The Effect of Specimen Size on Strength and Other Properties in Laboratory Testing of Rock and Rock-Like Cementitious Brittle Materials |
| |
Authors: | Email author" target="_blank">William?J?DarlingtonEmail author Pathegama?G?Ranjith S?K?Choi |
| |
Institution: | (1) Department of Civil Engineering, Monash University, Clayton, VIC, Australia;(2) CSIRO Earth Science and Resource Engineering, Bayview Avenue, Clayton, VIC, Australia |
| |
Abstract: | The effect of specimen size on the measured unconfined compressive strength and other mechanical properties has been studied
by numerous researchers in the past, although much of this work has been based on specimens of non-standard dimensions and
shapes, and over a limited size range. A review of the published literature was completed concentrating on the presentation
of research pertaining to right cylindrical specimens with height:diameter ratios of 2:1. Additionally, new data has been
presented considering high strength (70 MPa) cement mortar specimens of various diameters ranging from 63 to 300 mm which
were tested to failure. Currently, several models exist in the published literature that seek to predict the strength–size
relationship in rock or cementitious materials. Modelling the reviewed datasets, statistical analysis was used to help establish
which of these models best represents the empirical evidence. The findings presented here suggest that over the range of specimen
sizes explored, the MFSL (Carpinteri et al. in Mater Struct 28:311–317, 1995) model most closely predicts the strength–size relationship in rock and cementitious materials, and that a majority of the
empirical evidence supports an asymptotic value in strength at large specimen diameters. Furthermore, the MFSL relationship
is not only able to model monotonically decreasing strength–size relationships but is also equally applicable to monotonically
increasing relationships, which although shown to be rare do for example exist in rocks with fractal distributions of hard
particles. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|