Schmidt Rebound Hammer Test Correlation Curve for Concrete Produced Using Aggregates in & around Addis Ababa
| dc.contributor.advisor | Senbetta, Ephraim (PhD) | |
| dc.contributor.author | Assefa, Gashaw | |
| dc.date.accessioned | 2018-07-03T06:27:46Z | |
| dc.date.accessioned | 2023-11-11T08:29:14Z | |
| dc.date.available | 2018-07-03T06:27:46Z | |
| dc.date.available | 2023-11-11T08:29:14Z | |
| dc.date.issued | 2016-12 | |
| dc.description.abstract | Among the available non-destructive test methods in concrete testing, the Schmidt hammer test is the most commonly used one in practice. It has been used world-wide as an index test to estimate strength of concrete due to its rapidity and easiness in execution, simplicity, portability, low cost and non-destructiveness. The rebound hammer was constructed and tested extensively at the Swiss Federal Materials Testing and Experimental Institute in Zurich. A correlation was developed between the compressive strength of standard cubes and the rebound number, and this correlation is provided with the instrument. However, as other investigators began to develop correlations between strength and rebound number, it became evident that there was no unique relationship between strength and rebound number. The main focus of this research is to produce a correlation curve of Schmidt hammer for concretes produced by using aggregates in and around Addis Ababa. The rebound hammer test with the strength correlation curve can be used to estimate concrete strength during construction so that operations that require a specific strength like formwork removal and posttensioning can be performed safely and curing procedures can be terminated. It can also be used to estimate concrete strength during the evaluation of existing structures. Based on the literature review, the aggregates in the study area were classified. Strength levels, number of replications and the number of Rebound hammer tests at each strength level were determined. After determination of the aggregate classes, strength level and number of replicate, mix design was prepared for two aggregate types based on the ACI method. In accordance with the mix design, samples were casted on 15 cm cube for all strength levels and for the two aggregate types. After conducting laboratory work and analyzing the data, two correlation curves were generated for concretes produced using aggregates from Bole Lemi and Sululta area with a function of y = 0.1894x1.6031 and y = 0.103x1.8224 respectively. Comparison between the curve provided along with Schmidt rebound hammer and generated curve was made and for a same compressive strength of a concrete, the generated correlation curve provides a lower rebound number. Keyword: Non-destructive test, Correlation curves, Schmidt rebound hammer, compressive strength | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/5609 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Non-destructive test | en_US |
| dc.subject | Correlation curves | en_US |
| dc.subject | Schmidt rebound hammer | en_US |
| dc.subject | Compressive strength | en_US |
| dc.title | Schmidt Rebound Hammer Test Correlation Curve for Concrete Produced Using Aggregates in & around Addis Ababa | en_US |
| dc.type | Thesis | en_US |