Pullout Resistance of Reinforcement of Lightweight Cellular Concrete Fill [Technical Summary]

Abstract

This report presents a series of laboratory tests to evaluate the material properties of LCC and the pullout resistances of geogrid and steel strip in LCC specimens cast in the field. Based on the test results, the following conclusions can be drawn: The average wet densities of LCC ranged from 30 to 36 pcf at the age of 28 days and the average dry densities ranged from 21 to 24 pcf at the same age. The dry density was approximately 67% of the wet density. The density increased as the cement to fly ash ratio increased. All LCC specimens used in this study are considered ultra-low density cellular concrete. The permeability values for LCC measured using the falling head method ranged from 2.1 710-5 to 3.0 710-4 in./s, respectively. In general, the permeability decreased as the hydraulic gradient and the confining stress increased. For the small shear box tests, the cohesion values of the LCC specimens ranged from 19 to 37 psi, while their frictional angles ranged from 19 to 63 degrees. For the large shear box tests, the cohesion values of the LCC specimens ranged from 33 to 50 psi, while their frictional angles ranged from 23 to 79 degrees. The large shear box tests measured higher shear strengths than the small shear box tests