| Author: | Ying, Kai-chi |
| Title: | Simulation of ready mixed concrete delivery from a single plant to mutiple construction sites |
| Degree: | M.Phil. |
| Year: | 2004 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Ready-mixed concrete -- Transportation Ready mixed concrete industry -- Automation |
| Department: | Department of Civil and Structural Engineering |
| Pages: | xiv, 118, [262] leaves : ill. (some col.) ; 30 cm |
| Language: | English |
| Abstract: | A simulation program RMCSIM has been developed in this project using Visual Basic combined with a Microsoft Access database system and other Microsoft tools. It simulates a concrete plant with N mixing bays, M TMs (truckmixers) serving S sites, where sites are at variable distances D from the plant and different concrete quantities Q are required by each site on which different placing methods are used. N, M, S, D, Q and placing methods are the variables which can be input by the user. RMCSIM has been used to simulate many different situations for a batching plant as explained below. Three simulated operation days were selected which represent three different concrete quantity demands (large, medium and small) in total from sites. 450 simulations were run, 150 for each case (day). In order to assess the scale of the mismatch problem, a questionnaire survey was conducted in the first quarter of 2003 to ask for the opinions of concrete professionals in Hong Kong and 51 respondents provided useful information. To achieve a better matching of deliveries between concrete plant and sites, it is suggested that (1) the time interval required between successive TMs should be adjusted to take account of the different placing method for each pour and (2) the account should be taken of 'miscellaneous waiting time' on site. After adjusting (1) and (2) and rerunning RMCSIM, a great improvement was observed in the "Time waiting for TM arrival (% of pour time)", a measure of the interruption in concrete supply to the sites. This measure could be reduced by about 40%. |
| Rights: | All rights reserved |
| Access: | open access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b17811429.pdf | For All Users | 47.72 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/3890