A Self-Learning Manual - Institution of Engineers Mauritius

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A Self-Learning Manual Mastering Different Fields of Civil Engineering Works (VC-Q&A Method) Vincent T. H. CHU These beads are sprayed on the marking materials when the road is marked. The beads are transparent and serve as lenses. When the light passes through the beads, it is refracted through the beads and then reflected back towards the original path of entry. The use of glass beads enhances retroreflectivity which raises the safety level for night driving. Fig. Glass bead in road marking 18. Why is hot applied thermoplastic road marking normally used instead of cold applied road paint? (ORF6) Hot applied thermoplastic road marking appears to be more commonly used than cold applied road paint as road marking materials. For hot applied thermoplastic road marking, it allows the addition of solid glass head which enhances reflectorisation effect. This essentially makes great improvement on the visibility of road markings at night time. Moreover, from past experience the durability of thermoplastic road marking is higher than that of road paint. 19. What are the advantages of using rockfill over earthfill to build road embankment? With the use of rockfill to build embankment, it is not a concern regarding the build-up of pore water pressure during construction so that the embankment can be filled at the faster rate. Moreover, the use of rockfill allows a steeper angle in forming road embankment when compared with earthfill so that it results in a small amount of fill. As such, it helps save the cost of construction. 288
A Self-Learning Manual Mastering Different Fields of Civil Engineering Works (VC-Q&A Method) Vincent T. H. CHU 8. Module Seven: Slopes, Excavation and Earthwork Objectives Element Description Objective No. Slope Slope Janbu’s method, Bishop’s method and Morgenstern-Price method Compaction of fill slope S2 Liquefaction of loose fill slope S3 Cutting slope S4 Landslides by rainfall S5 Rockfall S6 Reinforced fill S7 Decomposed dolerite dykes/ colluvium S8 Slopes Features Drainage system and protective covers SF1 Erosion control mat SF2 Vegetation SF3 Sprigging/turfing/hydroseeding SF4 Concrete buttress SF5 Rock reinforcement SF6 Rock dowels and rock bolts SF7 Rockfall barrier SF8 Horizontal drains SF9 Excavation Design Free earth support method and fixed earth support method D1 Rankine’s theory of lateral earth pressure D2 Peck’s pressure envelope D3 Loads in struts D4 Features Excavation of Diagonal strutting and long flying shores FE1 Grout curtain FE2 Tiebacks in anchored excavation FE3 Diaphragm Wall Function DW1 Excess slurry head DW2 Bentonite slurry DW3 289 S1
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A Self-Learning Manual - Institution of Engineers Mauritius

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