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Effect of fly ash replacement level on the fracture behavior of concrete

Mahdi AREZOUMANDI, Jeffery S. VOLZ

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4,   Pages 411-418 doi: 10.1007/s11709-013-0228-4

Abstract: This study presents the results of an experimental investigation that evaluates effect of fly ash replacementThis study includes four mixes with 0%, 30%, 50%, and 70% fly ash as a cement replacement.Results of these statistical tests show that the mix with higher level of fly ash replacement level has

Keywords： concrete     fracture energy     fly ash    

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The evolution of surgical and medical treatment of aortic root aneurysm

Xu Yu Jin,Li Yuan,Mario Petrou,John R. Pepper

Frontiers of Medicine 2014, Volume 8, Issue 4,   Pages 427-432 doi: 10.1007/s11684-014-0385-4

Abstract:

Since first report of aortic root replacement in 1968, the surgical risk and long term outcome of

Keywords： aortic root aneurysm     aortic root replacement     valve sparing root replacement     personalised external aortic    

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term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement

Jingwei YING; Feiming SU; Shuangren CHEN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 3,   Pages 302-315 doi: 10.1007/s11709-022-0803-7

Abstract: performance of recycled aggregate concrete (RAC) components for different values of water−cement ratio and replacementGenerally, the concrete strength decreases with the increase of the replacement rate of RCA, in orderto meet the strength requirements when changing the replacement rate of RCA, it is necessary to changeproperties of reinforced concrete beams were tested respectively by changing water−cement ratio and RCA replacementThe brittleness of concrete before failure can be reduced more effectively by adjusting the replacement

Keywords： recycled concrete     beam     the replacement rate of recycled coarse aggregate     water–cement ratio     digital    

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Recycled glass replacement as fine aggregate in self-compacting concrete

Yasser SHARIFI, Mahmoud HOUSHIAR, Behnam AGHEBATI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4,   Pages 419-428 doi: 10.1007/s11709-013-0224-8

Abstract: as much as possible, the concrete industry has adopted a number of methods to achieve this goal by replacementTherefore, replacement of waste glass with fine aggregate in SCC should deeply be investigated comparedThe aim of the present study is to investigate the effect of glass replacement with fine aggregate onThe strength reduction of concrete in different glass replacement ratios is not remarkable, thus it can

Keywords： Self Compacting Concrete (SCC)     recycle glass     fine aggregate     fresh and hardened properties    

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Utilization of MSWI fly ash as partial cement or sand substitute with focus on cementing efficiency and health risk assessment

Lei Zheng, Xingbao Gao, Wei Wang, Zifu Li, Lingling Zhang, Shikun Cheng

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 1, doi: 10.1007/s11783-019-1184-6

Abstract: Sand replacing is beneficial for strength, while cement replacement reduces strength.highest strength (compressive strength= 30.2 Mpa; flexural strength= 7.0 Mpa) was obtained when the sand replacementThe k values of fly ash used for sand replacement were all significantly above that used for cement substitutionThe macropores assigned to the gaps between particles decreased when the fly ash was used as sand replacement

Keywords： MSWI fly ash     Cementing efficiency     Health risk assessment of heavy metal     Sand replacement     Cement replacement    

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left ventricular remodelling and clinical outcome following surgical and trans-catheter aortic valve replacement

Frontiers of Medicine 2021, Volume 15, Issue 3,   Pages 416-437 doi: 10.1007/s11684-021-0852-7

Abstract: Over the last half century, surgical aortic valve replacement (SAVR) has evolved to offer a durable and

Keywords： surgical aortic valve replacement     trans-catheter aortic valve implantation     left ventricular hypertrophy    

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Determination Model for Replacement of Water Pipeline

Cui Hongsheng,Zhang Hongwei,Niu Zhiguang,Fu Yufen

Strategic Study of CAE 2007, Volume 9, Issue 9,   Pages 68-71

Abstract:

A fund distribution model for water pipeline replacement at the levelconstruction fee,  and decreasing the difference of pipeline maintenance fee before and after replacement

Keywords： water pipeline     maintenance fee     replacement fee     fund distribution    

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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: The two main factors considered were the recycled coarse aggregate (RCA) replacement percentage and thethat the punching shear capacity, ductility and energy consumption decreased with the increase of RCA replacement

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

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hardened properties of high-strength concrete incorporating byproduct fine crushed aggregate as partial replacement

Dammika P. K. WELLALA, Ashish Kumer SAHA, Prabir Kumar SARKER, Vinod RAJAYOGAN

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 124-135 doi: 10.1007/s11709-020-0673-9

Abstract: By the replacement of 40% FCAs, the slump and bleeding of concrete with a water-to-cement ratio of 0.45provided in the AS 3600 and ACI 318 design standards are applicable for concrete using the FCAs as partial replacement

Keywords： fine crushed aggregates     quarry dust     compressive strength     splitting tensile strength     drying shrinkage    

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Fuel type preference of taxi driver and its implications for air emissions

Feng WANG,Beibei LIU,Bing ZHANG,Jun BI

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 4,   Pages 702-711 doi: 10.1007/s11783-014-0665-x

Abstract: To investigate the energy replacement pattern as well as the pollutants reduction potential of the taxiDifferent from the previous studies which focused on the early stage of cleaner fuel replacement, taxi

Keywords： fuel preference     energy replacement     environmental impacts     taxi    

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Experimental and modeling studies on installation of arc sprayed Zn anodes for protection of reinforced concrete structures

Xianming SHI

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 1,   Pages 1-11 doi: 10.1007/s11709-016-0312-7

Abstract: Arc sprayed zinc (Zn) anode on concrete surfaces has been an emerging technology for protecting reinforced concrete structures from rebar corrosion in coastal environments. Many cathodic protection (CP) systems with arc sprayed Zn anodes will reach or exceed their design life in the near future and thus may function improperly or insufficiently, making it necessary to replace the aged anodes. However, prior to this study, little was known about the most effective profile for the concrete surface, for either new concrete or old concrete with existing Zn anodes removed. This work develops criteria to properly prepare the concrete surface before the application of new Zn anode. Experimental studies were conducted both in the laboratory and for a field structure in Oregon. Artificial neural network was used to achieve better understanding of the complex cause-and-effect relationships inherent in the Zn-mortar or Zn–concrete systems and was successful in finding meaningful, logical results from the bond strength data. The goal is to achieve strong initial bond strength of new Zn to concrete, which is essential for long-term performance of the CP system. The results from this case study suggest that it is necessary to adjust the anode removal and surface sandblasting based on the electrochemical age of the existing concrete. In all cases of sandblasting, minimize the exposure of large aggregates (e.g., those bigger than 19 mm in diameter).

Keywords： arc sprayed Zn     anode replacement     reinforced concrete     bridge preservation     neural networks     surface profile    

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Effects of seeding nucleation agent on geopolymerization process of fly-ash geopolymer

Lapyote PRASITTISOPIN, Issara SEREEWATTHANAWUT

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 1,   Pages 16-25 doi: 10.1007/s11709-016-0373-7

Abstract: Geopolymer, an inorganic aluminosilicate material activated by alkaline medium solution, can perform as an inorganic adhesive. The geopolymer technology has a viability to substitute traditional concrete made of portland cement (PC) because replacing PC with fly ash leads to reduced carbon dioxide emissions from cement productions and reduced materials cost. Although fly ash geopolymer stimulates sustainability, it is slow geopolymerization reaction poses a challenge for construction technology in term of practicality. The development of increasing geopolymerization reaction rate of the geopolymer is needed. ?The purpose of this study is to evaluate seeding nucleation agents (NA) of fly ash geopolymer that can accelerate polymerization reactions such that the geopolymer can be widely used in the construction industry. Results from the present study indicate that the use of NA (i.e., Ca(OH) ) can be potentially used to increase geopolymerization reaction rate and improve performance characteristics of the fly ash geopolymer product.

Keywords： fly ash     geopolymer     nucleation agent     portland cement replacement    

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Frontier science and challenges on offshore carbon storage

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 7, doi: 10.1007/s11783-023-1680-6

Abstract:

● The main direct seal up carbon options and challenges are reviewed.

Keywords： Offshore carbon storage     Direct CO2 injection     CO2-CH4 replacement    

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The Experimental Study of Controlling the Spout Temperature of HEAE

Zhang Yongfeng,Liao Guangxuan,Zhou Xiaomeng,Pan Renming,Wang Hua

Strategic Study of CAE 2006, Volume 8, Issue 3,   Pages 79-82

Abstract:

Highly effective aerosol fire-extinguishing agent (HEAE) is a safe and practical alternative to Halon which developed from pyrotechnics. When HEAE starts up, it generates aerosol products with high temperature so that its temperature must be lowered to not harmful to person and material. Aerosol products are cooled with exterior cooling by use of chemical coolant. This article mainly discussed the influences of refrigerant contents, apertures, proportion of refrigerant on the spout temperature of HEAE.

Keywords： aerosol fire extinguishing agent     Halon replacement     cooling    

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

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

Abstract: results show that the compressive strength of SSRAC increase with decreasing recycled coarse aggregate replacement

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

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Title Author Date Type Operation

Effect of fly ash replacement level on the fracture behavior of concrete

Mahdi AREZOUMANDI, Jeffery S. VOLZ

Journal Article

The evolution of surgical and medical treatment of aortic root aneurysm

Xu Yu Jin,Li Yuan,Mario Petrou,John R. Pepper

Journal Article

term performance of recycled concrete beams with different water–cement ratio and recycled aggregate replacement

Jingwei YING; Feiming SU; Shuangren CHEN

Journal Article

Recycled glass replacement as fine aggregate in self-compacting concrete

Yasser SHARIFI, Mahmoud HOUSHIAR, Behnam AGHEBATI

Journal Article

Utilization of MSWI fly ash as partial cement or sand substitute with focus on cementing efficiency and health risk assessment

Lei Zheng, Xingbao Gao, Wei Wang, Zifu Li, Lingling Zhang, Shikun Cheng

Journal Article

left ventricular remodelling and clinical outcome following surgical and trans-catheter aortic valve replacement

Journal Article

Determination Model for Replacement of Water Pipeline

Cui Hongsheng,Zhang Hongwei,Niu Zhiguang,Fu Yufen

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

hardened properties of high-strength concrete incorporating byproduct fine crushed aggregate as partial replacement

Dammika P. K. WELLALA, Ashish Kumer SAHA, Prabir Kumar SARKER, Vinod RAJAYOGAN

Journal Article

Fuel type preference of taxi driver and its implications for air emissions

Feng WANG,Beibei LIU,Bing ZHANG,Jun BI

Journal Article

Experimental and modeling studies on installation of arc sprayed Zn anodes for protection of reinforced concrete structures

Xianming SHI

Journal Article

Effects of seeding nucleation agent on geopolymerization process of fly-ash geopolymer

Lapyote PRASITTISOPIN, Issara SEREEWATTHANAWUT

Journal Article

Frontier science and challenges on offshore carbon storage

Journal Article

The Experimental Study of Controlling the Spout Temperature of HEAE

Zhang Yongfeng,Liao Guangxuan,Zhou Xiaomeng,Pan Renming,Wang Hua

Journal Article

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

Journal Article