Light Weight Deflectometer (LWD) Correlation Trial Report
Executive summary
The Light Weight Deflectometer (LWD) is a portable device that plays an important role in checking and measuring the stiffness of highway foundations. It is also used to control the quality of base installations for sports facilities, such as football pitches and athletic tracks. National Highways and Transport Scotland commissioned WSP, in partnership with AECOM, to assess the performance of LWD devices used in the UK against the recognised standard device, known as the Falling Weight Deflectometer (FWD).
The fourth annual UK LWD correlation trial took place over a four-day period in the week commencing 8 September 2025. The test site for the correlation trial was located within AECOM’s Pavement Test Facility (PTF) based in Nottingham. Machines and operators from 91 organisations attended the correlation trial. In total, 183 LWD devices were compared against a pre-calibrated FWD.
Trial operatives followed Procedure A, as outlined in Clause 885 (MCHW1). The procedure involved applying three seating drops from the 100 kPa test height of the LWD, followed by three further drops of which the mean is reported as the surface modulus value. The trial involved measuring surface modulus values at 30 measurement points with both the LWD and FWD.
Approved Devices
|
LWD ID |
Device Manufacturer |
Serial Number |
Operating Company |
|
LWD 2025 001 |
Dynatest |
3032-3382 |
Chasetown Civil Engineering Ltd |
|
LWD 2025 002 |
Dynatest |
3032-3205 |
Kiwa CMT |
|
LWD 2025 003 |
Dynatest |
3032-3292 |
Norfolk Partnership Laboratory |
|
LWD 2025 004 |
Dynatest |
3032-3041 |
Norfolk Partnership Laboratory |
|
LWD 2025 005 |
Dynatest |
3032-3166 |
Norfolk Partnership Laboratory |
|
LWD 2025 006 |
Dynatest |
3032--3257 |
Breedon East Kilbride Laboratory |
|
LWD 2025 007 |
Dynatest |
3032-3204 |
Pavement Management Services Ltd |
|
LWD 2025 008 |
SWECO |
2310030 |
Construction Testing Solutions Ltd |
|
LWD 2025 009 |
Dynatest |
3032-3269 |
Construction Testing Solutions Ltd |
|
LWD 2025 010 |
Dynatest |
3032-3049 |
Norfolk Partnership Laboratory |
|
LWD 2025 011 |
Dynatest |
3032-3259 |
Construction Testing Solutions Ltd |
|
LWD 2025 012 |
Dynatest |
3032-3368 |
Oema Ltd |
|
LWD 2025 013 |
Dynatest |
3032-3380 |
i2 Analytical Ltd |
|
LWD 2025 014 |
Dynatest |
3032-3126 |
i2 Analytical Ltd |
|
LWD 2025 015 |
Dynatest |
3032-3356 |
i2 Analytical Ltd |
|
LWD 2025 016 |
Dynatest |
3032-3377 |
i2 Analytical Ltd |
|
LWD 2025 017 |
Dynatest |
3032-3376 |
i2 Analytical Ltd |
|
LWD 2025 018 |
Dynatest |
3032-3273 |
i2 Analytical Ltd |
|
LWD 2025 019 |
Dynatest |
3032-3378 |
Symbiotic Solutions Ltd |
|
LWD 2025 020 |
Dynatest |
3032-3288 |
Dynatest |
|
LWD 2025 021 |
Dynatest |
3032-3351 |
i2 Analytical Ltd |
|
LWD 2025 022 |
Dynatest |
3032-3184 |
Construction Testing Solutions Ltd |
|
LWD 2025 023 |
Dynatest |
3032-3431 |
Holcim |
|
LWD 2025 024 |
Dynatest |
3032-3206 |
JMS Contractors Ltd |
|
LWD 2025 025 |
Dynatest |
3032-3267 |
IGNE Ltd |
|
LWD 2025 026 |
Dynatest |
3032-3371 |
IGNE Ltd |
|
LWD 2025 027 |
Dynatest |
3032-3260 |
IGNE Ltd |
|
LWD 2025 028 |
Dynatest |
3032-3379 |
i2 Analytical Ltd |
|
LWD 2025 029 |
Dynatest |
3032-3183 |
Costain |
|
LWD 2025 030 |
Dynatest |
3032-3143 |
Gary Lambert Construction Ltd |
|
LWD 2025 031 |
Dynatest |
3032-3301 |
ACS Testing Ltd |
|
LWD 2025 032 |
Dynatest |
3032-3374 |
ACS Testing Ltd |
|
LWD 2025 033 |
Dynatest |
3032-3383 |
IGNE Ltd |
|
LWD 2025 034 |
Dynatest |
3032-3155 |
BAM Ritchies |
|
LWD 2025 035 |
Dynatest |
3032-3226 |
ACS Testing Ltd |
|
LWD 2025 036 |
Dynatest |
3032-3235 |
BAM Ritchies |
|
LWD 2025 037 |
Dynatest |
3032-3429 |
Lancashire County Council |
|
LWD 2025 038 |
Dynatest |
3032-3434 |
Eurotest Ltd |
|
LWD 2025 039 |
Dynatest |
3032-3401 |
Construction Testing Solutions Ltd |
|
LWD 2025 040 |
Dynatest |
3032-3422 |
Construction Testing Solutions Ltd |
|
LWD 2025 041 |
Dynatest |
3032-3180 |
Construction Testing Solutions Ltd |
|
LWD 2025 042 |
Dynatest |
3032-3246 |
Construction Testing Solutions Ltd |
|
LWD 2025 043 |
SWECO |
2102005 |
Construction Testing Solutions Ltd |
|
LWD 2025 044 |
Dynatest |
3032-3029 |
AECOM |
|
LWD 2025 045 |
SWECO |
1812001 |
Construction Testing Solutions Ltd |
|
LWD 2025 046 |
Dynatest |
3032-3426 |
Murray Rix (Northern) Ltd |
|
LWD 2025 047 |
Dynatest |
3032-3425 |
Spectest UK Ltd |
|
LWD 2025 048 |
Dynatest |
3032-3424 |
Construction Testing Solutions Ltd |
|
LWD 2025 049 |
Dynatest |
3032-3253 |
Construction Testing Solutions Ltd |
|
LWD 2025 050 |
Dynatest |
3032-3164 |
Amtest Ltd |
|
LWD 2025 051 |
Dynatest |
3032-3132 |
SPL Ltd |
|
LWD 2025 052 |
Dynatest |
3032-3237 |
BAM Ritchies |
|
LWD 2025 053 |
Dynatest |
3032-3430 |
J D C Civils Ltd |
|
LWD 2025 054 |
Dynatest |
3032-3129 |
BAM Ritchies |
|
LWD 2025 055 |
Dynatest |
3032-3432 |
GSTL |
|
LWD 2025 056 |
Dynatest |
3032-3186 |
G & H Technical Services Ltd |
|
LWD 2025 057 |
Dynatest |
3032-3280 |
Hampshire CC Highways Laboratory |
|
LWD 2025 058 |
Dynatest |
3032-3310 |
SPL Ltd |
|
LWD 2025 059 |
Dynatest |
3032-3417 |
BAM Ritchies |
|
LWD 2025 060 |
Dynatest |
3032-3294 |
BAM Ritchies |
|
LWD 2025 061 |
Dynatest |
3032-3272 |
Trojan Construction Testing Services Ltd |
|
LWD 2025 062 |
Dynatest |
3032-3306 |
G & H Technical Services Ltd |
|
LWD 2025 063 |
SWECO |
2210008 |
CJ Associates Geotechnical Ltd |
|
LWD 2025 064 |
Dynatest |
3032-3369 |
Sunbelt Rentals Ltd |
|
LWD 2025 065 |
Dynatest |
3032-3187 |
DMH Testing Ltd |
|
LWD 2025 066 |
Dynatest |
3032-3333 |
VolkerFitzPatrick |
|
LWD 2025 067 |
Dynatest |
3032-3264 |
Dynatest |
|
LWD 2025 068 |
Dynatest |
3032-3282 |
Structural Soils Ltd |
|
LWD 2025 069 |
Dynatest |
3032-3215 |
BAM Ritchies |
|
LWD 2025 070 |
Dynatest |
3032-3331 |
PJB Technical Services Ltd |
|
LWD 2025 071 |
Dynatest |
3032-3375 |
Hampshire CC Highways Laboratory |
|
LWD 2025 072 |
Dynatest |
3032-3370 |
Sunbelt Rentals Ltd |
|
LWD 2025 073 |
Dynatest |
3032-3374 |
Northumberland CC |
|
LWD 2025 074 |
Dynatest |
3032-3381 |
GallifordTry |
|
LWD 2025 075 |
Dynatest |
3032-3142 |
Structural Soils Ltd |
|
LWD 2025 076 |
Dynatest |
3032-3287 |
M & H Testing Ltd |
|
LWD 2025 077 |
Dynatest |
3032-3156 |
Day Aggregates Ltd |
|
LWD 2025 078 |
Dynatest |
3032-3433 |
IGNE Ltd |
|
LWD 2025 080 |
Dynatest |
3032-3402 |
The Sirius Group |
|
LWD 2025 081 |
Dynatest |
3032-3367 |
Evolve Geo-Environmental Ltd |
|
LWD 2025 082 |
Dynatest |
3032-3359 |
Devon CC |
|
LWD 2025 083 |
Dynatest |
3032-3268 |
MA2 Testing Ltd |
|
LWD 2025 084 |
Dynatest |
3032-3248 |
E Terry Groundworks Ltd |
|
LWD 2025 085 |
Dynatest |
3032-3385 |
Jackson Geo Services Ltd |
|
LWD 2025 086 |
Dynatest |
3032-3384 |
G2M Testing Ltd |
|
LWD 2025 087 |
Dynatest |
3032-3274 |
Major Diamond Supplies Ltd |
|
LWD 2025 088 |
Dynatest |
3032-3307 |
Multipave (NW) Ltd |
|
LWD 2025 089 |
Dynatest |
3032-3202 |
Tonkin Materials Testing Ltd |
|
LWD 2025 090 |
Dynatest |
3032-3303 |
SpecTest UK Ltd |
|
LWD 2025 091 |
Dynatest |
3032-3330 |
White Rose Laboratory Services Ltd |
|
LWD 2025 092 |
Dynatest |
3032-3373 |
Wil-Test Solutions Ltd |
|
LWD 2025 093 |
Dynatest |
3032-3066 |
MDS Construction Materials Testing Ltd |
|
LWD 2025 094 |
Dynatest |
3032-3412 |
Stangers Ltd |
|
LWD 2025 095 |
Dynatest |
3032-3436 |
IGNE UXO Ltd |
|
LWD 2025 096 |
Dynatest |
3032-3250 |
Major Diamond Supplies Ltd |
|
LWD 2025 097 |
Dynatest |
3032-3435 |
IGNE Ltd |
|
LWD 2025 100 |
SWECO |
2210006 |
Balfour Beatty |
|
LWD 2025 101 |
SWECO |
1706002 |
Balfour Beatty |
|
LWD 2025 102 |
SWECO |
1905002 |
Balfour Beatty |
|
LWD 2025 103 |
SWECO |
2105004 |
Balfour Beatty (Scotland) |
|
LWD 2025 104 |
SWECO |
2011003 |
Balfour Beatty (Scotland) |
|
LWD 2025 105 |
SWECO |
1910003 |
Balfour Beatty |
|
LWD 2025 106 |
Dynatest |
3032-3159 |
Balfour Beatty Vinci |
|
LWD 2025 109 |
SWECO |
1601008 |
Balfour Beatty |
|
LWD 2025 110 |
SWECO |
1905005 |
Balfour Beatty |
|
LWD 2025 111 |
Dynatest |
3032-3153 |
Balfour Beatty (Scotland) |
|
LWD 2025 112 |
Dynatest |
3032-3309 |
EarthTest Laboratories Ltd |
|
LWD 2025 114 |
SWECO |
2310008 |
Celtest Ltd |
|
LWD 2025 115 |
Dynatest |
3032-3311 |
Card Geotechnics Ltd |
|
LWD 2025 116 |
Dynatest |
3032-3148 |
Balfour Beatty (Scotland) |
|
LWD 2025 117 |
Dynatest |
3032-3150 |
Balfour Beatty (Scotland) |
|
LWD 2025 118 |
SWECO |
1901009 |
Jean Lefebvre (UK) Ltd |
|
LWD 2025 119 |
SWECO |
2310019 |
Milestone Pavement Technologies Ltd |
|
LWD 2025 120 |
SWECO |
2310014 |
Celtest Ltd |
|
LWD 2025 121 |
SWECO |
2201874 |
Hixtra Ltd |
|
LWD 2025 122 |
SWECO |
2310004 |
Hixtra Ltd |
|
LWD 2025 123 |
SWECO |
2311007 |
Hixtra Ltd |
|
LWD 2025 124 |
SWECO |
2011003 |
Sports Labs Ltd |
|
LWD 2025 125 |
SWECO |
906001 |
Balfour Beatty |
|
LWD 2025 126 |
SWECO |
2311002 |
Sports Labs Ltd |
|
LWD 2025 128 |
Dynatest |
3032-3201 |
Sports Labs Ltd |
|
LWD 2025 129 |
Dynatest |
3032-3312 |
Concrete Testing Solutions Ltd |
|
LWD 2025 133 |
Dynatest |
3032-3158 |
TD Construction Testing Ltd |
|
LWD 2025 134 |
SWECO |
2002004 |
Sports Labs Ltd |
|
LWD 2025 137 |
SWECO |
2212013 |
Construction Testing Solutions Ltd |
|
LWD 2025 138 |
SWECO |
2310024 |
Simtec Materials Testing Ltd |
|
LWD 2025 139 |
Rincent |
MIN-214G |
Colas |
|
LWD 2025 140 |
Rincent |
MIN-213G |
Colas |
|
LWD 2025 141 |
SWECO |
801001 |
TD Construction Testing Ltd |
|
LWD 2025 142 |
SWECO |
2310020 |
Simtec Materials Testing Ltd |
|
LWD 2025 143 |
SWECO |
2103002 |
Mattest Site Services Ltd |
|
LWD 2025 144 |
SWECO |
1706004 |
TD Construction Testing Ltd |
|
LWD 2025 145 |
SWECO |
2310001 |
Simtec Materials Testing Ltd |
|
LWD 2025 146 |
SWECO |
2111619 |
Simtec Materials Testing Ltd |
|
LWD 2025 147 |
Dynatest |
3032-3304 |
TFW Group (Terra Firma) |
|
LWD 2025 148 |
Dynatest |
3032-3372 |
Testronix Ltd |
|
LWD 2025 149 |
SWECO |
2310034 |
Simtec Materials Testing Ltd |
|
LWD 2025 150 |
SWECO |
2210739 |
AF Howland Associates Ltd |
|
LWD 2025 151 |
Rincent |
MIN-161E |
SERVICE TECHNIQUE DE L'AVIATION CIVILE (DGAC) |
|
LWD 2025 152 |
Rincent |
MIN-261 |
Socotec UK Ltd |
|
LWD 2025 153 |
Rincent |
MIN-259 |
Socotec UK Ltd |
|
LWD 2025 154 |
SWECO |
1801002 |
Wills Bros Civil Engineering Ltd |
|
LWD 2025 155 |
SWECO |
1801003 |
Simtec Materials Testing Ltd |
|
LWD 2025 156 |
SWECO |
2111009 |
Mattest Site Services Ltd |
|
LWD 2025 157 |
Dynatest |
3032-3255 |
Harrison Group Environmental Ltd |
|
LWD 2025 158 |
Rincent |
MIN-262 |
Socotec UK Ltd |
|
LWD 2025 159 |
Rincent |
MIN-260 |
Socotec UK Ltd |
|
LWD 2025 160 |
SWECO |
1812008 |
Lincolnshire County Council |
|
LWD 2025 161 |
SWECO |
2008001 |
Eurotest Ltd |
|
LWD 2025 162 |
Rincent |
MIN-230 |
Paddock Geoengineering Ltd |
|
LWD 2025 163 |
Dynatest |
3032-3362 |
Surrey CC |
|
LWD 2025 164 |
SWECO |
1703004 |
Mattest Site Services Ltd |
|
LWD 2025 165 |
Terratest |
20250407098 |
Perry Testing Ltd |
|
LWD 2025 166 |
SWECO |
2212014 |
Mattest Site Services Ltd |
|
LWD 2025 167 |
SWECO |
2310021 |
Mattest Site Services Ltd |
|
LWD 2025 168 |
Dynatest |
3032-3157 |
Tensar International |
|
LWD 2025 169 |
SWECO |
2210009 |
Ringway Island Roads |
|
LWD 2025 170 |
SWECO |
2310017 |
Simtec Materials Testing Ltd |
|
LWD 2025 171 |
Rincent |
MIN-263 |
Socotec UK Ltd |
|
LWD 2025 172 |
Rincent |
MIN-264 |
Advantage Technical |
|
LWD 2025 173 |
Dynatest |
3032-3302 |
Tensar International |
|
LWD 2025 174 |
SWECO |
2212004 |
Ringway Island Roads |
|
LWD 2025 175 |
SWECO |
2103003 |
Wills Bros Civil Engineering Ltd |
|
LWD 2025 176 |
Dynatest |
3032-3252 |
Dynatest Hire |
|
LWD 2025 177 |
SWECO |
2310005 |
Simtec Materials Testing Ltd |
|
LWD 2025 178 |
Rincent |
MIN-235 |
Rincent |
|
LWD 2025 179 |
Rincent |
MIN-196 |
Socotec UK Ltd |
|
LWD 2025 180 |
Rincent |
MIN-181 |
Socotec UK Ltd |
|
LWD 2025 181 |
Rincent |
MIN-234 |
Socotec UK Ltd |
|
LWD 2025 182 |
Rincent |
MIN-227 |
Socotec UK Ltd |
|
LWD 2025 183 |
Rincent |
MIN-233 |
Socotec UK Ltd |
|
LWD 2025 184 |
Rincent |
MIN-199 |
Socotec UK Ltd |
|
LWD 2025 185 |
Rincent |
E32223 |
Socotec UK Ltd |
|
LWD 2025 186 |
Rincent |
MIN-232 |
Socotec UK Ltd |
|
LWD 2025 187 |
Rincent |
MIN-197 |
Socotec UK Ltd |
|
LWD 2025 188 |
Rincent |
MIN-129 |
Socotec UK Ltd |
|
LWD 2025 189 |
Rincent |
E70345 |
Socotec UK Ltd |
|
LWD 2025 190 |
Rincent |
E35138 |
Socotec UK Ltd |
|
LWD 2025 191 |
Rincent |
MIN-125 |
Socotec UK Ltd |
|
LWD 2025 192 |
SWECO |
2108765 |
Soil Property Testing Ltd |
|
LWD 2025 193 |
SWECO |
2310006 |
John Sisk & Son Ltd |
|
LWD 2025 194 |
SWECO |
1901008 |
Soil Property Testing Ltd |
|
LWD 2025 195 |
SWECO |
1901004 |
Labosport Ltd |