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Influence of High-Density Polyethylene Admixtures on Water Sorptivity Behaviour of Medium and High strength Concretes

1jscbe2025-01-14

Abstract

Influence of High-Density Polyethylene Admixtures on Water Sorptivity Behaviour of Medium and High strength Concretes

Journal: Sustainable Cities & Built Environment (JSCBE)

Authors: Iorwuese Anum, Adole Michael Adole, Umar Abdullahi, and Changlia Hassan Salihu

This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

DOI: https://doi.org/10.58757/jscbe.crbcd.01

The increasing research interest in the reuse of waste plastics have presented vast potentials for improving concrete properties and contributing to sustainable concrete production. This work studied the sorptivity behaviour of grades M25 and M50 concretes prepared using pulverised high density polyethylene (HDPE) immersed in 20% hydrogen peroxide as treatment. As an additive, the pulverised HDPE was added to the concrete at 0 %, 0.25 %, 0.5 %, 0.75 %, and 1 % based on cement weight. The concrete had been made with 150 mm3 steel moulds using mix design method. A superplasticiser -Hydroplast-500, was used in the mixes. For the grades M25 and M50 concretes, respectively, 0.4 and 0.36 water/cement ratios had been selected to represent medium and high strengths concretes after 7, 28, and 90-day periods of water cure. After being taken from the water and dried, the concrete cubes underwent a sorptivity test. Results obtained indicated that incorporation of treated HDPE to the concrete reduced its sorptivity up to 59% and 64.5% respectively for grades M25 and M50 concretes due to the admixture’s existence in the mix. The study recommends concrete prepared with 1% HDPE by weight of cement for use in water retaining structures, drainage systems and constructions where damp is a challenge to existing infrastructure.
FieldValue
Pages01-14
Year2025
Issue1
Volume03
Posted by Basem

1jscbe2023-01-23

Abstract

IMPACT OF STREET PATH’S FORM ON ACHIEVING HUMAN SCALE IN A CITY

Journal: Sustainable Cities & Built Environment (JSCBE)

Authors: Ashraf M. Soliman

This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

DOI: 10.58757/jscbe.crbcd.01.23

A city’s human scale can be achieved if people recognized the four Cardinal Directions (CDs) anywhere within the city. As a reflection of the theory of ‘prospect and refuge,’ this paper investigates the problem of losing a city’s human scale, by studying the impact of the form of the street paths on maintaining and perception of the four CDs. The paper highlights the problem of a non-designed street network and the heterogeneity of its texture. The paper explores the impact of such random street networks on achieving the human scale of cities. Kharga City in Egypt located on (25.4390° N, 30.5586° E) is an example of cities suffering from non-designed street networks. Therefore, the paper relied on the inferential statistics approach by surveying a sample of residents in Kharga City, with the assumption that, the main reason for that problem was the various curves existing in the street paths, which had different shapes, sizes, diameters, and directions. Moreover, the lack of a typical street network pattern had aggravated the problem. Analysis and results confirmed the hypothesis of the research, hence basic recommendations were made. The most important of which is, the need to avoid random curves in street directions, and to follow the orthogonal grid pattern, mainly in the design of street networks, in order to ensure a city with human-scale, that is easy to recognize its correct mental map.

 

FieldValue
Pages01-23
Year2023
Issue1
Volume01
Posted by Basem

1jscbe2025-01-23

Abstract

ENHANCING MORTGAGE ACCESSIBILITY IN DEVELOPING ECONOMIES: INSIGHTS FROM BANK CREDIT PROFESSIONALS IN GREATER KAMPALA METROPOLITAN AREA, UGANDA

Journal: Sustainable Cities & Built Environment (JSCBE)

Authors: Margaret Nakiwala, Stephen Mukiibi, Amos Chom Haruna, Nathan Kibwam

This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

DOI: 10.58757/jscbe.emade.01.23

Access to mortgage financing is a significant challenge in developing countries, including Uganda, hindering the growth of the housing sector. This study explores the perceptions of bank credit professionals regarding clients’ awareness, attitudes, and challenges related to mortgage eligibility terms in the Greater Kampala Metropolitan Area. Employing a qualitative approach, indepth Key Informant Interviews were conducted with six credit professionals from two major financial institutions. The findings reveal that over 75% of applicants fail to meet the stringent eligibility criteria, with key barriers identified as high interest rates averaging around 21%, substantial down payment requirements of 20% to 30%, and rigid collateral stipulations. Credit professionals suggested strategies to alleviate these challenges, including relaxing eligibility conditions, accepting alternative collateral, and encouraging self-financing through investment returns. The study highlights the urgent need for enhanced stakeholder collaboration to improve mortgage accessibility and affordability. Policy implications include reducing interest rates, revising eligibility criteria, and strict measures against corruption within financial institutions. Implementing these recommendations is vital for making mortgage financing more attainable for housing developers in the GKMA, thereby fostering a more inclusive housing market in Uganda.

 

FieldValue
Pages01-23
Year2025
Issue3
Volume01
Posted by Dania