high strength concrete can be obtained by using a wide variety of mix proportions if proper mix design procedures are used.
recommended mix proportions for high strength concrete?
Thank you very much for replying Sushanta Roy sir. This information of yours is really helpful. Also, thank you very much for your inputs.
Respected Brahma chari sir,
recommended mix design code for high strength concrete https://law.resource.org/pub/in/bis/S03/is.10262.2009.pdf
high strength concrete can be obtained by using a wide variety of mix proportions if proper mix design procedures as per is.10262.2009
Dear Brahma chari sir,
Mix design of high strength concrete is influenced by properties of cement, sand aggregates & water-cement ratio have compressive strength above 40 MPa. To achieve high strength, it is necessary to use lowest possible water-cement ratio, which invariably affects the workability of the mix and necessitates the use of special vibration techniques for proper compaction. In the present state of art, a concrete with a desired 28 day compressive strength of upto 70 MPa can be made with suitably proportioning the ingredients using normal vibration techniques for compacting the concrete mix.
dear sir,
Design a high strength concrete for use in the production of precast prestressed concrete to suit the following requirements:
Specified 28-day works cube strength = 50 MPa
Very good degree of control; control factor = 0.80
Degree of workability = very low
Type of cement = ordinary Portland cement
Type of coarse aggregate = crushed granite (angular) of maximum size 10mm.
Type of fine aggregate = natural sand
Specific gravity of sand = 2.60
Specific gravity of cement = 3.15
Specific gravity of coarse aggregates = 2.50
Fine and coarse aggregates contain 5 and 1 percent moisture respectively and have grading characteristics
Concrete has a greater compressive strength than tensile strength. with an increase in the time it increases its strength. In order to improve the tensile strength and flexural strength reinforcement using various metal and composite networks. In the last 10 years are used particles called fiber, which shape and dimensions are different. They may be metallic and non-metallic most often. Fiber replace reinforcing networks. Putting fiber in it before pouring the concrete mixer. Plates with availability of fiber has higher strength than the old methods of building enclose. A very important parameter is the shape of the fibers and their quantity in concrete. With increase above the optimum amount begins to have a negative effect in reducing the strength of the concrete.
Dear Mr. Brahma Chari J Kanneganti,
Preparation of high strength concrete requires a very low water cement (w/c) ratio. For example: for 80MPa concrete a w/c ratio of as low as 0.23 will be required. Sand to Coarse aggregate ratio around 40% generally results in good quality concrete. However, with low w/c ratio concrete becomes less workable and very difficult to handle. In such condition, self compacting self flowable admixtures can be used.
Thank you very much for replying Velpula Sreelakshmi mam.
Respected Sekhar sir,
Thank you very much for replying. This information of yours is really helpful.
Thank you very much for replying Sushanta Roy sir. This information of yours is really helpful. Also, thank you very much for your inputs.
Dear
High strength concrete could be obtained when using 400-450 kg of cement/cubic meter of concrete with W/C ratio of 0.3 and the cement/sand/aggregate ratios are 1:1.5: 2.5 based on my experience. if superplastisizer is implemented, then the W/C ratio could be further reduced and an early strength could be obtained as well.
Thank you very much for replying Saad Sarsam sir. This information of yours is really helpful. Also, thank you very much for your inputs.
Evening Brahma, What is high strength in your definition? 80 to 120 MPa or close to 200 MPa and what will be the use of this concrete. See research shows that if you really want high strengths you need to use only fine particle all below about 500 microns, secondly you need to use w/c ratios below 0.15, then without Silica Fume you will battle to get close to the 200 MPa. Admixtures are a must and dosages up to 5% were used in some cases. Lastly, you don't even want to try HSC without steel fibers and preferably Micro steel fibers at 2-3% of the mix. Curing is essential at temperatures up to 90 degrees C and cure underwater is required. Timing on when to start heat curing is important and the type of Cement and all the Cement extenders that are used plays another big role. Hope I did not confuse you too much?
Dear Brahma Chari J Kanneganti
Please see this article. May you can find your answer there. best regards.
Respected Derek Mostert sir,
Its really impressed me.Thank you very much for replying This information of yours is really helpful.
Dear Abbas AbdulMajeed Allawi sir,
This information of yours is really helpful.
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