ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 03 NO. 03 JULY 2014: 

Title:        Effect of induced vibration on fresh concrete
Authors:   Rezoana Islam, Mir Abdul kuddus, Shaolin Ferdousi, Tabassum Mohsin
Abstract:  Concrete is an artificial kind of stone prepared from an indefinite mixture of three basic components such as binding materials, inert materials and water. When the components are mixed together to prepare concrete, binding materials such as cement paste acts as a glue binding surrounding the inert materials during the process of hydration and curing. The freshly mixed concrete becomes hard with considerable strength following the setting procedure of cement. During the setting period, vibration may come on fresh concrete as a result of earthquake, pile driving, heavy traffic or vibratory soil compactors. The objective of this research was to perform a laboratory test to find out the effect of vibration on working strength of concrete between the initial and final setting period. On this purpose, two different sizes concrete cylinders (4”X8” and 6”X12”) were casted by mixing cement, sand, stone chips and water with two ratios (1:2:4 and 1:1.5:3). Water-cement ratio was 0.78.The initial and final setting time were recorded as 140min and 270 min respectively. The concrete cylinders were then subjected to two level of vibration for 1 min or 2 min at three different ages (2 hr, 3.5 hr and 5 hr) by the help of shaking table. The peak particle velocities were 50mm/s -100mm/s, 150mm/s and 200mm/s-300mm/s. About 96 cylinders were tested for compression and splitting tensile strength tests at 7 days and 28 days. From the test results it was found that, the compressive strength was increased up to 20% and the tensile strength was decreased up to 13% over the controlled cylinder specimen by the effect of vibration.

Keywords:   Fresh Concrete, Setting time, Vibration, Compressive Strength, Tensile Strength
Page no:     256-260

Download Full Paper