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Indian Roads Congress
Special Publication 49
GUIDELINES FOR THE
USE OF DRY LEAN
CONCRETE AS SUB-BASE
FOR RIGID PAVEMENT
Published by
THE INDIAN ROADS CONGRESS
Copies can be hadfrom
The Secretary, Indian Roads Congress,
Jamnagar House, Shahjahan Road,
New Deihi-ilOOll
NEW DELHI 1998 Price Rs. 60/-
(plus packing and
postage)
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JRC:SP:49~1998
First published October, 1998
(!?~ghtsof Publication and of Translation are reserved)
Printed at Sagar Printers & Publishers, New Delhi-Il 0(XJ3
(10(X) copies)
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IRC:SP:49— 1998
MEMBERS OF THE HIGHWAYS SPECIFICATIONS AND
STANI)ARDS COMMITTEE
(As on 4.11.97)
I Sin A.I) Narain * Director General (Road Dcv.) & AddI. Secy. to the Govt.
(Pons’enor ofIndia, Ministry of Surface Transport (Roads Wing),
Transport Bhavan, NEW DELHI-I 10001
2 .Shri Indu Prakash Chief Engineer (R). S&R
Member-Secretary) Ministry of Surface Transport (Roads Wing).
Transport Bhavan ,NEW DELHI-I 1(XX)I
3, Shri i.E. Mathur ChiefEngineer (Planning)
Ministry of Surface Transport (Roads Wing),
Transport Bhavan, NEW DELHI-Il0001
4 ShriNirrnal ut Singh ChiefEngineer (T&T)
Ministry of SurfaceTransport, (Roads Wing),
Transport Bhavan, NEW DELHI- 110001
S. Prof. Gopal Ranjan Pro Vice Chanceller & Prof. of Civil Engg.,
University of Roorkee, RDORKEE-247667
6 Dr AK. Gupta i)irector, Central Road Res.Institote, P.O. CRRI,
Delhi-Mathura Road, NEW DELHI-i 0020
.7 Dr. 1... R Kadiyali Chief Consultant, Dr.L.R. Kadiyali & Associates,
S-487, lIndFlooi~Greater Kailash-l, NEW DELHI-45
5, Maj.G~n.CT. Chari Director General (Works), Engineer-in-Chief’s
Branch, Amsy Hqrs., Kashn7ir House, i)HQ P.O.,
NEW I)ELH1-l 10011
0 Shri H.P. Jarndar Secretary to the Govt. of Gu~arat,R&B Department,
Sardar Bhavan, Block No. 14, Sachivalaya,
GANDHINAGAR-3820 10
0 Shri PD. Wani Secretary (Works), Public Works Department,
Mantra]aya, MUMBAI-400032
1! .Shri S.C. Shanna Chief Engineer,
Ministry ofSurface Transport (Roads Wing),
Transport Bhavan NEW DELHI-I 10001
2. Shri. MV. Patil Secretary, P.W.D., Mantralaya, MUMBAI-40(X132
13 Maj . CR. Rainesh Secretary to the Govt. of Kansataka P.W.D.,
Room No. 610,6th Floor, Multistoried Building,
Dr. Anibcdkar Road, BANGALOR.E-5600)t I
* ADG)R) being not in position. the meeting was presided by Shra AD. Narain,
DG(RD), Govt. of india, MOST
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IRC:SP:49- 1998
14 Shri iC. Bhandari ChiefEngineer (Mech.)
Ministry of Surface Transport (Roads Wing),
Transport BhavanNEW DELHI-I 10001
15. ShriP,K,Sah Dy. Director General (Design & Specification Cell)
Directorate General Border Roads, Kashmir House,
DHQ P.O. NEW DELHI-I 10011
16. Prof. AK. Sharnia Head of Depti. ofTransport Planning,
School of Planning & Architecture, 4, Block B,
I.P. Estate, NEW DELHI-I 10002
7 Shri OP. Agat~’ala ChiefEngineer (B) S&R
Ministry of Surface Transport, (Roads Wing),
Transport Bhavan, NEW DELHI-I 10001
IS. Shri V. Murahari Reddy Engineer-in-Chief, R&B Department, A&E,
Errum Man:zil, HYDERABAD-500082
19. Stir) K.B.LaI Singhai Engineer.4n.Chief, Haryana Public Works Deptt.,
B&R, Sector 19-B, CHANDIGARH-1600l9
20. Shri S.C. Pandey Chief Engineer (NH), MP. Public Works
Department, ~D’Wing, 1st Floor, Satpura Bhavan,
BHOPAL-462004 (Madhya Pradesh)
2!. Shri Pt). Agarwal Chief Engineer (National Highways), U.P. Public
Works Department. 3, PWD Quarters, Kabir Marg,
Clay Square, LUCKNOW-226001
22. ,Shri R.K. Sharma Engineer-in-Chief, Public Works Department,
U.S. Club, SHIMLA-17 1001
23. Shri E).N. Banerjee The Engineer-in-Chief& Ex-Officio Secy.,
Public Works Department, G Block (2nd Floor),
Writers’ Buildings, CALCU1’TA-700001
24. Shri R.L. Koul Member National Highway Authority of India,
1, Eastern Avenue, Ma}iarani Bagh,
NEW DELHI-I 10065
25. Shri KB. Rajoria Engineer-in-Chief, PW[) Zone I, Govt. of Delhi
KG. Marg, NEW DELHI-I 10001
26. Shri Vinod Kumar Director & Head, Civil Engg. Department,
Bureau of Indian Standards, Manak Bhavan,
9, Bahadur Shah Zafar Marg, NEW DELHI- 110002
27. Prof. G.V. Rao Deptt. of Civil Engg., LIT., Delhi Hauz Khas,
NEW DELHI-I 10016
2S. Dr. OP. Bhatia Dy. Director & Head, Civil Engg. Department,
G.S.IT.S., H-55, M.I.G., INDORE-452008
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IRC:SP:49-1998
29 Sod D.P. Gupta DG(RD), MOST (Retd.) E-44,
GreaterKailash (Part I) Enclave, NEW DELHI-I 10(148
3)) Shri K.K. Sarin DG(RD), MOST (Retd.), S-l08, Panchshila Park,
NEW DELHI-I 10017
3! Prof. C.G Swaminathan ‘Badri’, 50, Thiruvangadarn Street, R.A. Puram,
CHENNAI-600028
32. Prof (‘E.G. insto Emeritus Fellow 334, 25th Cross, 14th Main,
Banashankari 2nd Stage, BANGALORE-560070
33 Prof. N. Ranganathan Head of Deptt. ofTransportation P1g.,SPA(Retd.)
Consultant, 458/C/SFS, Shaikh Sarai I,
NEWDELHI-l 10017
34. Shri M.K. Agarwal Engineer-in-Chief (Retd.), House No.40, Sector 16,
PANCHKULA- 134109
35. 1)r. AK. Bhatnagar Executive Director, Indian Oil Corporation Ltd.,
(R&D Centre), Sector- 13, FARIDABAD-121007
36. The ChiefEngineer National Highway, AssamPublic Works Department,
Dispur, GUWAHATI-78 1006
37 The Director Highways Research Station, 76, Sarthat Patel Road,
CHENNAI-600025
:ts. The President HP. iamdar, - Ex-Officio
Indian Roads Congress Secretary to the Govt. of Gujarat,
R&B Department, Gandhinagar
39. The Director General Ministry ofSurface Transport - Ex-Officio
(Road t)evelopment), (Roads Wing), New Delhi
AD, Narain’(,
40. The Secretary (S.C. Sharma), - Ex-Officio
Indian Roads Congress Chief Engineer, MOST
CORRESPONDING MEMBERS
I Dr. Yudhhir House No. 642, lIT Campus. P.O. liT, KANPUR-2080 16
2, Dr. V.M. Sharma Consultant, AIMIL, A-S. Mohan Cooperative Industrial
Estate, Naimex House, Mathura Road, NEW DELHI.44
3. Dr. S. Raghava Chari Emeritus Professor JNTU, H,No. 16-11-20/5/5,
Dilsukhnagar-3, HYDERABAD-500036
4. Stir) NV. Merani Past President, IRC, A-47/1 344, Adarshnagar,
Worli, Mumbai-400025
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I1tC:SP:49- 1998
CONTENTS
Page No.
I. Introduction
2. Width and Thickness of DLC Sub-base 2
3. Materials 2
4. Pmportioning o(Mataials for the Mix 4
5. Subgrade 5
6. Construction 5
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IRC:SP:49-1998
GUIDELINES FOR THE
USE OF DRY LEAN CONCRETE AS
SUB-BASE FOR RIGID PAVEMENT
L INTRODUCTtON
1. The draft Guidelines for the use of Dry Lean Concrete as
~ub~basefor Rigid Pavements prepared by sonic members of the newly
constituted committee of Rigid Pavement Committee (H-5) was discussed
during the first meeting held on 1.9.97 (personnel given below), The draft
was finalised after incorporating certain changes and modifications
suggested by the members of the Committee.
Dr. L.R. Kadiyali Convenor
CE(NH) & it. Secretary - Co-Convenor
(SI. Patel)
M.C. Veukatesha Member-Secretary
MEMBERS
H.S. Bhatia K.N. Rai
Sudesh Dhiman Dr. S.S. Seehra
R.K. lain Arun Kumar Sharrna
Dr. C.E.G. Justo Brajendra Singh
I)r. S.C. Maiti V.K. Sinha
S.S. Momin Dr. R.M. Vasan
B.V.B. Pai CE(R), Municipal Corporation of
YR. Phull Greater Bombay
Director, HRS, Chennai
EX-OFFICIO MEMBERS
President. IRC. DG(RD), MOST
(H.P. Jamdar), (AD. Narain),
Secretary, IRC
(S.C. Sharma)
CORRESPONDING MEMBER
Kanti Bhushan Bhaumik Dr. J.N. Mandal
H.K. Kulshrestha S.M. Sabnis
Prof. D.A. Shastry
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IRC:SP:49-1998
‘[‘he guidelines were discussed and approved b~Highway
Specifications & Standards Committee iti its meeting held on 4. 1.97, The
gutdelities were approved by the Executive Committee and the Council in
their meetings held on 29.1 1.97 and on 5.1,98 respectively.
1.2. The provision of a sub-base below the concrete pavements has
many advantages such as prevention of pumping, availability of a firm
slruclural support fot construction equipment and enhancing the pavement
performance under frost conditions. The cement-bound sub-base is one of
the commonly adopted materials because of a wide variety of accruing
benefits. ‘These include provision of a uniform and strong support; high
resistance to deformation and frost action; prevention of pumping; control
of volume changes in expansive soils; and improved load transfer at
pavement ~oLnts.Some design practices take advantage of the provision of
cement-treated sub-bases in recommending a higher soil support value.
Dry Lean Concrete (DLC) is one of the most popular cement treated
sub- bases,
The guidelines given here cover all aspects ofconstruction ofDLC
sub-base.
2. WIDTH AND THICKNESS OF DLC SUB-BASE
The i)LC sub-base shall extend beyond the pavementedges by So
cm to facilitate further construction operations and provide an adequate
support for the concrete slab. The extra width facilitates the retrieval and
reuse of concrete that collects outside the paver.
A thickness of 100mm or 150 mm is commonly followed, though
a thickness of I 5() mm is recommended for all major projects. Actual
thickness will be governed by design considerations.
3. MATERIALS
Cement:Any of the following types of cement may be used with
prt or approval of the engineer:
1) Ordinary Portland Cement IS: 269.8112 and 12269
it) Portland Slag Cement IS: 455
iii) Portland Pozzolana Cement IS: 1489
If the suhgrade is found to consist of soluble suiphates in a
concentration more than 0.5 per cent, the cement used shall be sulphate
reststant and shall conform to IS:6909.
2
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IRC:SP:49- 1998
Aggregates:Aggregates for lean concrete shall be natural material
complying with IS:383. The aggregates shall not be alkali reactive, The
limits of deleterious materials shall not exceed the requirements set out in
IS: 383. In case the aggregates are not free from dirt, the same may be
washed and drained for at least 72 hours before batching.
Coarse aggregate shall consist of clean, hard, strong, dense,
non-porous and durable pieces of crushed stone or gravel and shall be
devoid of pieces of disintegrated stone, soft, flaky, elongated, very angular
or splintery pieces. The maximum size of the coarse aggregate shall he
25mm. The water absorption in the aggregates shaH not exceed 2 per cent.
The fine aggregate shall consist of clean, natural sand or crushed
stone sand or a combination of the two and shall conform to IS:383. Fine
aggregate shall be free from soft particles, clay, shale, loam, cemented
particles, mica, organic and other foreign matter.
The coarse and fine aggregates may be obtained in either of the
following manner:
i) In separate nominal sizes ofcoarse and fine aggregates and mixed
together intimately before use
ii) Separately as 25 mm nominal single size, 12.5 mm nominal size
graded aggregates and fine aggregate of crushed stone dust or
sand or combination of these two
The material after blending shall conform to the grading as
indicated, Table I.
TABLE I: Aggregate Gradation for Dry Lean Concrete
Sive Designation Percentage passisng the sieve by
weight
26.50mm 100
19.00mm 80-100
9.50 mm 55-75
4.75 mm 35-60
600 micron 10-35
75 micron 0-8
Water used for mixing and curing of concrete shall be clean and
free from injurious amounts of oil, salt, acid, vegetable matter or other
substances harmful to the finished concrete. It shall meet the requirements
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