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 : |