Structural evaluation and analytical overlay design

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Reference no: EM131367334

Its aim is to assess your knowledge on computational procedures for pavement structural evaluation and analytical overlay design.

Q1. A motorway section of length 7 km was tested with an FWD. Deflections were measured at 200 m intervals along the above section. The deflections were recorded at radial distances of 0, 0.6 and 1.5 metres from the centre of the load. The applied stress was 700 kPa and the radius of the loading plate was 15 cm.

The construction details of the pavement were as follows:
1. Layer 1: bituminous material, thickness 19 cm
2. Layer 2: granular material, thickness 40 cm
3. Layer 3: subgrade soil, good drainage conditions.

The temperature during testing was 200C.

The overall pavement condition should have been above average.

The deflection data were as follows:

Deflections (microns)

Chainage (km)

d(0)

d(600)

d(1500)

0.200

424

296

22

0.400

267

205

28

0.600

288

204

14

0.800

248

192

15

1.000

220

164

17

1.200

174

139

23

1.400

252

174

20

1.600

229

168

20

1.800

169

129

25

2.000

210

155

14

2.200

179

135

20

2.400

217

170

23

2.600

224

163

26

2.800

351

239

18

3.000

649

305

19

3.200

363

271

28

3.400

353

256

21

3.600

312

234

22

3.800

359

222

19

4.000

565

309

30

4.200

443

284

26

4.400

432

286

27

4.600

339

235

16

4.800

395

264

12

5.000

270

197

20

5.200

346

254

23

5.400

298

203

20

5.600

275

190

17

5.800

336

222

18

6.000

485

292

20

6.200

511

333

30

6.400

273

200

22

6.600

271

180

14

6.800

225

173

23

7.000

250

174

19

Useful note for tutor

You can solve it in this way

1

d(0)

d(600)

d (1500)

60

R

t1

t2

V

E1

E2

E3

d(0,c)

E

t

c

Nf

Nd

N

 

 

 

 

 

 

 

 

 

 

=2.5

Surface module  concept

Seek function

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Q2

Using a spreadsheet, and both the Surface Modulus concept and the Method of Equivalent Thickness (MET) in a simplified manner, analyse the structural condition of the road section by estimating (a) the moduli of the layers and (b) their remaining life using the following relationships:

Nf = ((5620)/εl)1.16

Nr = ((15000)/εc)3.95

Verified Expert

The assignment discusses the analysis of various parameters with the deflection values of a pavement design. The youngs modulus and residual modulus is determined using standard equations. the mean, standard deviation are calculated. the concept of the overlay is discussed and the same is designed for the given three layered pavement structure.

Reference no: EM131367334

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Reviews

inf1367334

2/2/2017 5:19:15 AM

I am an international student and it was troublesome for me to take a shot at the same pace with local speaker understudies. On account of ExpertsMind I figured out how to manage B student without restless evenings!

inf1367334

2/2/2017 5:15:23 AM

1st question is solved in excel sheet as per the table provided. A values for the parameters are in excel sheet along with necessary formula and reference. The value of E1 in first question must be estimated 2000. Also, E2 is different from you question to attached file.

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