Guidelines for Dry lean Concrete construction|DLC construction technical specifications
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- Опубліковано 4 жов 2019
- #dlcroadwork#dryleanconcrete
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DLC or Dry Lean Concrete is cement concrete with low slump value to be laid for rigid pavement over sub-base and rolled & compacted by mechanical means.
· Ordinary Portland cement, Portland PozzolanaCementor Portland Slag Cement be used for DLC.
· Coarse aggregate shall consist of Clean, hard, strong, dense, non-porous and durable pieces of crushed stone or crushed 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 be 25 mm.
· 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 of coarse 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 a combination of these two
Water 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.
· The mix shall be proportioned with a maximum aggregate cement ratio of 14: 1.
· The minimum cement content is 140 kg/cu.m. of concrete.
The average compressive strength of each consecutive group of 5 cubes made shall not be less than 10 MPa at 7 days. In addition, the minimum compressive strength of any individual cube shall not be less than 7.5 MPa at 7 days.
The batching plant shall be capable of proportioning the materials by weight, each type of material being weighed separately. The cement from the bulk stock shall be weighed separately from the aggregates. The batching and mixing shall be carried out preferably in a forced action central batching and mixing plant having necessary automatic controls to ensure accurate proportioning and mixing. Other types of mixers shall be permitted subject to demonstration of their satisfactory performance during the trial length. The type and capacity of the plant shall be got approved by the Engineer before commencement of the trial length. The (weighing balances shall be calibrated by weighing the aggregates, cement, water and admixtures physically either by weighing with large weighing machine or in a weigh bridge. The accuracy of weighing scales of the batching plant shall be within ± 2 per cent in the case of aggregates and ±1 per cent in the case of cement and water.
Plant mix lean concrete shall be discharged immediately from the mixer, transported directly to the point where it is to be laid and protected from the weather by covering the tippers/ dumpers with tarpaulin during transit. The concrete shall be transported by tipping trucks, sufficient in number to ensure a continuous supply of material to feed the laying equipment to work at a uniform speed and in an uninterrupted manner. The lead of the batching plant to paving site shall be such that the travel time available from mixing to paving.
Lean concrete shall be laid/placed mechanically /manually. The concrete shall be laid in one layer in an even manner without segregation, so that after compaction the total thickness is as specified. The laying of the two- lane road sub-base may be done either in full width or lane by lane. Preferably the lean concrete shall be placed and compacted across the full width of the road, by constructing it in one go or in two lanes running forward simultaneously.
Rolling & Compaction; Spreading of DLC· The compaction shall be carried out immediately after the material is laid and leveled with 8 -10 Tonne Static Roller. In order to ensure thorough compaction which is essential, rolling shall be continued on the full width till there is no further visible movement under the roller and the surface is closed.
As soon as the lean concrete surface is compacted, curing shall commence. Curing shall be done by covering the surface by gunny bags/hessian, which shall be kept continuously moist for 7 days by sprinkling water.
· The minimum dry density obtained shall be 97% of the dry density achieved during trial length construction and the density achieved at the edges (i.e. upto 0.5m from the edge) shall be not less than 95% of the MDD - Наука та технологія
Excellent
Nice information sir.
Thanks
Thnk u
Good Sir je
Hello,
Can you clear 1 confusion.
You have said in another comment that the water content has to be taken as a percentage of total weight. Does this total weight include the weight of aggregate(coarse+fine) and the weight of cement?
For example, if PPC is used then we will have 140 kg cement, 140 x12 = 1680 kg aggregates and for 5.0% water content we will have 5% x (140+1680) = 91 kg of water.
Now I have a bigger question, what will be the volume of concrete obtained with these weights (140 kg cement, 1680 kg aggregate, and 91 kg water). Would it be 1 cubic meter?
Yes all mass like aggriagte + cement only we should consider
Brother we are dealing with concrete density nor cement or aggregate density
Very good
Thanks my brother
Sir general major district road ke liye DLC ke liye mix ratio kya lete hai
PSC cement use kar sakte hain kya
How will we consider moisture content to find OMC and MDD.
To total material or only with cement
Total material weight
Nice information sir.. also make this type of video for PQC..
Sure friend
Sir,According to morth minimum field density - 98% ,,,96% 0.5 m away from edge.
Yes correct
Mujhko sirf 2mtr width main hi DLC karna hai.us par rolling ka tariqa batayen, please
Plate vibrator ya baby roller use kar skte he ...kam width I liye...ya phir open land h to simple tendome roller use kijiye
Plate compactor use Karo brother
How to find out GSB quantity in road?
ua-cam.com/video/psWkt2GTLCE/v-deo.html this video may help u...
Let's Road :-
Length :- 100.0 meters
Width :- 7.0 meters
Height:- 0.150 meter
Than
Length ×width×height ×density of material
Given that :- 100.0×7.0×0.150×2.290
Material :- 240. 45 MT
LXBxDxMDD
Ex 100m3
Then your dummber capacity be 15 ton so
100/15 = no of loads required
Rolling kitane pass marna hai
Bhai a na calculation karna padega will tell you soon
Bhai 750 mm dono side extra width provide krte h or paver ke liye 150 mm for example agar 9m Ka pqc h to 9+.75+.75+.15+.15=10.8 m Hoga morth ke according bool rha hu so information Sahi kr lo bro
Bhai apki bat sahi he...But is video ko Mene As per IRC SP 49 1998 ke according banaya tha...isliye possible he ye information update nahi ho...thankyou..for remind
Koi nhi bhai wese aacha Lagta h tumhara video meko v good job
Thank you gentlemen
Sir please ogl ki sampling pe vedio banao
This week done
@@HIGHWAYENGINEERING thanks sir
My doubt be come cleared sr
By this video
Road Marking Service
compaction should be 98%
No clear concept from your lecture like a political leaders make sense. It all has been in books. You must have demonstrate by doing these on road where the work is going. Your lecture does not make any sense to any one. It is like a teacher in school without clear concept himself,be fooling the students and killing their time. Demonstrate at work site.
Give insight view of grading etc. Don't kill unnecessarily time of viewers. Stop it right now.
Thanks to report.. this may happened some videos are not good as you want...it not mean that's my channel is Waste..
All Have books...but you also know how many read with Sincerely
If u really want to Correct me kindly write to me mistakes which I make in this video
I have already given suggestion. Now there is no need to elaborate it.
Explanation with demo
Do you understand the meaning of wasting time. Don't waste other man time for a short gain. Go further as I have suggested. Thanks for your quick response.