Calculating Dynamic Strengths of Concrete Subjected to Impact Load

2021 ◽  
Vol 895 ◽  
pp. 12-19
Author(s):  
Zainab Hasan Abdulabbas ◽  
Layth Abdul Rasool Al Asadi
Keyword(s):  
Coarse Aggregate ◽  
Impact Load ◽  
Dynamic Properties ◽  
Waste Materials ◽  
Sustainable Concrete ◽  
Metal Waste ◽  
Fast Decrease ◽  
Natural Land ◽  
Concrete Mechanical Properties

The objective of this paper is to calculate the influential properties of concrete. These are the dynamic properties of sustainable concrete in the situation in which metal waste can found within its components. Growing the rate of pollution in the world, a fast decrease of the original resource, the requirement for utilization more areas of natural land, and increase the price of the newly available area are the reasons that make the researchers give great attention to the new concrete (green concrete) and destruction of unwanted material in the green mix. The concept of reuse aimed at sustainable structures was implemented within the current paper through consuming metal waste of cans and bottle caps in concrete. The waste materials were consumed in two modes; at 1st mode, it was applied in the role of fibres and mixed using 15% by weight of cement. On the 2nd mode, it was applied as coarse aggregate with 25% replaced by volume. The procedure includes testing 4 concrete mixes. The estimated properties were the flexural and compressive strengths, besides modulus of elasticity. Adding bottle caps (waste materials fibres) in concrete led to enhancement in strengths. The use of walls of cans (waste materials fibres) in concrete reduced the strengths. While in the case of compacted bottle caps plus pull-tab of cans (waste materials aggregate), concrete mechanical properties a little below the reference mix. The dynamic properties of concrete contain these types of waste under impact load were determined. As known, the dynamic properties are so helpful in the strategy that deals with civil constructions put in danger of impact loads like runways, gas explosion, etc. CEB-FIP (2010) code provides wide-ranging formulas to predict the strain change of concrete. The dynamic properties are determined by this code with consideration strain level between (10-2-100). In this range, dynamic loads in the civil constructions at the level of quasi-static strain were predicted.

Sustainable Concrete by Partially Replacing Coarse Aggregate Using Coconut Shell

2014 ◽  
Vol 2 (1) ◽  
pp. 41-54 ◽  
Author(s):  
Damre Shraddha ◽  
Firake Hitali ◽  
Dode Pradeep ◽  
Shrikant Varpe
Keyword(s):  
Coarse Aggregate ◽  
Coconut Shell ◽  
Sustainable Concrete

scholarly journals The Role of Biophilic Agents in Building a Green Resilient City; the Case of Birmingham, UK

2021 ◽  
Vol 13 (9) ◽  
pp. 5033
Author(s):  
Linda Novosadová ◽  
Wim van der Knaap
Keyword(s):  
Urban Planning ◽  
Urban Governance ◽  
Small Scale ◽  
Climate Resilience ◽  
Natural Land ◽  
Negative Impacts ◽  
Community Projects ◽  
Business As Usual ◽  
The City

The present research offers an exploration into the biophilic approach and the role of its agents in urban planning in questions of building a green, resilient urban environment. Biophilia, the innate need of humans to connect with nature, coined by Edgar O. Wilson in 1984, is a concept that has been used in urban governance through institutions, agents’ behaviours, activities and systems to make the environment nature-inclusive. Therefore, it leads to green, resilient environments and to making cities more sustainable. Due to an increasing population, space within and around cities keeps on being urbanised, replacing natural land cover with concrete surfaces. These changes to land use influence and stress the environment, its components, and consequently impact the overall resilience of the space. To understand the interactions and address the adverse impacts these changes might have, it is necessary to identify and define the environment’s components: the institutions, systems, and agents. This paper exemplifies the biophilic approach through a case study in the city of Birmingham, United Kingdom and its biophilic agents. Using the categorisation of agents, the data obtained through in-situ interviews with local professionals provided details on the agent fabric and their dynamics with the other two environments’ components within the climate resilience framework. The qualitative analysis demonstrates the ways biophilic agents act upon and interact within the environment in the realm of urban planning and influence building a climate-resilient city. Their activities range from small-scale community projects for improving their neighbourhood to public administration programs focusing on regenerating and regreening the city. From individuals advocating for and educating on biophilic approach, to private organisations challenging the business-as-usual regulations, it appeared that in Birmingham the biophilic approach has found its representatives in every agent category. Overall, the activities they perform in the environment define their role in building resilience. Nonetheless, the role of biophilic agents appears to be one of the major challengers to the urban design’s status quo and the business-as-usual of urban governance. Researching the environment, focused on agents and their behaviour and activities based on nature as inspiration in addressing climate change on a city level, is an opposite approach to searching and addressing the negative impacts of human activity on the environment. This focus can provide visibility of the local human activities that enhance resilience, while these are becoming a valuable input to city governance and planning, with the potential of scaling it up to other cities and on to regional, national, and global levels.

COMPLEMENTARITY, SUBSTITUTABILITY AND STRATEGIC ACCUMULATION OF CAPITAL

2002 ◽  
Vol 04 (04) ◽  
pp. 371-390 ◽  
Author(s):  
CHARLES FIGUIERES
Keyword(s):  
Differential Games ◽  
Capital Accumulation ◽  
Dynamic Properties ◽  
Initial Condition ◽  
Long Run

The preemptive role of capital is analyzed in a class of differential games of capital accumulation with reversible investment for two symmetric players. Two dynamic concepts of interaction are defined: feedback substitutability and feedback complementarity. These concepts are useful for exploring the dynamic properties of the stocks. In particular it is proved that if the equilibrium of the game is characterized by feedback substitutability, the firm with the higher initial condition overshoots his long-run level of capital.

Durability properties of sustainable concrete containing high volume palm oil waste materials

2016 ◽  
Vol 137 ◽  
pp. 167-177 ◽  
Author(s):  
Mohammad Momeen Ul Islam ◽  
Kim Hung Mo ◽  
U. Johnson Alengaram ◽  
Mohd Zamin Jumaat
Keyword(s):  
Palm Oil ◽  
High Volume ◽  
Waste Materials ◽  
Sustainable Concrete ◽  
Durability Properties

Structural, Dynamic Properties of Key Residues in Aβ Amyloidogenesis: Implications of an Important Role of Nanosecond Timescale Dynamics

ChemBioChem ◽  
2007 ◽  
Vol 8 (11) ◽  
pp. 1251-1254 ◽  
Author(s):  
Kwang Hun Lim ◽  
Ginger L. Henderson ◽  
Abhishek Jha ◽  
Martti Louhivuori
Keyword(s):  
Dynamic Properties ◽  
Structural Dynamic ◽  
Key Residues

scholarly journals Learning from prices: information aggregation and accumulation in an asset market

2020 ◽  
Author(s):  
Michele Berardi
Keyword(s):  
Private Information ◽  
Dynamic Properties ◽  
Public Information ◽  
Information Aggregation ◽  
Time Varying ◽  
Private Signals ◽  
Private And Public ◽  
Fundamental Value ◽  
Over Time

Abstract Can prices convey information about the fundamental value of an asset? This paper considers this problem in relation to the dynamic properties of the fundamental (whether it is constant or time-varying) and the structure of information available to agents. Risk-averse traders receive two potential signals each period: one exogenous and private and the other, prices, endogenous and public. Prices aggregate private information but include aggregate noise. Information can accumulate over time both through endogenous and exogenous signals. With a constant fundamental, the precision of both private and public cumulative information increases over time but agents put progressively more weight on the endogenous signals, asymptotically disregarding private ones. If the fundamental is time-varying, the use of past private signals complicates the role of prices as a source of information, since it introduces endogenous serial correlation in the price signal and cross-correlation between it and innovations in the fundamental. A modified version of the Kalman filter can still be used to extract information from prices and results show that the precision of the endogenous signals converges to a constant, with both private and public information used at all times.

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