CIVIL ENGINEERING DEPARTMENT

PRACTICAL TRAINING SEMINAR

PRACTICAL TRAINING SEMINAR

GURJAR KI THADI UNDERPASS, JAIPUR

JAIPUR DEVELOPMENT AUTHORITY

Jaipur Development Authority, a body constituted under Jaipur Development Authority Act 1982(Act.25) under the Department of Urban Development and Housing, Government of Rajasthan.

JDA has been committed to work for the benefit of the citizen of Jaipur with planned implementation of development scheme and is consistently striving to take Jaipur at higher levels of progress.

JAIPUR DEVELOPMENT AUTHORITY

ABOUT THE PROJECT AND SITE

One of the busiest intersection due to traffic congestion.

More possibilities of accidents. Earlier proposal was the construction of 4 lane

flyover. Then metro corridor proposed from Mansarovar to

Ajmer road via Gurjar Ki Thadi intersection. And so the construction of underpass on Gurjar Ki

Thadi decided.

PROJECT PROFILE

Name of the work = Gurjar Ki Thadi Underpass Department = Jaipur Development Authority,

Jaipur. Agency = ARSS Infrastructure Pvt. Limited. Consultant = N.K. Buildcon Pvt. Limited. Cost of Project = Rs 28,27,44,480 Date of Started = 13.10.2009 Duration = 18 Month

ADVANTAGES OF UNDERPASS

Reduction of load of heavy vehicle. Reduction in the rate of accidents. Will provide convenient crossing through

intersection. Waiting on traffic signal will be for less

interval. Heavy vehicles can pass without affecting

local traffic.

PARTS OF CONSTRUCTION

GURJAR KI THADI

UNDERPASS

GOPALPURA SIDE

BOX

MANSAROVAR SIDE

DETAILS OF UNDERPASS

Total Length of Underpass = 374 m

Length of Cover part or Box = 61 m

Approach Slope = 1:40

Total width of Underpass = 20.4 m

Width of footpath on both side = 0.6 m

GENERAL ARRANGEMENT DRAWING

PROJECT CONSTRUCTION

DETAILS OF GOPALPURA SIDE

Approach length toward Gopalpura Side = 205 m.

Divider Width of Gopalpura Side = 1.20 m.

RCC Retaining Wall towards Gopalpura Side = 250 to 180 = 70 m.

Anchor pile Gopalpura side = 174(L), 174(R)

DETAILS OF MANSAROVAR SIDE

Approach length toward Mansarovar Side = 108 m

Divider Width of Mansarovar Side = 2.80 m

RCC Retaining Wall towards Mansarovar Side = 124 to 90 = 34 m

Anchor pile Mansarovar side = 92(L), 82(R)

DETAILS OF ROAD

Width of Underpass = 23.20 m.

Service Road(on both sides) = 7 m.

Both Side footpaths = 0.6m.

GSB (Granular Sub Base) = 230 mm.

ELEVATION VIEW

TEST PERFORMED AT THE SITE AND AT BATCHING PLANT

• CONCRETE COMPRESSIVE STERNGTH TEST At 3-Days At 28-Days• SLUMP TEST• GRADATION/ SIEVE ANALYSIS (COARSE

AGGREGATES)• GRADATION/ SIEVE ANALYSIS(SAND)• AGGREGATE IMPACT VALUE TEST• IN SITU DENSITY TEST- SAND REPLACEMENT

METHOD ( FOR GSB)

CONCRETE COMPRESSIVE STERNGTH TEST

At 3 –Days for M40 grade concrete

CONT…….

Compressive strength= crushing load/area of specimen

CS=76000/225=337.78 Kg/cm2(for 1st cube )

CS=66000/225=293.33 Kg/cm2(for 2nd cube)

CS=78000/225=346.67 Kg/cm2(for 3rd cube)

Avg. compressive strength=337.78+293.33+346.67

3

=325.93 Kg/cm2

Cont……

At 28-Days for M40 grade conrete

SLUMP TEST FOR CONCRETE

Slump is a measurement of concrete’s workability.

a cone, 300 mm of height. The base is 200 mm in dia and it has a smaller opening at the top of 100 mm .

The slump value at the site was =90mm (For M40) for slab of Box

SIEVE ANALYSIS(COARSE AGGREGATE)

Quantity of aggregate = 5000 gm Material name = 20 mm aggreget

Cont………..

Quantity of aggregate = 3000gm Material name = 10mm aggregate

SIEVE ANALYSIS ( SAND)

Quantity of sand = 500 gm Material name = Sand

Cont………

Fineness modulus :-A measure of the fineness or coarseness of an aggregate sample, usually the fine aggregate (sand). It is determined by adding the cumulative percent retained on each of a specified series of sieves, and dividing the sum by 100.

FM = Sum(Cumulative % retained)/100

FM= 4.2+17.40+25.60+53.60+82.40+95.80

100

FM = 2.79

AGGREGATE IMPACT VALUE TEST

Material name = 20 mm aggregate Quantity of aggregate = 1500 gm

Cont…………..

AIV = weight of crushed aggregatr passing through 2.36mm sieve x 100

weight of dry aggregate taken

AIV= 81 x 100

339

AIV= 23.89 % (for 1st trial)

23.44% (for 2nd trial)

24.11% (for 3rd trial)

23.46% (for 4th trial)

Average Value = 23.73 %

IN SITU DENSITY TEST- SAND REPLACEMENT METHOD ( For GSB)

Cont………….

Max. dry density of sand=2.145gm/cc

Bulk density of sand =2025/1505.58=1.345gm/cc

Weigth of soil from hole=3110gm

Wet density of soil=3110/1505.58=2.066gm/cc

Moisture content(w) =5.0%

Dry density of soil=wet density of soil/(1+w)

= 2.066 /1.05=1.968gm/cc

Degree of compaction =1.968 x100/2.145=91.75%

CONCRETE MIX DESIGN OF M40 GRADE(using OPC-43 Vikram ultra tech cement)

Design as per IS : 10262 What is mix design The process of selecting suitable ingredients of

concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible, is termed the concrete mix design.

M40 grade used in this project for construction. To aarive a proper design mix , specific gravity of coarse

aggregate and fine aggregates was determined in site laboratory at casting yard.

Cont…..

Parameter for mix design M40

fine aggregates = 2.67

Coarse aggregates = 2.63

degree of control = good

Exposure = moderate

Nominal mix of aggregates = 20mm

Grading of sand = Zone-II

Cont……

Target strength (ft) = fck + K. S

Ft=40 +1.65X6.6

Ft=50.89 N/mm2

Water content =162 Kg

W/C ratio for 43-OPC (as per curve E) = 34%

Cont………..

Cont……

Cement content = 162/.36 =450 Kg

Sand as percentage of total aggregate considering volume = 34%

Considering fully saturated dry aggregate and free moisture in sand

Now considering 2% entrapped air for 20mm grade aggregate

Cont……

For Fine aggregate

V = [ W + (C/Sc) + (1/p) . (fa/Sfa) ] x (1/1000) V -is absolute volume of fresh concrete

W -is mass of water(Kg) in per cubic meter of concrete

C –is mass of cement(Kg) in per cubic meter of concrete

Sc = specific gravity of cement,

(p) = Ratio of fine aggregate to total aggregate by absolute volume ,

fa = total mass of fine aggregate

Sfa = specific gravities of saturated surface dry fine aggregate

Cont……

0.98 = [ 162 + ( 450 / 3.15 ) + ( 1 / 0.34 ) ( Fa / 2.67 )] ( 1 /1000 )

Þ Fa = 613.027 kg

Say Fa = 613 kg.

FOR COARSE AGGREGATE

V = [ W + (C/Sc) + {1/(1-p)} . (ca/Sca) ] x (1/1000)

0.98 = [ 162 + ( 450 / 3.15 ) + ( 1 / 0.64 ) ( Ca / 2.63)] ( 1 /1000 )

=> Ca = 1171.36 kg.

Say Ca = 1171 kg.

Cont……..

Hence Mix details per m3

Cement = 450 kgWater = 162 kgFine aggregate = 613 kgCoarse aggregate 20 mm = 703 kgCoarse aggregate 10 mm = 468 kgAdmixture(fosroc Sp 500) = 1 % by weight of cement = 4.5 kg.

Water: cement: F.A.: C.A. = 0.34: 1: 1.36: 2.60