Proceq Pundit PL-200 UPV

TRSC deploys the Pundit PL-200 on every condition assessment that requires verification of concrete homogeneity or estimation of in-situ strength without the disruption and cost of full coring. The most common application is comparison-mode UPV across a structural element to identify zones of reduced velocity that suggest internal voids, honeycombing, delamination or cracking — three fast UPV transects across a slab will localise problem zones for follow-up GPR or impact-echo investigation, often eliminating the need for blanket coring. Quantitative compressive-strength estimation requires calibration against extracted cores from the same structure, since the velocity-strength correlation varies materially with aggregate type, mix design, age and moisture. TRSC presents UPV-derived strength estimates as ranges with explicit calibration documentation rather than as single absolute values. Operational notes: indirect (single-face) UPV is significantly less reliable than direct (through-element) UPV and is reserved for elements where back-face access is impossible; couplant selection (gel vs grease) affects transit-time consistency; surface roughness on weathered facades introduces variance that must be mitigated by surface preparation before the survey. Recent deployment: 140 William Street facade UPV survey paired with chloride profiling, and 12 Creek Street facade investigation where Pundit transects identified local delamination zones within an otherwise sound facade. The PL-200 also supports cross-hole UPV via tomography for crack-depth estimation in semi-direct mode, although TRSC reserves this technique for situations where impact-echo and visual borescope inspection are insufficient to characterise an internal feature — in most field investigations the simpler direct-mode pulse-velocity transect produces the diagnostic information required at significantly lower setup cost.