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No-Fines Concrete

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No-Fines Concrete

 

The no-fines concrete consists of cement, coarse aggregate and water. Thus the fine aggregate or sand is eliminated and such concrete has been adopted for cast-in-situ external load bearing walls of single and multi-storey houses, small retaining walls, damp-proofing sub-base material, etc.

Following are the advantages of no-fines concrete:

(1) As compared to the conventional concrete, the drying shrinkage of no-fines concrete is relatively low.

(2) As there is absence of capillary passages, there is no transmission of water by capillary action.

(3) It is a type of lightweight concrete and hence it grants the advantages associated with the lightweight concrete construction.

(4) It possesses better insulating characteristics than conventional concrete because of the presence of large voids.

(5) There is direct saving in material requirements as this concrete does not require sand which results in considerable saving of cement per m3 of concrete.

(6) The unit weight of no-fines concrete is bout two-thirds of the unit weight of conventional concrete. Hence the pressure on formwork is greatly reduced. Also the form work need not be watertight and hence it is possible to use cheap formwork.

(7) As no-fines concrete does not segregate, it can be dropped from a considerable height and placed in very high lifts.

Following are however the limitations of the no-fines concrete:

(1) As no-fines concrete has little or no cohesion in the fresh state, it requires long time for the removal of forms.

(2) It is highly permeable as compared to the conventional concrete and hence the rendering of walls becomes essential. However in certain case, such as drainage layers in soils, the advantage of qua

 
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