| Laboratory Test Sheet |
| Compressive Strength of Concrete Cores |
| Client : Site : |
| Client Ref : Lab. Ref : Job No : Date Received : |
| Supplier : Source : |
| Material Type : Specification : |
| Material Name : Stone Type : |
| Type of Rig ..................................................................... Operator ........................................................ Location of Core ................................................. |
| Photograph (tick) Core ................................... Hole .................................... Date Sampled ........................... Date Tested ........................... |
| Adjusted compressive strength (C = AxB) |
| Estimated in situ Cube Strength (MN/m2) |
| Adjusted estimated cube strength for reinforcement (MN/m2) |
| CALCULATION OF ESTIMATED CUBE STRENGTH |
| Estimated Cube Strength = D / (1.5 + (1/a)) x Measured Compressive Strength of Core where D = 2.5 (Horizontal Cores) D = 2.3 (Vertical Cores) a = L/D (after end preparation) |
| REINFORCED ADJUSTMENT Adjusted Estimated Cube Strength = Estimated Cube Strength x Factor |
| Factor (a) for Cores containingsinglt bar = 1.0 + 1.5 ((Ør d) / (Øc l)) |
| (b) for Cores containing two bars no further apart than the diameter for the larger bar, only the bar corresponding to the higher value of Ø.r d |
| need be considered. If the bars are further apart, their combined effect should be assessed using the factor = 1.0 + 1.5 ((Ør d) / (Øc |
| l = length of uncapped core, where, Ør = diam. of reiforcement; Øc = diam. of core; d = distance of axis bar from nearer end of core |
| FACTORS FOR EXCESS VOIDAGE CHECK LIST |
| Excess Voidage % Strength Multiplying Factor |
| 0 1.00 Diameter 150mm 100mm |
| 0.5 1.04 |
| 1.0 1.08 Diameter: Aggregate > 3 : 1 < 3 : 1 |
| 1.5 1.13 Size Ratio |
| 2.0 1.18 Length: Diameter 1 - 2 Other |
| 2.5 1.23 Ratio |
| 3.0 1.28 Calibration Check |
| 3.5 1.33 |
| 4.0 1.39 End Capping Inspection: |
| 4.5 1.45 |
| 5.0 1.51 Shrinkage Y/N Cracks Y/N Voids Y/N |
| Direction of drilling (tick box) Method of flush (tick box) Dia. of drill bit |
| Vertical up Approx Angle Water flush |
| Vertical down + a Air flush |
| Horizontal - a Dry |
| Inclined Antifreeze |
| Depth of carbonation Number of Pieces Reinforcement size |
| Max Min Distance to reinforcement |
| Assembled Max Condition |
| length Min Vertical or horizontal |
| Operators comments on CORE SAMPLE (condition of concrete and steel, cracks, delamination) Sketch of core hole locatio |
| Operators comments on CORE HOLE (cracks, voids, poor compaction, reiforcement, loss of wat |
| Notes: 1. Mark core with site reference no. 4. If outside of core is destroyed by coring, mark core with estimate of depth of new surface |
| 2. All core locations to be photographed or sketcked 5. Samples to be dried, wrapped in cling film and sealed in polythene bag. |
| 3. All cores to be labelled |
| Lab. Sample Number. |
| Orientation horiz/vertical |
| Site curing conditions |
| Date drilled/received |
| Condition on receipt |
| Date cast |
| Date Tested |
| Age at last |
| Laboratory curing Date/Time In |
| < 48 hours Date/Time Out |
| Max Length as received (mm) |
| Min Length as received (mm) |
| Wt in air (g) BS 1881 Part 114 |
| Wt in water (g) BS 1881 Part 114 |
| Density by displacement (kg/m3) |
| Excess voidage by inspection (%) |
| Excess voidage by density (%) |
| Average excess voidage (%) |
| Factor for excess voidage (B) |
| Length after trimming (mm) |
| Length after capping (mm) |
| Average Diameter (mm) |
| Length/Diameter ratio (after capping) |
| Capping Material |
| Reiuforcement (diam) (mm) |
| Load at Failure (kN) |
| Compressive Strength (MN/m2) (A) |
| Strength of Mortar Cube |
| Tested By : Date : Checked By : Date : |