontal distance, vertical distance and intersection angle are determined through a parametric investigation. It is also shown that such values change if the number More >

  • Open Access

    ARTICLE

    PNN-SVM Approach of Ti-Based Powder’s Properties Evaluation for Biomedical Implants Production

    Ivan Izonin1,*, Roman Tkachenko1, Michal Gregus2, Zoia Duriagina1,3, Nataliya Shakhovska1

    CMC-Computers, Materials & Continua, Vol.71, No.3, pp. 5933-5947, 2022, DOI:10.32604/cmc.2022.022582

    Abstract The advent of additive technologies has provided a significant breakthrough in the production of medical implants. It has reduced costs, increased productivity and accuracy of the implant manufacturing process. However, there are problems associated with assessing defects in the microstructure, mechanical and technological properties of alloys, both during their production by powder metallurgy and in the process of 3D printing. Thus traditional research methods of alloys properties demand considerable human, material, and time resources. At the same time, artificial intelligence tools create opportunities for intelligent evaluation of the conformity for the microstructure, phase composition, and… More >

  • Open Access

    ARTICLE

    Effect of Recycled Mixed Powder on the Mechanical Properties and Microstructure of Concrete

    Chao Liu1,2,*, Huawei Liu2,*, Jian Wu1

    Journal of Renewable Materials, Vol.10, No.5, pp. 1397-1414, 2022, DOI:10.32604/jrm.2022.018386

    Abstract In this paper, recycled bricks and recycled concrete were applied to prepare eco-friendly recycled mixed powder (RMP) cementitious material, as a supplementary to replace conventional cement for improve the recycling of construction and demolition waste. Based on the effect of cementitious materials on the hydration of silicate cement, the effects of RMP on the workability, mechanical properties and microstructure of recycled mixed powder concrete (RMPC) with the different replacement ratios and the 8:4 and 6:4 mixing ratio of recycled brick powder (RBP) and recycled concrete powder (RCP) were investigated. The results showed that the fluidity… More >

  • Open Access

    ARTICLE

    Development and Application of a High-Volume Recycled Powder Solidifying Material for Waterworks Sludge

    Xiang Deng1, Sudong Hua1,*, Fan Xia2, Yanfang Zhang2, Dapeng Guo3, Xinxing Zhu3, Defei Zhu3

    Journal of Renewable Materials, Vol.10, No.4, pp. 939-953, 2022, DOI:10.32604/jrm.2022.016874

    Abstract Recycled powder (RP) is produced as a by-product during the process of recycling construction and demolition (C&D) wastes, presenting a low additional value. Using RP-based solidifying material can not only improve its utilization efficiency, but also reduce the cost of commercial solidifying materials. To date, this is the best solidifying material utilized to dispose the original waterworks sludge (OWS) with high moisture contents (60%), and the product could be used to fabricate non-fired bricks. This has become a new environment-friendly technology of “using waste to treat waste”. In this paper, the influence of different particle… More >

  • Open Access

    ARTICLE

    Mechanical Properties and Microcosmic Properties of Self-Compacting Concrete Modified by Compound Admixtures

    Song Yang1, Bing Qi1, Zubin Ai1, Zhensheng Cao1, Shiqin He2,*, Lijun Li3

    Journal of Renewable Materials, Vol.10, No.4, pp. 897-908, 2022, DOI:10.32604/jrm.2022.016653

    Abstract It has become a research hotspot to explore raw material substitutes of concrete. It is important to research the mechanical properties of self-compacting concrete (SCC) with slag powder (SP) and rubber particle (RP) replacing cement and coarse aggregate, respectively. 12 kinds of composite modified self-compacting concrete (CMSCC) specimens were prepared by using 10%, 20% and 30% SP and 30%, 40%, 50% and 60% RP. The rheological properties, mechanical properties and microstructure of the CMSCC were investigated. Results indicate that the workability, compressive strength, splitting tensile strength and flexural strength of CMSCC prepared by 20% SP… More >

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