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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 40 Abstracts search results
Document:
CI4604Britt_spotlight
Date:
April 1, 2024
Author(s):
Jennifer Britt
Publication:
Concrete International
Volume:
46
Issue:
4
Abstract:
Existing concrete slabs and structures require scanning and imaging before any build out, renovation, or excavation work begins. Ground-penetrating radar technology has established itself as the primary tool for fast, effective, and efficient determination of the presence of utilities and embedded structural members, such as post-tensioning tendons and reinforcing bars.
SP-343_19
October 1, 2020
Conforti, A.; Trabucchi, I.; Tiberti, G.; Plizzari, G.A.; Caratelli, A; Meda, A.; Moro, S.; Hunger, M.
Symposium Papers
343
There is a growing interest in the scientific community on the structural applicability of polypropylene macrofibers without or in combination with conventional reinforcement as spread reinforcement for precast tunnel segmental linings. Polypropylene macrofibers could be used in precast tunnel segments as shear reinforcement and for withstanding splitting and spalling tensile stresses which occur under and between Tunnel Boring Machine (TBM) rams, respectively. Fibers could also simplify and speed up the tunnel element production process. In this context, the present study investigates the possibility of using polypropylene macrofiber reinforcement in precast tunnel segments for both hydraulic and metro tunnel linings. Four full-scale segments (two counter-key segments of a hydraulic tunnel and two trapezoidal shaped segments of a metro tunnel) were experimentally evaluated under point load test. The latter simulate the TBM actions on segments during the excavation process (TBM thrust jack phase), which is generally the most critical temporary loading condition for segments. Two reinforcement solutions were studied: a typical conventional reinforcement (reference samples) and a combination of polypropylene macrofibers and conventional reinforcement (hybrid solution). Polypropylene macrofibers were observed to be very effective in combination with conventional reinforcement, underlining the fibers ability in controlling both splitting and spalling phenomena.
CI4006Granosik
June 1, 2018
Tadeusz Granosik and Guy Michel Chovelon
40
6
An alternative method for construction of pile caps on single, bored cast-in-place piles is proposed. The method allows a single subcontractor to install both the pile and the pile cap, thereby saving time by eliminating the need for separate excavation, construction, and backfilling operations to complete the pile cap.
CI3103CRSIStaff
March 1, 2009
CRSI Staff
31
3
Generally, it’s most economical to place wall footings at a constant elevation. If the site or finished grade slopes along the length of the wall, however, the footing may end up a considerable distance below finished grade. This is clearly not economical, as it requires extra excavation and material. Factors affecting the decision to slope the footing with the site so its depth below finished grade is nearly constant or to step the footing so its depth below finished grade is not excessive at any point along its length are presented.
CI2804Boehle
April 1, 2006
Bill Boehle, Megan Hart
28
The Getty Villa in Pacific Palisades, CA, recently reopened after an extensive 5-year renovation. A unique concrete “strata wall” resembling the sides of an excavation formed the basis for the design of a series of outdoor plazas and indoor spaces. The challenging task presented by the number of different concrete mixtures, surface textures, and decorative aggregates contained in the wall and surrounding decorative concrete slabs are discussed in this article.
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