Effects of Pumice as a Partial Replacement on the Performance of Pervious Cement Concrete
| dc.contributor.advisor | Esayas, Gebreyouhannes (PhD) | |
| dc.contributor.author | Abel, Wube | |
| dc.date.accessioned | 2020-02-08T08:53:48Z | |
| dc.date.accessioned | 2023-11-11T12:53:33Z | |
| dc.date.available | 2020-02-08T08:53:48Z | |
| dc.date.available | 2023-11-11T12:53:33Z | |
| dc.date.issued | 2019-12-02 | |
| dc.description.abstract | Pervious cement concrete pavement is an innovative pavement system, which have the ability to drain water and absorb traffic noise generated by tyre-pavement interaction. Its use in parking lots, walkways and low traffic zone pavements has been promising in the past. The main feature that differentiates pervious cement concrete from any other mixes is, its large interconnected pores measuring up to 35% of the total volume of concrete. Despite the effectiveness of these large interconnected pores to drain water and absorb noise, their negative effect on strength is significant. Therefore strength and permeability are of special properties that need to be balanced. Whether conventional dense graded concrete or pervious concrete, the structure of the aggregate to cement matrix remains the same i.e. aggregate, hardened cement paste (hcp) and interfacial transition zone (ITZ) are the main components. ITZ is the weakest in the solid system of pervious concrete and is a region where crack initiation and propagation occur with less energy. Therefore, a mechanism to increase the strength of ITZ i.e. which can be taken as the whole concrete system shall be devised. Little research has been conducted that characterizes the performance of grounded pumice (GP) on pervious concrete. In this research, the performance of GP as OPC replacement is investigated. The characterizations are done using compressive, splitting tensile strength, permeability, hardened density and porosity tests. The experiment is designed by preparing control mix containing 100% OPC and the experimental mix that contains 5%, 10%, 15%, 20%, 25% and 30% GP. Tests are conducted at the ages of 3,7,28 and 56 days. Based on the experimental investigations, GP has resulted an increase in compressive and splitting tensile strength up to 11% and 26%, respectively. It is also found that, GP can partially replace OPC up to 15%. The optimum replacement level both for strength and permeability is found to be 5%. The ideal porosity that reconciles hydraulic conductivity and strength is found to be 17%. The high water demand by addition of GP has also been mitigated by proposing consistency driven water demand for pervious concrete mixes containing GP. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/20573 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Consistency Driven Water Demand | en_US |
| dc.subject | Grounded Pumice | en_US |
| dc.subject | hcp | en_US |
| dc.subject | Hydraulic Conductivity | en_US |
| dc.subject | ITZ | en_US |
| dc.subject | Pavement | en_US |
| dc.subject | Pervious Concrete | en_US |
| dc.subject | Pozzolanic Materials | en_US |
| dc.title | Effects of Pumice as a Partial Replacement on the Performance of Pervious Cement Concrete | en_US |
| dc.type | Thesis | en_US |