Abstract
Geotextiles may be bonded to concrete by placing fresh concrete directly on a geotextile. A laboratory test program was developed to determine the influence of construction, characteristics of the geotextile, concrete, and load on the bond strength between concrete and geotextiles. Tests were conducted by casting 75 mm thick concrete blocks on top of a geotextile, allowing the concrete to cure, and then measuring the force required to peel the geotextile away from the concrete blocks. Results from over 120 tests on 16 different nonwoven and woven geotextiles indicate that bond strength is controlled significantly by details of the geotextile and construction details. The bond strength of nonwoven geotextiles was influenced significantly by the average distance between individual fibers within the geotextile, that is, the larger the distance between fibers, the more readily concrete can flow between fibers, anchor them in concrete, and thus provide bond. After placing the fresh concrete, vibration caused the bond strength to increase about 20% by allowing the cement to flow more readily around the fibers. Woven geotextiles bonded poorly with concrete unless geometric projections were provided. Woven geotextiles with projections bonded well with concrete but were sensitive to the direction in which load was applied.
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