DISCUSSION OF MAKING USE J.M.F. CONSTRUCTED BY LABORATORY IN EXECUTION OF PROJECT (SURFACE COARSE, PMC, GWC, MASTIC ASPALT)

BRAHMAPUTRA CONSULTANTS AND TECHNOCRATS

SEUJ BAN PATH, FATASIL AMBARI, GUWAHATI-781 025

(Regd. No.:RF/KM/143/514 of 1997-98)

94353-03112, 98645-07347 (M)

MIX-DESIGN OF 20 mm Open Graded Premix Surfacing

20 MM OPEN GRADED PREMIX SURFACING

Name of Work:- Upgradation of Road from Abdullapur to Dinonathpur via Koya-Tantoo-Ramchandi under

AACP Rural Road Component in Hailakandi District, Contract Ni. HLK-4.

INTRODUCTION :-

This samples were subjected to various Laboratory Test and finding were given thus.

Sample No. 1.Sample No 1= Nominal size 13.2 mm.

2.Sample No 2= Nominal size 11.2 mm.

3.Binder 80/100 Grade Paving Run Bitumen

It has been intimated by the client that samples are obtained from dump kept at site in size for utilization on roads as such design has to be worked out within frame works of this keeping this aspect in view, all samples are sieved out and ascertained that requirement of 20 mm thick Open Graded Premix Surfacing would be met by the sample no 1, sample no 2 with 80/100 Grade Bitumen.

ALL PHYSICAL PROPERTIES OF AGGREGATES AND BITUMEN ARE AS FOLLOWS:-

Grain size analysis : Coarse aggr. Do not contain materials passing more then 5% in 0.075

mm IS sieve

INDIVIDUAL GRADING OF THE AGGREGATE:

P.C. Passing by wt. of dry Aggr. I.S. Sieve (mm)22.413.211.25.62.36.180Sample 1100550---Sample 2-10052---

Following tests conducted on resultant of aggregate used for open graded premix

carpeting:-

Specific Gravity and Bulk Density of Aggregate:-

PHYSICAL PROPERTIES OF PAVING RUN BITUMEN

The results obtained satisfy the requirement of S-90 (80/100) Grade Bitumen as per I.S. Code.

NAME OF TESTSRESULTSSpecification 1. Aggregate Impact value in P.C.20.00MaxM 30 P.C2. Combined Flakiness & Elongation Index Test in P.C.23.00MaxM 30 P.C3. Water absorption on P.C.0.750MaxM 1 P.C4. Stripping value in P.C. NIL i.e 100% Coating MaxM 5 P.C Stripping Sample No.Specific GravityBulk Density, Km/m3Sample 12.6821645Sample 22.6671660Blending Material (Sample 1 & Sample 2)-1650SL. No.Name of WorkResults1.Penetration value 100gm, 5 Sec, 250c, 1/100 cm 852.Ductility tests at 270c in cm. 75+3.Softening point in 0C494.Specific Gravity 1.01

PROPORTIONING OF MIXTURE FOR OPEN GRADED PREMIX CARPETING

Aggregate are proportion complying with the MOSTS specification if Fourth Revision by volume ie Sample 1: Sample 2 = 2:1 (Ratio by Volume in P.C.)

COMPOSITION OF AGGREGATE( 20 mm Open Graded Premix Surfacing)

COMPUTATION OF MATERIALS FOR 10 M2 AREA 20 MM THICK OPEN- GRADED PREMIX SURFACING AS PER SPECIFICATION

NB:- I) Both aggregate and Bitumen are to be heated 1500C to 1650c & 1600c respectively and

then mix up in pug mill and laid over PMC and rolled.

II) Check the grading analysis of the materials at the time of execution.

IS Sieve P.C. by wt. of dry aggr. Passing in SieveProportional, P.C. of different SampleCombined Grading Sample 1Sample 2Sample 1Sample 267%33%22.4100100673310013.25510036.853369.8511.2NIL52-17.16175.6-NIL--0Sample No. Materials By Volume M3Materials By Weight Related To Loose Density, kgSample No. 10.18296Sample No. 20.09149Binder 80/100 grade Bitumen14.6 kg 14.6 kg

BRAHMAPUTRA CONSULTANTS AND TECHNOCRATS

SEUJ BAN PATH, FATASIL AMBARI, GUWAHATI-781 025

(Regd. No.:RF/KM/143/514 of 1997-98)

94353-03112, 98645-07347 (M)

Design of Gravel Soil Mixture for Granular Wearing Course.

Subject:- Determination of MDD and OMC of Gravel Wearing Course material against contract No. NL (R)-2

Introduction

Following Test done at Laboratory

1.Gradation.

2.Determination of P.C. of each so as to obtain desired resultant gradation.

3.Atterbergs limit test.

4.M.D.D. Test for mixure (Maximum Dry Density)

We have followed the for 400-3 of MORD Specification for Guidance.

That various combinations come to conclusion that materials adopted by us is provided the solution.

1. Gradation

Sample No.Sieve Sizes mm 26.519.04.752.36.425.075S-1Sand Gravel 100923230101S-2Silt1001001001008030S-3Clay 10010010010010060S-4Silt10010010010010090

If appears that material natural occurring after discarding (+) 26.5 mm size, is within the limit required for mechanical stability but it does not contain sufficient clay to act as binder so as to obtain good compaction and also meet up deficiency in inter-locking in respect of uncrushed gravel, Moreover higher liquid limit and plasticity indices are desirable in the surfacing in order to provide greater cohesion and to help offset the moisture by evaporation unless it is intended ultimately receive some other more permanent surfacing.

Considering all pros & cons of the matter it is proposed to proportion 80 P.C. of gravel material (S-1) 20, 15 P.C., Clay (S-3). 85 P.C. of S-4 clay in order to obtain mechanically stable product.

The fraction passing the No. 425 mic sieve shall have the following characteristics.

For Surfacing:- Liquid limit not exceeding P.C.

Plasticity index between 4-10

Proportioning of Aggregates Mixture for Surfacing

1234567IS Sieve SizePercentage Passing Required size distribution Aggregate Available MixtureLimits Average SandGravel S-1SiltS-3Clay S-480 P.C.S-115 P.C.S-35 P.C.S-426.510010010010010010019.097-10098.592100100944.7541-71563210010045.42512-28201010010028.0759-1612.51609014

The values of M.D.D., Limits of mixture & Bulk Density of Sample, 1(A), 1(B) & 1(c) given.

Quality needed 100 m2 of area of 100 mm thick compacted

i) Compacted weight of mixture= 100 X .100 X 2310 = 23100 kg.

Sample S-1 (G)= 23100 X .80 = 18480 kg or 9.99 m3

Sample S-2 (Silt)= 23100 X .15 = 3465 kg or 2.19 m3

Sample 1(C) (Clay)= 23100 X .05 = 1155 kg or 0.85 m3

Test ResultsType of MaterialContents in P.C. Atterberg Limits M.D.D.Gm/ccBulkdensity(kg/cm3)in drycondition C.B.R.Sample No-1Sand GravelSiltSilt & ClayLL%PL%PI%MDDOMCIn P.C.Sand GrandS-168311-----1850-Silt & ClayS-3-406030.0023.906.10--1580-ClayS-4-109037.4024.3013.10--1350-Mixture 55311425.2019.605.602.316.50--

BRAHMAPUTRA CONSULTANTS AND TECHNOCRATS

SEUJ BAN PATH, FATASIL AMBARI, GUWAHATI-781 025

(Regd. No.:RF/KM/143/514 of 1997-98)

94353-03112, 98645-07347 (M)

Design of Mastic Aspalt for Bhangagarh Fly Over Guwahati

Introduction

The following three numbers of samples i.e. Sample 1 Coarse Aggregate, Sample 2 Dust & Sample 3 Hydrated Lime are forwarded by the client to our Laboratory for designing the 12.0 mm thick Mastic Aspalt to be utilized in Bhangagarh Fly Over. The M/S B.C.T. has subjected all these samples to various test and it was realized that dust & lime need to be replaced and coarse aggregate is to be sieve out in 2.36 mm sieve and (-1) 2.36 mm aggregate is to be discarded. However the client has replaced the dust and lime latter.

A) The Gradation of Coarse aggregate after discarded the (-) 2.36 mm sieve is thus

B) Gradation of Dust & Lime taken into design.

Gradation of Coarse AggregateIS Sieve mm, Passing IS Sieve mm RetainedP.C. Passing coarse aggregate9.506.3016.304.75564.752.3643Gradation of Dust & LimeIS Sieve mm, Passing IS Sieve mm RetainedP.C. Passing, DustP.C. Passing, Lime0.075-14.077.00.2120.07519.010.00.6000.21240.09.02.3600.60027.04.0

Lime had been sieve out by 2.36 mm sieve & (+) 2.36 mm has been discarded. It may be pointed out that lime supplied by BHUTAN does not serve the purpose as such lime from MEGHALAYA has been utilized in the Mix. The client again had supplied one lime sample.

Now 17% Bitumen (85/25 Grade industrial Bitumen) has been taken of wt. mix consisting of fine aggregates & filler.

The resulting proportion of each i.e. Dust 54%, Lime 29%, Bitumen 17%.

In was concluded that adding of 35% of coarse aggregate of total mix, the mix would suffix the purpose.

The final proportion will be coarse aggregate 35%, Dust 35%, Lime 19% & Bitumen 11%

JOB MIX FORMULA FOR 16 PC BINDER

i) Fine Aggregate= 65 PC

ii) Filler= 35 PC

Binder = 16 Pc of mix wt.

F.A. & Filler = 84 PC

F.A.= 54.6 PC

Filler= 29.4 PC

Proportion of total Mix C.A.- 35 PC of total Mix therefore 65 PC would be binder

Binder 16x.65 = 10.4 PC

F.A. 54.6X.65 = 35.49 PC

Filler 29.4x6.5 = 19.11 PC

Therefore proportion became

C.A -35 PC

F.A -35.5 PC

Filler 19.1 PC

Binder 10.4 PC

A test track utilizing various type of mixes suggested in this report is to be laid the one which suits, should be adopted to.

THE HARDNESS NUMBER OF FINAL MIX IS ASCERTAIN TO BE 14 AT 250 C

IS Sieve mm, PassingIS Sieve mm RetainedP.C. Passing, DustP.C. Passing, LimeProportionCombinedSpecificationPC, Dust 65%PC, Lime 35%0.075-14779.126.953630-500.2120.075191012.353.501610-200.6000.21240926.03.15295-352.3600.60027417.551.40190-25