# Water Demand (or Specific Surface) of Aggregate as a Dominating Factor for SCC Composition Design
## 6 Conclusions  
The presented results and their analysis allow the following general conclusions to be formulated:  
1. The water demand/specific surface area of aggregate is a key factor determining the content of cement paste necessary to achieve self-compaction ability of concrete.
2. The traditional methods of water demand/specific surface of aggregate assessment ([PERSON], [PERSON]/[PERSON] based, RSS) are also valid in the SCC case and they may be used without any alteration. The best fit was obtained for traditional non-linear water demand models (by [PERSON] and by [PERSON]).
3. The presented method allows to predict paste volume of SCC basing on specific surface/water demand of aggregate and the simple procedure to obtain cement paste of the proper fluidity. The capability to allow prediction of superplasticizer dosage needs further work.
4. The method allows to assess minimum paste demand for any specified range for slump flow, \(t_{500}\), and V-funnel tests.
5. The disadvantage of the described approach is the need to use an arbitrarily determined integrated coefficient containing the total effect of grain shape, unit conversion, model constants, etc. Therefore:  
* The applicability of the model should be limited to a fixed set of component aggregates used to compose the aggregate skeleton.
* The comparability of results between compositions containing aggregate of the same type (e.g., rounded) but of different origin should be considered limited.
* The comparability of results between types of aggregates (rounded/crushed) should be considered questionable.  
**Funding:** This research received no external funding.  
**Institutional Review Board Statement:** Not Applicable  
**Informed Consent Statement:** Not Applicable  
**Data Availability Statement:** All main important data are presented in the study. Any other detailed data are available on request to the corresponding author.  
**Conflicts of Interest:** The author declares no conflicts of interest.  
**Appendix A**  
The Table containing all concrete compositions tested, including slump and viscosity tests results.  
\begin{tabular}{c c c c c c c c c c c c} \hline \hline \begin{tabular}{c} **Component** \\ **Units/** \\ **Composition** \\ **Notation** \\ \end{tabular} & \begin{tabular}{c} **V\({}_{\text{paste}}\)** \\ **cc/m\({}^{3}\)** \\ **cc/m\({}^{3}\)** \\ **cc/m\({}^{3}\)** \\ **cc/m\({}^{3}\)** \\ **cc/m\({}^{3}\)** \\ **cc/m\({}^{3}\)** \\ **cc/m\({}^{3}\)** \\ **cc/m\({}^{3}\)** \\ \end{tabular} & \begin{tabular}{c} **c** **w** & **ad** & **sp** \\ **cc/m\({}^{3}\)** & **cc/m\({}^{3}\)** & **cc/m\({}^{3}\)** & **cc/m\({}^{3}\)** & **cc/m\({}^{3}\)** \\ **cc/m\({}^{3}\)** & **cc/m\({}^{3}\)** \\ \end{tabular} & \
\begin{tabular}{c} **Sand** \\ **Eine** **Se** & **2/8** & **2/16** \\ **kg/m\({}^{3}\)** & **kg/m\({}^{3}\)** \\ \end{tabular} &
\begin{tabular}{c} **D\({}_{0}\)** & **t\({}_{500}\)** & **t\({}_{\text{v}}\)** \\ **cm** & **s** & **s** \\ \end{tabular} \\ \hline
**34A-2** & 350 & 400 & 177 & 120 & 3.5 & 114 & 684 & 866 & 46 & 48 & \\ \hline
**34B-2** & 352 & 402 & 178 & 121 & 3.5 & 24 & 722 & 880 & 79 & 52 & 35 & \\ \hline
**34C-2** & 352 & 402 & 178 & 121 & 3.5 & 0 & 658 & 967 & 81 & 55 & 42 & \\ \hline
**40A-2** & 336 & 352 & 183 & 106 & 2.3 & 116 & 699 & 885 & 47 & 51 & \\ \hline \hline \end{tabular}