DFI Magazine September/October 2020 - 95

Test pile construction: (a) Sonotube installation over instrumented rebar cage (b) piles before pouring concrete (c) completed
reinforced concrete piles with caps

The stratigraphy and test geometry were
chosen to intentionally exaggerate the shear
amplification effect, and to experimentally
discern any distinctive failure mechanisms
between the three pile specimens.
Specimen Construction - After
extensively instrumenting of the rebar
cages before adding them to the soil pit, the
cages were placed inside Sonotubes and
positioned next to a soil pit wall to
maintain verticality and provide support.
Concrete was poured and manually
vibrated to avoid sensor damage. The same
concrete mix design was used for all three
specimens and had a 28-day specified
compressive strength of 27.58 N/mm2
(4 ksi). The specimens had as-built
compressive strengths (i.e., cylinder
strengths) of 40.7, 39.3, and 39.3 MPa
(5.9, 5.7, and 5.7 ksi), respectively, on the
day of pile testing.
The piles were then placed and secured
inside the rock-socket formwork and
socket concrete was poured. Rock was
simulated by using high-strength concrete
with a 28-day specified compressive
strength of 34.5 MPa (5 ksi), which yielded
an average as-built strength of 48.3 MPa
(7 ksi) on the day of pile testing. After
curing, the rock sockets were connected to
the strong floor via vertical epoxy-grouted

Cured pile-socket specimens that will have geofoam installed around rock sockets
Pluviation of fill sand



DFI Magazine September/October 2020

Table of Contents for the Digital Edition of DFI Magazine September/October 2020

CONTENTS
CONTENTS 2
DFI Magazine September/October 2020 - Intro
DFI Magazine September/October 2020 - 1
DFI Magazine September/October 2020 - 2
DFI Magazine September/October 2020 - CONTENTS
DFI Magazine September/October 2020 - 4
DFI Magazine September/October 2020 - CONTENTS 2
DFI Magazine September/October 2020 - 6
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