In this blog article, I am going to tell you about top 50 most asked TANROADS interview questions and answers for both civil technician and engineer which is often asked in all TANROADS interview.
If you are a civil technician or engineer TANROADS job seeker then you should be prepared well to give correct answers to the interviewer so that it will be a maximum chance for you to get in a job post.
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Let get started....
1. What is the meaning of soil reinforcement?
Answer: Soil reinforcement is the act of improving soil strength to enable
it to support or carry more load.
2. What are the commonly materials used for soil reinforcement
Answers: Lime, Cement and Aggregates.
3. Define what are the reasons for geotechnical site
investigations?
Answers:
i)To know the soil properties in so doing be position to determine whether
the particular site is suitable for the purpose intended
ii) To know the history of the site
iii) To know what remedies need to be put in a place before construction
can start
iv) Based on the soil properties that can be determined on site and in the
lab, design the appropriate foundation for the structure
4.Describe three types of slump that may occur in the slump test
Answers:
True Slump
Shear Slump
Collapse Slump
5.What do you understand by the term 'TANROADS'.?
Answer: TANROADS is the abbreviation for Tanzania National Roads Agency, is
an executive agency under the Ministry of Works, starting it operation on
July 2000 agency responsibilities is to develop and maintain truck and
regional road network in Tanzania Mainland
6.What are the sources of pavement failure.?
Answers:
i) Poor compaction for pavement layers
ii) Use of problem soils in pavement layer
iii) High water table underneath
iv) Poor drainage system
v) Heavy load of traffics
7. What is Gravity flow.?
Answer: Gravity flow is fluid flowing due to the forces of gravity alone
and not to an applied pressure head.
8.What are three major types of reinforcement used in
pre-stressing?
Answers:
i) Spalling reinforcement
ii) Equilibrium reinforcement
iii) Bursting reinforcement
9.Why do we maintain roads and what are the benefits from maintaining
roads?
Answers:
i.To preserve the road as per built state, keep it passable and open in all
time under all-weather condition and to enable it to attain its design life
& To protect the investment
ii.Reduces the rate of pavement deterioration
iii.It lowers the cost of operating vehicles on the highway by providing a
smooth running surface
iv.It keeps the highway open on a continuous basis by preventing it from
becoming impassable
v.It enhances safety
10.Mention at least 7 essential documents which form a contract document
for construction works:
Answers:
i) Contract Agreement
ii) Letter of Acceptance
iii) Contract offer
iv)Special Condition of Contract
v)General Condition of Contract
vi)Specification
vii)Drawings
viii)Priced Bill of Quantities
11.Mention and briefly explain four stages of construction project
Answers:
i)Briefing Stage
ii)Design Stage
iii)Tendering Stage
iv)Construction Stage
v)Completion/Handing over Stage
12.Mention the supporting documents attached to payment certificate for
construction works
Answers:
i)Measurement sheet
ii)Material test results
13.Mention at least four Laboratory Test required for construction
materials in road construction
Answers:
i)California Bearing Ratio (CBR)
ii)Compaction test (Proctor test)
iii)Atterberg Limit (Liquid Limit, Plastic Limit & Shrinkage
Limit)
14.What is traffic count.?
Answer: Traffic count is a count of traffic along a particular road, either
done electronically or by people counting by the side of the road.
Uses of Traffic count data in road works
i)Used for road geometric design
ii)Used for Traffic Signal Design
iii)Used for Road Pavement Design
15. Which test is conducted to determine the bearing capacity of
soil?
Answer: Plate Load Test
16. What do you do if any concrete cube fails in 28 days compressive
strength test?
Answer: If the concrete cube fails in strength test, you should conduct a
core cutter test on concrete and send a report to higher authorities.
17. What is soil analysis?
Answer: Soil Analysis is the testing of soil to determine the nutritional
and elemental composition of soil. It is generally tested for knowing the
contents of Nitrogen, Potassium and Phosphorous.
18.Which load computed from traffic count data used for road pavement
design.?
Answer: Axle Load
19.Describe briefly the various methods of concrete curing
Answers: Curing is the process of maintaining the moisture and temperature
conditions for freshly deployed concrete. This is done for small duration of
time to allow the hardening of concrete.
The methods that are involved in saving the shrinkage of the concrete
includes
i)Spraying of water: on walls, and columns can be cured by sprinkling
water
ii)Wet covering of surface: can be cured by using the surface with wet
gunny bags or straw
iii)Ponding: the horizontal surfaces including the slab and floors can be
cured by stagnating the water.
iv)Steam curing: of pre-fabricated concrete units' steam can be cured by
passing it over the units that are under closed chambers. It allows faster
curing process and results in faster recovery.
v)Application of curing compounds: compounds having calcium chloride can be
applied on curing surface. This keeps the surface wet for a very long
time.
20.What are the core activities of TANROADS
Answers:
i) Road and bridges Construction
ii)Road and Bridges Maintenance
iii)Weighbridges Operation Services
iv)Advise/work together with other Road authorities
21.What is California Bearing Ratio (CRB)?
Answer: The California bearing ratio is a penetration test for evaluation
of the mechanical strength of soil for road construction uses and the
minimum value of CBR used for road construction works is 3%.
22.Mention a test which used to check the concrete workability
Answer: Slump test
23.Mention four layers of road pavement
Answers:
i)Sub grade Layer
ii)Sub base Layer
iii)Base course Layer
iv)Wearing course Layer
24.What is the importance of air voids content in bituminous
pavement?
Answers:
A sufficient amount of air voids should be designed to make room for
expansion of binder in dry season consolidation under traffic loads.
25.Mention three properties affected by overheating bitumen?
Answers:
i)Rheological properties of bitumen
ii)Hot mix Asphalt (HMA) properties
iii)Cohesion of bitumen
26. Why is it necessary to know the natural moisture content of the
soil to be used for construction purpose?
Answer: Helps to estimate the additional water that will give the maximum
dry density.
27.Mention (8) eight tests which are common on aggregates and
concrete
Answers:
i)Aggregate Crushing Test
ii)Ten Percent Fines Test
iii)Aggregate Impact Test
iv)Flakiness Test
v)Elongation Test
vi)Soundness Test
vii)Los Angeles Abrasion Test
viii)Sieve Test
ix)Specific Gravity Test
x)Water Absorption Test
28. Mention four (4) roads maintenance categories and for each category
list three corresponding activities
Answers:
i)Routine Maintenance
ii)Periodic Maintenance
iii)Emergency/ Urgent Maintenance
iv)Bridge Maintenance and Repair
29.What are the functions of TANROADS
Answers:
i)Management of Maintenance and Development of works
ii)Operations of the Roads Networks and Axle Load Control
iii)Implementation of Road Safety and Environmental Measures
iv)Provision of advice on the strategic framework, policies and plans
30.What are the types of cement?
Answers:
i)Ordinary Portland Cement
ii)White Portland Cement
iii)Portland Pozzolana Cement
iv)Low Heat Portland Cement
v)Rapid Hardening Cement
vi)Sulphate Resisting Portland Cement
31. What is the aim of structural design of pavements?
Answer: To protect the subgrade by provision of appropriate pavement layers
to achieve a determined level of service with maintenance over a chosen
design period.
32. What is pavement rehabilitation.?
Answer: Is defined as taking constructive measures to restore the
structural and functional condition of roads where distress has caused
unacceptable pavement serviceability.
33.Construction and maintenance considerations that must be taken into
account in the pavement design which may influence type of pavement that
is adopted or material standard and type of surfacing to be used.
Answers:
Extent and type of drained
Use of stabilization
Availability of equipment, materials and human resources
Construction under traffic
Maintenance strategy
Use of stage construction.
34.What are the environmental factors which have the greatest effect on
pavement performance are.?
Answers:
Moisture regime in the pavement structure
Pavement temperature
Unfavorable subgrade conditions related to the environment
35.Moisture changes in pavements usually ensue from one or more of the
following sources and their preventive measures.
Answers:
i)Relative permeability of pavement layers and subgrade and
ii)Infiltration from the surface and shoulders
Both can be controlled through appropriate design of the cross section and
internal drainage of the pavement layers
iii)Seepage from higher ground and
iv)Fluctuation in the water table
Both can be controlled by adequate installed subgrade and pavement
drains
v)Transfer of moisture within the surface due to differences in moisture
content or temperature
Cannot normally be controlled other than by attempting to keep the moisture
content near constant
36.What are the effects of pavement temperature on the performance of
bituminous mixes have been observed on the following?
Answers:
i)Load distributing properties
ii)Resistance to deformation
iii)Resistance to fatigue cracking
iv)Rate of ageing
37.Four unfavorable subgrade condition for road bed.
Answers:
i)Cavities made by burrowing animals
ii)Localized areas with high moisture content
iii)Subsurface well
iv)Swamp areas
38.What is the purpose of EIA (Environmental Impact Assessment)?
Answer: Purpose of EIA is to ensure that a project does not achieve its own
goals at the expense of loss or inconvenience to non-beneficiaries or future
generations.
39. Four important functions of paved shoulders are:
Answers:
i)Provision of lateral support for pavement layers
ii)Minimizing risks of moisture ingress into load bearing parts of the
pavement
iii)Reducing changes in moisture contents in pavement layers
iv)Improved traffic safety by allowing occassional traffic outside the
carriageway.
40.The structural deterioration of paved roads caused by traffic mainly
depends on:
Answer:
i. Magnitude of the loads (Axle Loads)
ii. Contact Pressure from the Load (Mainly from Tires pressure)
iii. Number of load repetitions
41. What is the Pavement Design Life?
Answer: Number of years until a terminal value of accepted serviceability is expected to be reached.
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