Abstract
A comprehensive study on the use of the Windsor probe system to assess in situ strength of concrete is reported. The tests were carried out on slabs of normal weight and light-weight concrete, having a strength of 5-70 n/sq.mm up to about a year. The effect of aggregate type and aggregate size was also investigated. The results were related to pulse velocity, internal fracture and core tests. If the Windsor probe system is used to evaluate absolute values of in situ strength, separate calibration charts are necessary to account for type of concrete, size of aggregate, aggregate type and age. As a general method of non-destructive testing, the probe system estimated strength up to 28 days better than small diameter cores, while the latter estimated strength of old concrete better. In particular, the probe system appeared unable to identify low strength at one year. (Author/TRRL)
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