0

As per the MORTH technical specification, following Test Frequency and Acceptance Criteria of Road Construction Materials are adapted for Flexible Pavements.

Road Construction materials – Tests on soil:

Following test frequency and acceptance criteria of road construction materials are selected for embankment and subgrade construction.

S.NO.Type of TestFrequency Location Acceptance Criteria
1.1

Borrow Material for Embankment and Subgrade:

(i)Sand Content (IS: 2720 Part 4)Two tests per 3000 cu.m of soil.Grid the borrow area at 25 m c/c 
(ii)Plasticity Test (IS: 2720 Part 5) e.g. LL, PL & PITwo tests per 3000 cu.m  of soil.Grid the borrow area at 25 m c/cLL<70%

 

PI<45%

(iii)Density Test (IS:2720 Part  8)Two tests per 3000 cu.m of soilGrid the borrow area at 25 m c/cMax laboratory dry Unit weight

 

Embankments up to 3m height, not subjected to extensive flooding: Not less than 15.2 KN/cu.m.

Embankments exceeding 3 m height or any height subject to long periods of inundation: Not less than16.0 KN/cu.m.

Sub-grade/earthen shoulder/ verge/backfill : Not less than 17.5 KN/cu.m.

(iv)Deleterious content Test  (IS:2720 Part 27);As and when required by the Engineer.Grid the borrow area at 25 m c/c 
(v)Moisture content Test                     (IS: 2720 Part 2)One test for every 250 cum of soil.In  situ-2% to+1% of OMC
(vi)CBR test on the material to be compacted in the sub-grade on soaked  samples (IS:2720 Part 16)One CBR test for every 3000 cum or closer as and when required by the Engineer.Grid the borrow area at 25 m c/cNot less than the designed CBR value 8% and 10 % at 97% of MDD (4 days soaked value)
1.2Compaction control (IS:2720 Part 28) on each layer

 

(MORTH Spec. 903.2.2

One Density test for each 1000 sq.m of compacted area for the body of the embankment, to be increased to one  test per 500 sq.m of compacted area for sub-grade i.e. top 500 mm portion of embankment [1.65- {1.65/(no of the sample)^0.5}] times the standard deviationIn situRelative compaction as  %  of max. laboratory dry density

 

Embankment not less than 95%

Sub-grade/earthen shoulder not less than  97%

1.3Surface  Levels

 

(MORTH Spec. 902.3)

Every 10 m intervalIn situSub-Grade

 

+ 20mm to

(-) 25mm

2.0

GSB and WMM Road Construction Materials:

Granular Sub Base(GSB) is road construction materials. It is known as subbase, which is the layer of aggregate material placed on the subgrade, on which the WMM layer as a base course is found.

S.NO.Type of TestFrequency Location Acceptance Criteria
2.1

GSB Material:

(i)Gradation (IS: 2720 Part 4 as per job mix formulaOne test per 200 cu.mStock Yard/In situAs per Table 400- 1 of MORTH Specs for R & B Works.
(ii)Atterberg Limit (IS:2720 Part 5)One test per 200 cu.mStock Yard/In situLL & P.I. not more than 25 and 6% respectively.
(iii)Moisture content prior to compaction (IS:2720 Part 28)One test per 250 sq.m.In situOMC –2% to OMC + 1%
(iv)The density of the compacted layer (IS:2720 Part 28)One test per 500 sq.mIn situMean density not less than the specified density + [1.65- {1.65/(no of the sample)^0.5}] times the standard deviation
(v)Deleterious (IS:2720 Part 27)As requiredStock Yard/In situ

(vi)C.B.R. (IS:2720 Part 16)As requiredStock Yard/ In situNot less than  30%
(vii)Water absorption (IS: 2386 Part III)As requiredStock Yard/In situ2% maximum.

 

If this value is more than 2%, the soundness test to be carried out.

(viii)Soundness (IS:2386 Part 5)As requiredStock Yard/ In situ12%  maximum with Na2 So4,

 

18% with Magnesium Sulphate 

(ix)10% Fines Value of Coarse aggregate BS 812 (Part-111)As requiredStock Yard/In situ50 KN or more in soaked condition
(xi)Surface Level MORTH, Spec. 902.3Every 10 m intervalIn situ+ 10mm to –20 mm
2.2

WMM Material:

(i)Aggregate Impact Value (IS:2386 Part 4)One test per 200 cum of aggregateIn situMax. 30%.
(ii)Grading (IS: 2720 Part 4)One test per 100 cum of aggregateIn situAs per Table 400-11 of MOSRT&H Specs
(iii)Flakiness and Elongation Index (IS:2386 Part 1)One test per 200 cum of aggregateIn situMax. 30%
(iv)Atterberg limits of the portion of aggregate passing 425-micron sieve (IS:2720 Part 5)One test per 100 cum of aggregateIn situNot Exceeding (PI) 6%
(v)The density of the compacted layer (IS:2720 Part 8)One test per 500 sqm.

At least 98% of the max. dry density.
(vi)Abrasion value

 

(IS:2386 Part 4)

As requiredIn situMax.  40%
(vii)Fractured FacesAs requiredIn situ90% of material > 4.75 mm size shall have at least 2 fractured faces.
(viii)Water absorptionAs requiredIn situMax.  2%.

 

Soundness test to be conducted in case water absorption is more than 2%.

(ix)Surface Level (MORTH Spec. 902.3)Every 10 m intervalIn situ+ 10mm

3.0

Road Construction  – Tests on Bitumen Materials:

Bitumen is a black, sticky, viscous liquid or semi-solid material derived from crude oil. It is generally found in natural organic deposits or may be a refined petroleum product. Bitumen is the essential road construction materials for flexible pavement.

S.

 

NO.

Type of ConstructionTestLocation Acceptance Criteria
3.1

Prime Coat and Tack Coat:

(i)Quality of binder (IS:73,217 & 8887)Number of samples per lot and tests as per IS:73, IS:217 and IS:8887 as applicableHM PlantBitumen Emulsion complying with IS:8887 of a type and grade as specified in the contract or as directed by Engineer.
(ii)Temp. of the binder for applicationAt the regular close interval

Insitu

(iii)Rate of spread of binderNot less than 2 tests per day; One test per  500 sq.m.Insitu6-9 kg/10 sq.m of liquid bituminous material for a prime coat over the surface of low porosity.

 

2.5-3.0 Kg/10 sq.m. of liquid bituminous material for tack coat.

(iv)Quality of ApplicationAs requiredInsituNo pools

 

No dry spots

Evenly applied

3.2

Dense Bituminous Macadam (DBM) and Bituminous Concrete (BC):

(i)Quality of binder (IS:73,217 & 8887)Number of samples per lot and tests as per IS: 73, IS:217 and IS: 8887 as applicableHM PlantBitumen Emulsion complying with IS:73 of a type and grade as specified in the contract or as directed by Engineer
(ii)Aggregate Impact Value / Los Angles Abrasion Value (IS:2386 Part 4)One test per 50 cum. of aggregateHM PlantAggregate Impact Value

 

DBM 27% max.

BC 24% max

Los Angeles Abrasion Value

DBM 35% max

BC 30% max

(iii)Flakiness Index  & Elongation Index (IS:2386 Part 1)One test per 50 cum. of aggregateHM Plant/stockyardMax. 30%
(iv)Stripping value (IS:6241)Initially one test of 3 representative specimens for each source of supply. Subsequently when warranted by changes in the quality of aggregates.HM Plant/stockyardMinimum retained coating of  Bitumen Aggregate Mixtures 95%
(v)Water absorption of aggregate (IS:2386 Part 3)Initially one test of 3 representative specimens for each source of supply. Subsequently when warranted by changes in the quality of aggregates.HM PlantMax. 2% for DBM

 

Max. 1% for BC

(vi)Soundness (Magnesium and sodium sulphate) (IS:2386 Part 5)Initially, one determination by each method for each source of supply, then as warranted by a change in the quality of the aggregates.HM Plant/stockyardSodiumSulphate

 

12% max.

Magnesium Sulphate          18% max.

(vii)Sand equivalent test for fine aggregate

 

(IS:2720 Part 37)

As requiredHM PlantNot less than 50
(viii)Plasticity Index (IS:2720 Part 5)As requiredHM PlantNot more than 4% for fraction passing 0.425mm sieve
(ix)Stone Polish Test (BS 812  Part – 114)As required, for Bituminous Concrete.HM Plant55 minimum (for BC)
(x)Percentage of fractured faces      (IS:2386 part-I)When gravel is used, one test per 50 cum of aggregate.HM PlantWhen crushed gravel is proposed for use, not less than 90% by weight of the crushed material retained on the 4.75mm sieve shall have at least two fractured faces
(xi)Mix gradingOne set of tests on individual constituents and mixed aggregate from the drier for every 400 tonnes of mix subject to a minimum of two tests per plant per day.HM PlantThe combined grading for the particular mixture shall be within the limits given in Table 500.10 of MORTH, Specs. for R & B. Works when tested in accordance with IS:2386 Part I for DBM & Table 500 – 18 for BC.
(xii)Stability of mixFor every 400 tonnes of mix produced, a set of 3 Marshall specimens to be prepared and tested for stability, flow value, density and void content subject to a minimum of two sets being tested per plant per day.HM PlantAs per Table 500.11 for DBM and Table 500.19 for BC of MORTH Specs for R & B Works.
(xiii)Water sensitivity of mix (Retained tensile strength) – AASHTO  T 283Initially one test of 3 representative specimens for each source of supply. Subsequently when warranted by changes in the quality of aggregates (if required)HM Plant80% min  DBM & BC
(xiv)Swell test on the mixAs required for the Bituminous ConcreteHM PlantRefer Section 6.18 of MS2. Applicable  only to Hveem Method of Mix Design
(xv)Control of the temperature of binder in the boiler, aggregate in the dryer and mix at the time of laying and rolling.

 

MORTH Spec. Clause 501.3 and Table 500-5

At a regular close intervalHM PlantBitumen mixing temp 150-165°C

 

Aggregate mixing temp 150-170°C

Mixed Material 165°C max.

Laying: 125oC min. temp. on Rolling 90°C min.

(xvi)Control of binder content and grading of the mix.One test for every 400 tonnes of mix subject to a minimum of two tests per day per plant. As shown in Table 500-10 for DBM and Table 500-18 for BC of MORTH, Specs for R&B Works.
(xvii)Rate of spread of mixed materialRegular control through checks on the weight of mixed material and layer thickness Hot-mix pant of adequate capacity and capable of yielding a mix of proper and uniform quality with thoroughly coated aggregates.
(xviii)The density of the compacted layerOne test per 700 sq.m area [1.65- {1.65/(no of the sample)^0.5}] times the standard deviationIn situ92% of the theoretical maximum specific gravity of the loose mix (Gmm)
(xix)Coating and stripping of bitumen aggregate mixtures IS:6241.As requiredHM PlantMin 95% coating retained.
(xx)Surface levels

 

(MORTH Spec. 902.3)

As requiredInsitu+  6 mm
3.3

Modified Binder:

(i)Softening point (IS:1205)Initially on submission, thereafter daily if site blended, weekly if preblended.HM PlantAs specified in Table 500-44, 500-45 and 500-46 of MOSRT&H Specs.
(ii)Penetration at 25°C and 4°C

 

(IS: 1203 and IS: 1205 respectively)

Initially on submission, thereafter daily if site blended, weekly if preblended.HM PlantAs specified in Table 500-44, 500-45 and 500-46 of MOSRT&H Specs.
(iii)Elastic Recovery (ASTM D 5976)Initially on submission, thereafter daily if site blended, weekly if preblended.HM PlantAs specified in Table 500-44, 500-45 and 500-46 of MOSRT&H Specs
(iv)Ductility (IS:1208)Initially on submission, thereafter daily if site blended, weekly if preblended.HM PlantAs specified in Table 500-44, 500-45 and 500-46 of MOSRT&H Specs
(v)Flashpoint (IS:1209)Initially on submission, thereafter daily if site blended, weekly if preblended.HM PlantAs specified in Table 500-44, 500-45 and 500-46 of MOSRT&H Specs
(vi)Fraass Breaking Point (IS:9381)Initially on submissionHM PlantAs specified in Table 500-44, 500-45 and 500-46 of MOSRT&H Specs of modifier used.
(vii)Viscosity at 150°C (IS:1206)Initially on submission,HM PlantAs specified in Table 500-44, 500-45 and 500-46 of MOSRT&H Specs
(viii)Thin-film oven test, penetration, softening point, elastic recovery of residue, loss on heating.        (IS: 9382).Initially on submission,HM PlantAs specified in Table 500-44, 500-45 and 500-46 of MOSRT&H Specs

Your Opinion Matters: How easy is it to understand the information on our website?

View Results

Loading ... Loading ...
0
Summary
Road Construction Materials - Test Frequency and Acceptance Criteria
Article Name
Road Construction Materials - Test Frequency and Acceptance Criteria
Description
As per the MORTH technical specification, following Test Frequency and Acceptance Criteria of Road Construction Materials are adapted for Flexible Pavements.
Author
Publisher Name
Construction Civil
Publisher Logo

WhiteHelmet

ConstructionCivil is a learning platform for all the Civil Engineers and Civil Engineering Students throughout the world. I have started this Website to educate and keep people notified by forming a trusted source of knowledge, everything related to Civil/Construction Engineering.
Subscribe
Notify of
guest
0 Comments
Inline Feedbacks
View all comments