TY - JOUR
T1 - Influence of specimen size on engineering properties of macroporous rock-like materials
AU - Morrison, Sara
AU - Hudyma, Nick
AU - Erfourth, Bethany
AU - MacLaughlin, Mary
PY - 2007
Y1 - 2007
N2 - Macroporous rock, such as lithophysal tuff and vesicular basalt, has long exasperated the engineering community due to its inability to be neatly characterized. Such rock can have extreme variability in the size, shape, distribution, and density of the voids which in turn causes great deviation in its engineering properties. Given the variability of the void size and shape, the proper specimen size can be difficult to distinguish. ASTM standards dictate the specimen diameter must be three times the nominal maximum size of voids or aggregate, calculating the nominal maximum size of macropores is not feasible. To simplify the characterization of the impact of specimen size, analog plaster models containing Styrofoam spheres of one-inch diameter were tested. Specimens are right cylinders with diameters of 5.08 cm, 7.62 cm, and 10.16 cm with 2:1 aspect ratios. All three specimen sizes were able to effectively capture trends in unconfined compressive strength and Young's modulus over a range of porosities, though the regression types differ. Only the 7.62 cm and 10.16 cm diameter specimens produced valid trends in the Young's modulus at various porosities, although as mentioned, the regressions are different. Copyright ASCE 2007.
AB - Macroporous rock, such as lithophysal tuff and vesicular basalt, has long exasperated the engineering community due to its inability to be neatly characterized. Such rock can have extreme variability in the size, shape, distribution, and density of the voids which in turn causes great deviation in its engineering properties. Given the variability of the void size and shape, the proper specimen size can be difficult to distinguish. ASTM standards dictate the specimen diameter must be three times the nominal maximum size of voids or aggregate, calculating the nominal maximum size of macropores is not feasible. To simplify the characterization of the impact of specimen size, analog plaster models containing Styrofoam spheres of one-inch diameter were tested. Specimens are right cylinders with diameters of 5.08 cm, 7.62 cm, and 10.16 cm with 2:1 aspect ratios. All three specimen sizes were able to effectively capture trends in unconfined compressive strength and Young's modulus over a range of porosities, though the regression types differ. Only the 7.62 cm and 10.16 cm diameter specimens produced valid trends in the Young's modulus at various porosities, although as mentioned, the regressions are different. Copyright ASCE 2007.
UR - http://www.scopus.com/inward/record.url?scp=34548580794&partnerID=8YFLogxK
U2 - 10.1061/40906(225)11
DO - 10.1061/40906(225)11
M3 - Conference article
AN - SCOPUS:34548580794
SN - 0895-0563
SP - 11
JO - Geotechnical Special Publication
JF - Geotechnical Special Publication
IS - 162
T2 - Geo-Denver 2007: New Peaks in Geotechnics
Y2 - 18 February 2007 through 21 February 2007
ER -