ISSN: 0149-6123
CODEN: CCAGPD
Page Count: 2

An Experiment to Investigate Chloride Intrusion on Construction Joints in Concrete
Buck, AD
Geologist, U.S. Army Engineer Waterways Experiment Station, Structures Laboratory, MS

Denes, T
Civil engineer, U.S. Army Engineer District, CA

Abstract

A field experiment was conducted to investigate the extent of chloride intrusion along the construction joint between later-placed, cement-based grout and concrete in instrumented precast concrete breakwater elements (dolosse). Experimental blocks were cast, grouted, and submerged in seawater. Upon retrieval, the construction joint between the grout and the concrete was evaluated for chloride intrusion from seawater using X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDX) of scanning electron microscope (SEM) samples. No detectable intrusion occurred, indicating that the planned instrumentation of dolosse in a field experiment should be secure from significant seawater intrusion.

Keywords:
chloride intrusion, dolosse, grout, concrete, X-ray diffraction, energy dispersive, X-ray analysis, scanning electron microscopy

Paper ID: CCA10072J
DOI: 10.1520/CCA10072J
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