due to weak tensile strength of concrete ,it can't stand long as after repairing. i want to make a concrete which has enough tensile strength to withstand as repairing.
The increase in tensile strength in concrete depends mainly on the connection between the components of the all mixtures and the cement-bonding material. As for increasing the tension by aggregate, it can be increased by increasing the compressive strength, which will in turn increase the tension in an indirect way by reducing the nominal size of the aggregate and with a rough surface.
Dear Haque,
We know that concrete is weak in tension, and also we don't have any machine which directly measures theTensile strength of concrete, we are just performing the indirect form i.e split tensile strength of concrete, inorder to increase the tensile strength of concrete we have to add fiber either as Natural or synthetic fibres to enhance the bonding property. Generally, synthetic fibres such as GLASS fibers is used major because it shows higher tensile strength in concrete when compared with all other types of fibers.
With the existing materials, I believe you cannot observe significant changes in the tensile strength of concrete. If your limitation is to focus on the aggregates only, then focus on getting higher compressive strength which might result in a small increase in tensile/rupture strength. Alternatively, if you can change the composition, then try out fibers (carbon or glass) + high strength concrete materials replacing a part of your fine aggregate.
Limeted changes in tensile strength by changing mix proportions , so you need to add fibers to improve tensile strength
Bala Murali Thank you sir for your kind information. Now would you please tell me how can i use those fibers i mean the procedure of using fibers. You can suggest me any link or paper regarding this..
Witam
sporo czasu poświęciłem na badania zwiększenia wytrzymałości na rozciąganie przy zginaniu i mam następujące wnioski:
- wytrzymałość jest większa jeżeli zwiększamy uziarnienie (jamistość) wewnętrzna była jak najmniejsza,
- można zmniejszyć w/c i wprowadzić super-plastyfikator zwiększający adhezje zaczynu do cementu,
- dodatkowo warto zastosować włókno polipropylenowe jako mikrozbrojenie betonu (0,7 kg na 1 m3)
Tomasz Rudnicki Thank you Sir. lots of information. i will try according to your direction
- najlepsze wyniki uzyskiwałem gdy kruszywo było nie do 16 a do 32 mm,
- szczelność upakowania stosu kruszywowego powoduje lepszą szczelność i tworzy tzw. zamek kruszywowy
- dodatkowo włókna poprawią ok 1 - 1,5 MPa na zginanie
tomek
Article Laboratory Creep Parameter Determination of Sand–TDA Mixture...
Thanks to all the above answers which emphasis the limitations in improvement of tensile strength of concrete with the conventional materials, I recommend you to look for some innovative materials such as Tire Derived Aggregates (TDA) (a by-product of Scrap Automobile Tire) to be added to the concrete mixture as a suitable alternatives to the conventional aggregates currently used in production of concrete, specially in order to produce Lightweight Concrete with a High Level of Tensile Strength.
Please check my recent publication provided at the top of this comment to find out more about the TDA, its characteristics and its application as civil engineering material.
Anamul Haque Tomasz Rudnicki Rana Burhan Alshahwany Chaitanya Krishna Bala Murali Aymen J Alsaad
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