Effect of void fraction on the properties of self compacting mortar system (scm)
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
UMT.Lahore
Abstract
Self-Compacting Cementitious Systems (SCCS) fall in the arena of modern concrete technology which has been used constructively all over the world. Such systems provide uniform compaction and therefore uniform durability and are characterized by higher powder content with a lower w/c ratio compared with conventional concrete. This paper predicts the ratio of fine aggregates and coarse aggregates such that void fraction in the matrix is minimum in self-compacting mortar system (SCMs). The grading and packing of all solids in the concrete mix is the basis for the development of new concrete mixes. Local Margalla coarse aggregates (passing ASTM sieve ½” and retained on sieve 3/8”) and Chenab fine aggregates (passing sieve 30 No. and retained on sieve 50 No.) were taken in different proportions. All the sand/gravel mixes achieve the least void fraction of the mass ratio of sand/gravel between 40/60 to 60/40 (both loose and compacted conduction), within this range combining solids, (Fine and Coarse aggregates) the amount of paste (water, cement) gets reduced to a great extent. Furthermore, the packing behavior of the powders (cement) and aggregates (sand and gravel) used are analyzed in detail. Our work validates the work done by H.J.H. Brouwers *, H.J. Radix, (Cement and Concrete
Research 35 (2005) 2116-2136) even for Pakistani materials.