SCC is a result of high end research, where exposure of workers to high noise & vibration could be eliminated. It was first used in a road project in Sweden and later on in other parts of Europe in 1990- 1995. Now it's being used in many places. It gives homogeneous product, require less w/c ratio. It can automatically fill the voids even where dense reinforcement is present. Hence chances of porosity is very very less. One can go through the attached paper regarding different aspects:

Dear Harith Sabah Naji 

These links may be helpful

http://leidykla.vgtu.lt/conferences/MBM_2007/1pdf/Szwabowsk.pdf

http://www.tandfonline.com/doi/abs/10.3846/1392-3730.2009.15.137-147

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3976797/

http://www.academia.edu/21408732/Permeability_properties_of_self-Compacting_concrete_with_coarse_recycled_aggregates

Conference Paper Porosity of self-compacting concrete

There is no any limit value for porosity of SCC. Although porosity and pore size distribution affect many main properties in concrete such as compressive strength, density, permeability,  durability and etc., special concretes can be sufficiently produced for any requirement by ignoring the pore properties. Limits given as recommendations in EFNARC (2005) report can be used for satisfactory SCC design.

EFNARC 2005

There is no prescribed or fixed limiting value for porosity in self compacting concrete. Moreover, from the formation point of view, SCC has denser microstructure than normal concrete. Because of the higher amount of filler material and exclusion of vibration, SCC must have a denser interfacial zone and more uniformly dispersed microstructure. 

So, the porosity you will obtained from SCC - is always better and durable. Moreover, to know the guidelines you may go through The European Guidelines for Self-Compacting Concrete which was mentioned by H. Süleyman Gökçe in the above comment.