Dear Saurabh, please see this article

Data Role of water cement ratio on the cement mortar

Dear Saurabh,

ASTM specifications recommended mix proportion in the beginning was 1:2.75, and w/c equal to 0.5 for normal mortar, and 0.46 when adding entertaining admixtures, w/c will decrease or increase according to ambient temperature and relative humidity. So to determine the optimum w/c you should check flow table test. Flow ability must 110+_ 5 mm.

I will attaching you ASTM specifications may be helpful.

Good Luck

You must do expermental mixtures with different w/c ratio for every variable (percentage of fiber as example ) and make consistency test for mortar to know the right w/c ratio

Use previous mixed designs of similar cases as references. Try to make your own mix-design and test it to get the results.

Every material has different properties.

Sorry this subject out of my Experience

fibres will effect the flowability. should do trial mixes with the higher volume fraction of fibre

What is definition of Flow ? Can any one Define it in very clear words. it is very confusing. Doha M Al Saffar

U may check the BS EN 196-2 for mortar fabrication and BSEN 197-1 for mortar specifications

here are the files

use superplasticizer instead of increasing water content.

Begin with 1:2.75, and w/c equal to 0.5 for normal mortar then see the compressive strength

according to the results of compressive strength and flow test increase or decrease the w/c ratio or reduce the sand content all that depend on the required compressive strength

you need a number of trial mixes to reach to required compressive strength

if you want compressive strength more than 35 MPa, using SP with 1:2 ratio and 0.4 w/c ratio

if you used fibers, the required w/c ratio will increased

see this articles

Article Influence of aggregates grading and water/cement ratio in wo...

First, the type of fiber should be defined, glass fiber, steel fiber...etc. The mix properties is significantly variable based on fiber type and properties. However, it is recommended to do some try mixes with different ratio of fiber and W/C ratio. also using superplasticizer is highly recommended with this type of mixtures to reduce water and increase the flowability of the mix. @Saurabh Khandelwal

Regards

I agree with Sheelan Hama. I designed my mortar using the ASTM standard with modifications to get the target compressive strength. If you need a benchmark mortar mix design to start with, refer to the publication below. I have compiled the mortar mix design in a table.

Article Improving the Performance of Lightweight Crumb Rubber Mortar...

According to ASTM C452, the aggregate to cementitious material ratio is set at 2.75, and the water-to-cementitious material ratio (W/CM) is 0.485. For the standard mortar composition, the weight ratio of the components is one part cement to 2.75 parts of graded standard sand. A water-cement ratio of 0.460 is recommended for use with all air-entraining Portland cements, while a ratio of 0.485 is advised for all other cement types.