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A new systematic firefly algorithm for forecasting the durability of reinforced recycled aggregate concrete

Wafaa Mohamed SHABAN; Khalid ELBAZ; Mohamed AMIN; Ayat gamal ASHOUR

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 3,   Pages 329-346 doi: 10.1007/s11709-022-0801-9

Abstract: This study presents a new systematic algorithm to optimize the durability of reinforced recycled aggregateimprove the firefly performance in forecasting the chloride penetrability of strengthened recycled aggregatenine effective parameters, including concrete components and fundamental characteristics of recycled aggregate

Keywords： chloride penetrability     recycled aggregate concrete     machine learning     concrete components     durability    

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Laboratory assessment of Alaska aggregates using Micro-Deval test

Jenny LIU,Sheng ZHAO,Anthony MULLIN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 1,   Pages 27-34 doi: 10.1007/s11709-016-0359-5

Abstract: Aggregates suitable for use in asphalt concrete (AC) pavement construction must meet durability criteriaThus, it is critical to select appropriate tests to properly characterize aggregate durability.In Alaska, durability tests currently being used for aggregates in AC pavement include Los Angeles (LAinvestigate the feasibility of using Micro-Deval test, commonly used in other states, to evaluate the durabilityBased on the testing results, it is found that using Micro-Deval test for durability assessment of Alaska

Keywords： aggregate durability     Washington degradation test     Micro-Deval test    

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A comprehensive assessment on the durability of gas diffusion electrode materials in PEM fuel cell stack

Arunkumar JAYAKUMAR

Frontiers in Energy 2019, Volume 13, Issue 2,   Pages 325-338 doi: 10.1007/s11708-019-0618-y

Abstract: Though it has found its applications in numerous fields, the cost and durability are key barriers impedingand functional properties of various materials involved in the GDE can help us to address the related durabilityThis paper reviews the key GDE components, and in specific, the root causes influencing the durabilityalso envisages the role of novel materials and provides a critical recommendation to improve the GDE durability

Keywords： PEM fuel cell     gas diffusion electrode(GDE)     gas diffusion layer(GDL)     membrane electrode assembly     durability    

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Experimental study on behavior of mortar-aggregate interface after elevated temperatures

Wan WANG, Jianzhuang XIAO, Shiying XU, Chunhui WANG

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 158-168 doi: 10.1007/s11709-016-0374-6

Abstract: A push-out test program was designed and conducted to study the meso-scale behavior of mortar-aggregatetemperatures ranging from 20°C to 600°C with the concept of modeled concrete (MC) and modeled recycled aggregateThe properties of recycled aggregate concrete (RAC) may be more sensitive to elevated temperatures thanthose of natural aggregate concrete (NAC) due to the fact that the interfacial properties of RAC are

Keywords： mortar-aggregate interface     push-out test     elevated temperatures     modeled concrete (MC)     modeled recycledaggregate concrete (MRAC)    

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Influence of steel corrosion on axial and eccentric compression behavior of coral aggregate concrete

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1415-1425 doi: 10.1007/s11709-021-0786-9

Abstract: To study the behavior of coral aggregate concrete (CAC) column under axial and eccentric compression,The durability of CAC structures can be improved by using new organic coated steel.

Keywords： coral aggregate concrete column     axial compression     eccentric compression     steel corrosion     calculation    

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Chloride ingress and macro-cell corrosion of steel in concrete made with recycled brick aggregate

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1358-1371 doi: 10.1007/s11709-021-0769-x

Abstract: investigation on chloride ingress and macro-cell corrosion of steel bars in concrete made with recycled brick aggregateAs control cases, virgin brick aggregate (BA) and stone aggregate (SA) were also investigated.The chloride ingress as well as corrosion of steel bars in concrete made with the different types of aggregate

Keywords： brick aggregate     chloride ingress     macro-cell corrosion     recycled brick aggregate    

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Destructive and non-destructive evaluation of concrete for optimum sand to aggregate volume ratio

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1400-1414 doi: 10.1007/s11709-021-0779-8

Abstract: As such, a detailed experimental investigation was carried out to evaluate the effect of sand-to-aggregate, cement content (340 and 450 kg/m3), water-to-cement ratio (0.45 and 0.50), and maximum aggregateThe careful analysis demonstrates that aggregate proportions and size need to be optimized for formulatingmix designs; optimum ratios of s/a were found to be 0.40 and 0.44 for the maximum aggregate

Keywords： aggregates     non-destructive testing     sand-to-aggregate volume ratio (s/a)     maximum aggregate    

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Cement mortar with enhanced flexural strength and durability-related properties using

Qing LIU, Renjun LIU, Qiao WANG, Rui LIANG, Zongjin LI, Guoxing SUN

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 99-108 doi: 10.1007/s11709-021-0721-0

Abstract: micro-and-pore structures, hydrated products, interactions between cement hydrates and polyacrylamide (PAM), and durability-related

Keywords： acrylamide     in situ polymerization     interaction     porosity     durability    

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additives and permeability reducing admixtures having different action mechanisms on mechanical and durability

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1277-1291 doi: 10.1007/s11709-021-1752-2

Abstract: In this paper, the effect of usage of the permeability reducing admixture (PRA) having different action mechanisms on hardened state properties of cementitious systems containing mineral additives is examined. For this aim, three commercial PRAs were used during investigation. The effective parameters in the first and third PRAs were air-entraining and high-rate air-entraining, respectively. The second one contained the insoluble calcium carbonate residue and had a small amount of the air-entraining property. Mortar mixes with binary and ternary cementitious systems were prepared by partially replacing cement with fly ash and metakaolin. The hardened state properties of mortar mixtures such as compressive strength, ultrasonic pulse velocity, water absorption, drying shrinkage and freeze–thaw resistance were investigated. The ternary cement-based mixture having both fly ash and metakaolin was selected as the most successful mineral-additive bearing mix in regard to hardened state properties. In this sense, PRA-B, with both insoluble residues and a small amount of air-entraining properties, showed the best performance among the mixtures containing PRA. The combined use of mineral additive and PRA had a more positive effect on the properties of the mixes.

Keywords： cementitious system     mineral additive     permeability reducing admixture     mechanical properties     durability    

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Punching shear behavior of recycled aggregate concrete slabs with and without steel fibres

Jianzhuang XIAO, Wan WANG, Zhengjiu ZHOU, Mathews M. TAWANA

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 725-740 doi: 10.1007/s11709-018-0510-6

Abstract: A study on the punching shear behavior of 8 slabs with recycled aggregate concrete (RAC) was carriedThe two main factors considered were the recycled coarse aggregate (RCA) replacement percentage and the

Keywords： recycled aggregate concrete     steel fibres     slab     punching shear     recycled coarse aggregates replacement percentage    

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Quantification of coarse aggregate shape in concrete

Xianglin GU,Yvonne TRAN,Li HONG

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 3,   Pages 308-321 doi: 10.1007/s11709-014-0266-6

Abstract: The objective of this study is to choose indices for the characterization of aggregate form and angularityFor this purpose, several parameters for aggregate form and angularity featured in previous researchThis paper also analyzes the statistical distributions of parameters for aggregate form and angularityeach other, respectively; and consequently, the independent parameters could be used to quantify the aggregateform and angularity for the purpose to study the influence of aggregate shape on the mechanical behavior

Keywords： coarse aggregate     form     angularity     digital image analysis     statistical distribution     splitting tensile strength    

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Effects of coarse and fine aggregates on long-term mechanical properties of sea sand recycled aggregate

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 754-772 doi: 10.1007/s11709-021-0711-2

Abstract: Typical effects of coarse and fine aggregates on the long-term properties of sea sand recycled aggregateSupportive results show that the compressive strength of SSRAC increase with decreasing recycled coarse aggregateaggregates on the axial deformation of SSRAC is clear; however, the deformation differences between coarse aggregateThe aggregate type changes the crack characteristics and propagation of SSRAC.

Keywords： sea sand recycled aggregate concrete     recycled coarse aggregate replacement percentage     sea sand chloride    

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Understanding the behavior of recycled aggregate concrete by using thermogravimetric analysis

Subhasis PRADHAN, Shailendra KUMAR, Sudhirkumar V. BARAI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1561-1572 doi: 10.1007/s11709-020-0640-5

Abstract: The physio-chemical changes in concrete mixes due to different coarse aggregate (natural coarse aggregateand recycled coarse aggregate (RCA)) and mix design methods (conventional method and Particle PackingRecycled aggregate concrete (RAC) mixes exhibit higher and after 7 d of curing, contrary to that afterThe compressive strength of concrete and cannot be correlated for concrete mixes with different aggregateIn this regard, further study on the influence of interfacial transition zone, voids content and aggregate

Keywords： recycled aggregate concrete     Particle Packing Method     thermogravimetric analysis     chemically bound water    

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Comments on “Prediction on CO uptake of recycled aggregate concrete”, Frontiers of Structural and Civil

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1504-1506 doi: 10.1007/s11709-021-0782-0

Abstract: A methodology to compute the CO2 uptake of recycled aggregate concrete is proposed in the
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Experimental investigation on freeze−thaw durability of polymer concrete

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 1038-1046 doi: 10.1007/s11709-021-0748-2

Abstract: Assessing the durability of concrete is of prime importance to provide an adequate service life and reduceconcrete (PC) specimens prepared with higher dosages of polymer contents possessed better freeze–thaw durabilityThis high durability performance of PCs is mainly due to their impermeable microstructures, absence of

Keywords： durability test     freeze-thaw resistance     polymer concrete     residual compressive strength     ASTM C666-15    

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Title Author Date Type Operation

A new systematic firefly algorithm for forecasting the durability of reinforced recycled aggregate concrete

Wafaa Mohamed SHABAN; Khalid ELBAZ; Mohamed AMIN; Ayat gamal ASHOUR

Journal Article

Laboratory assessment of Alaska aggregates using Micro-Deval test

Jenny LIU,Sheng ZHAO,Anthony MULLIN

Journal Article

A comprehensive assessment on the durability of gas diffusion electrode materials in PEM fuel cell stack

Arunkumar JAYAKUMAR

Journal Article

Experimental study on behavior of mortar-aggregate interface after elevated temperatures

Wan WANG, Jianzhuang XIAO, Shiying XU, Chunhui WANG

Journal Article

Influence of steel corrosion on axial and eccentric compression behavior of coral aggregate concrete

Journal Article

Chloride ingress and macro-cell corrosion of steel in concrete made with recycled brick aggregate

Journal Article

Destructive and non-destructive evaluation of concrete for optimum sand to aggregate volume ratio

Journal Article

Cement mortar with enhanced flexural strength and durability-related properties using

Qing LIU, Renjun LIU, Qiao WANG, Rui LIANG, Zongjin LI, Guoxing SUN

Journal Article

additives and permeability reducing admixtures having different action mechanisms on mechanical and durability

Journal Article

Punching shear behavior of recycled aggregate concrete slabs with and without steel fibres

Jianzhuang XIAO, Wan WANG, Zhengjiu ZHOU, Mathews M. TAWANA

Journal Article

Quantification of coarse aggregate shape in concrete

Xianglin GU,Yvonne TRAN,Li HONG

Journal Article

Effects of coarse and fine aggregates on long-term mechanical properties of sea sand recycled aggregate

Journal Article

Understanding the behavior of recycled aggregate concrete by using thermogravimetric analysis

Subhasis PRADHAN, Shailendra KUMAR, Sudhirkumar V. BARAI

Journal Article

Comments on “Prediction on CO uptake of recycled aggregate concrete”, Frontiers of Structural and Civil

Journal Article

Experimental investigation on freeze−thaw durability of polymer concrete

Journal Article