A case study of the effect of different amounts of Nano clay on the characteristics of composite mortars containing Nano silica and polypropylene Fibers

In recent years, there have been many studies on the benefits of using nano materials in concrete. Inthe meantime, there are fewer resources that deal with the effect of nano clay and its combined use withnano silica and polypropylene Fibers in concrete. In this article, in the first step, ۳ standard mortar sampleswere made, one sample without nano materials and super-lubricant additives, one sample with ۰.۴% superlubricantadditives, and one sample with ۰.۴% super-lubricant additives and ۱.۵% nano silica. In the secondstep, using amounts of ۰%, ۱.۵%, ۳%, ۴.۵%, ۶%, ۷.۵%, and ۹% of nano clay, ۱.۵% of nano silica, ۰.۵% ofshort polypropylene Fibers, and ۰.۴% of super fluidic additives to prepare seven standard mortars. and inthe third step, seven more mortars were made with the same amounts as in the second step and only bychanging the amount of Fibers to ۱%. The flow test was performed on all ۱۷ standard mortar samples, andthree prismatic specimens were prepared from each mortar to determine the compressive and bendingstrength for the ages of ۷, ۲۸, and ۹۰ days. The results showed that the fluidity of the mortar decreases withthe increase of the amount of nano clay; In mortars with ۱% Fibers, samples containing ۳-۴.۵% nano clay,and in mortars with ۰.۵% Fibers, samples containing ۳% nano clay showed the highest compressivestrength.

کلیدواژه ها:

Polypropylene Fibers ، nano clay ، nano silica ، cement ، compressive strength ، bendingstrength ، density.