Study On The Strength Properties Of
Fly Ash Fibre Reinforced Concrete
P Rama Mohan Rao
An experimental study on fly ash concrete reinforced with different fibres was conducted for this
study. Concrete containing different types of hybrid fibres at constant volume fraction (1.0%) was
used for this study. The replacement level of cement by class C fly ash 40%, and metallic and non
metallic fibres were used. For each mix standard sizes of cubes, cylinders and prisms as per Indian
standards were used and tested for the strength properties such as compressive strength, split tensile
strength, flexural strength and modulus of elasticity at the age of 28 days as per the Indian
standard procedure. The test results show that the fibres when used in hybrid form could result in
good composite performance compared to their individual fibre reinforced concretes.
Influence Of Cultural Diversity Among Artisans On Construction Sites In Abuja-Nigeria
Jimoh Richard Bamgbade Adebisi and Kuroshi Peter
Migration of people from one place to the other nationally and internationally has given rise to diverse workforce which have added more value to many organisations including construction firms. Construction firms should be realistic about the diversity of different tribes on site and explore adequate measures aimed at effective management of this diversity. There are varied distributions of tribes on construction sites. This varied distribution affects the behaviour and effectiveness of site workers. Hence, this study appraises cultural diversity in construction sites in Abuja through combination of personal observations and structured interviews at twenty construction sites. Twenty sites were carefully observed and ten managers were interviewed for this study. The findings show the level of mixture of tribes on the construction sites, the languages of expression among the varied site workers and their interaction with one another as they interact and work together. It is very important for the construction firms to put measures in place to explore the advantages of diverse workforce as well as mitigate on the minuses to boost productivity. It is therefore expedient for the construction firms to create cultural awareness on sites translating the safety slogans, sign posts in different languages that are representative of the workforce in order to have optimum productivity.
Construction Site, Diversity, Language, Migration, Tribe
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Research Articles
Scorecard Approach To Assess Factors Causing Concrete Waste In Building Construction Projects
Sameersinh V. Alone and Priyadarshi H. Sawant
Application of concrete in building construction industry is increasing with the advancement of technology, innovations in concrete and formwork system and in need of speedier construction. Being 'A' class item, concrete consumes considerable amount of project funds. It needs careful handling to avoid wastage and not to lose the profit margin. Many times, actual percentage of waste generation is much higher than the envisaged; initially causing needless utilization of resources. Lack of appropriate quantitative measurement systems put forth many challenges to project managers to control the waste. Although waste minimization is identified as one of the key factors for achieving sustainable construction and enhancing productivity, waste management is getting ignored on site in the absence of fully developed and easy to use assessment systems. An attempt is made in this paper to overcome this limitation by introducing a score card assessment system to measure concrete waste in multi storey building projects. Questionnaire survey is carried out to identify factors causing concrete waste. As a result of this work, 50 such factors are identified. An assessment tool is developed by prioritising these factors and further computing their influence level, scoring and weightages on generating concrete waste. The tool can be further tested and used as a diagnosis tool to audit concrete waste on construction sites.
Waste, construction and demolition waste, Waste management, Construction waste source, Waste control
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Research Articles
Estimation Of Aggregate Zonal Trips Using Univariate And Multivariate Linear Regression Models
Prasanta K. Sahu, Satish Sharma and Hyuk-Jae Roh
Estimation of trips is critical for transportation infrastructure development. The selection of trip estimation methods depends on data sources, contents of study, level of detail, accuracy of forecasting, even time and budget, and available software. The trip generation consists of trip production and trip attraction for a zone. Conventionally, regression techniques are widely used for aggregate or disaggregate level of trip generation models. In this context, this study focuses on a comparative analysis of two different model structures for estimating the trip generation models. The models are estimated and validated by using 144 zonal aggregate level data. The statistical significance of all the independent variables used in the model is established by conducting tests such as R2, Adj. R,2 F-test, and t-test. The models are validated with about 15% of the data, which are selected randomly. The predictive validations indicated that the multivariate linear regression replicate the trip generation patterns better than univariate linear-regression. Overall, this study suggests the use of multivariate linear regression models for estimating trip generation models as a substitute for the traditional univariate linear-regression models.
Trip Generation, Regression, Zone, Transportation Planning, Model
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Research Articles
Development Of Pavement Condition State Model To Design Pavement Maintenance Management System By Using Non Linear Regression Analysis
Surendrakumar Katkar and Prashant Nagrale
The analysis procedure adopted in this study is to get condition state of a particular pavement from its maintenance cost. As the relationship between the cost of repair corresponding to the condition state of a pavement, is non linear, for intermediate maintenance cost, it is not possible to linearly interpolate it to get the condition state of that pavement. In this research, maintenance treatment and its corresponding cost is correlated to quantify condition state of pavement by using non linear regression analysis. The research is useful to identify the deterioration process and its severity with respect to time which will guide to decide the cost effective maintenance policy and the right time of doing it well before pavement needs rehabilitation.
Regression Analysis, Pavement Maintenance Management System (PMMS)
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Research Articles
A Study On Evaluation Of Warm Mix Asphalt Using The Admixture Sasobit
Siddhartha Rokade, Yusuf Sultan and Sherin Felix
With the expanding economic activities the structure of the atmosphere has started to rapidly change. The climate warming is also caused due to the increasing carbon dioxide content in the atmosphere. To reduce the emissions from CO2 gas liberated in the atmosphere, the Supreme Court in India has banned the use of Hot Mix Plants (HMP) in metropolitan cities like Delhi. In this context the Warm Mix Asphalt (WMA) technology is very useful. In Europe and the United States, a number of similar technologies have been developed in recent years. The main objective of the WMA technology is reduction of asphalt binder viscosity within the limits of certain temperature. Thus, a lower viscosity allows the full coating of aggregates with bitumen at a lower temperature than needed for mixing the Hot Mix Asphalt (HMA) mixtures. Thus, WMA mixes save money in the plant through reduced energy costs. The warm mixes allow construction of pavements in colder weather, because critical loss of temperature in the cold will be less, resulting in longer construction season extending into the winter.
The present study was carried out in the laboratory to evaluate the suitability of the admixture Sasobit in WMA applications. The assessment of strength characteristics of WMA using Sasobit is presented in this study. Further, the optimum content of Sasobit in Warm Mix asphalt is determined. Also, an analysis is carried out on the effect of variation of mixing temperature on the properties of WMA.
Hot Mix Asphalt (HMA); Warm Mix Asphalt (WMA); Voids filled with bitumen (VFB); Voids in Mineral Aggregates (VMA); Sasobit, Marshal Stability Test
Research & Publications Department 