# Engineering Properties of Colorful Mortar with Inorganic Color Paste
## 3 Results and Discussion
The results show that the compressive strengths of the three inorganic color pastes decrease as the content increases. The compressive strength of mortar with 5% inorganic color paste is close to the control group, and the yellow inorganic color paste is the closest to the control group. The 5% inorganic color paste has less effect on the compressive strength of mortar, the contents 10% and 15% have relatively significant effect. It is because higher content of inorganic color paste influences the water-cement ratio more significantly. Figure 4: Slump flow of mortar with different proportions of inorganic color paste. Figure 5: W/C 0.4 Compressive strength of mortar with different proportions of inorganic color paste. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**AM (\%)**} & \multicolumn{5}{c}{**Age (Days)**} & \multicolumn{2}{c}{**Unit: MPa**} \\ \cline{2-10}
**Color** & \
\begin{tabular}{c} **PolyAcrplusion** \\ \end{tabular} &
\begin{tabular}{c} **Color** \\ **Paste** \\ \end{tabular} & **3** & **7** & **28** & **56** & **91** & **120** \\ \hline Control & 0 & 0 & 33.81 & 34.48 & 38.57 & 39.04 & 39.57 & 41.2 \\ \hline \multirow{3}{*}{Red} & \multirow{3}{*}{20} & 5 & 16.74 & 22.06 & 31.14 & 37.91 & 39.03 & 41.32 \\  & & 10 & 15.97 & 21.5 & 26.75 & 36.57 & 37.53 & 38.36 \\  & & 15 & 14.66 & 17.92 & 23.21 & 33.62 & 36.45 & 37.52 \\ \hline \multirow{3}{*}{Yellow} & \multirow{3}{*}{20} & 5 & 18.63 & 27.12 & 34.31 & 40.22 & 40.98 & 42.47 \\  & & 10 & 15.81 & 26.93 & 33.54 & 38.36 & 39.67 & 40.92 \\  & & 15 & 14.24 & 24.52 & 33.15 & 36.37 & 37.09 & 39.42 \\ \hline \multirow{3}{*}{Green} & \multirow{3}{*}{20} & 5 & 16.04 & 21.05 & 26.99 & 30.63 & 32.98 & 35.52 \\  & & 10 & 14.41 & 18.52 & 23.99 & 28.62 & 32.45 & 34.67 \\  & & 15 & 12.45 & 15.65 & 22.09 & 23.96 & 28.78 & 30.32 \\ \hline \multirow{3}{*}{Blue} & \multirow{3}{*}{20} & 5 & 15.74 & 22.55 & 29.26 & 33.25 & 35.76 & 41.03 \\  & & 10 & 15.17 & 21.44 & 26.67 & 31.41 & 33.69 & 35.16 \\  & & 15 & 14.13 & 20.39 & 25.17 & 28.89 & 31.97 & 33.2 \\ \hline \multirow{3}{*}{White} & \multirow{3}{*}{20} & 5 & 17.2 & 21.91 & 28.99 & 34.8 & 34.87 & 37.79 \\  & & 10 & 16.16 & 21.29 & 27.94 & 33.9 & 34.18 & 36.99 \\  & & 15 & 14.48 & 21.24 & 26.36 & 32.82 & 33.37 & 36.61 \\ \hline \multirow{3}{*}{Black} & \multirow{3}{*}{20} & 5 & 16.71 & 21.89 & 31.74 & 35.41 & 38.24 & 40.46 \\  & & 10 & 14.68 & 21.18 & 30.68 & 32.63 & 36.57 & 39.09 \\  & & 15 & 14.27 & 17.93 & 29.08 & 30.29 & 31.09 & 32.7 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Compressive strength of mortar with different proportions of polyacrylic emulsion and inorganic color paste. (4) Flexural strength  
As shown in Figure 6, the flexural strength of colorful mortar increases with age. At the age of 28 days, when the content of inorganic color paste increases from 5% to 15%, the flexural strength decreases from 10.3-13.0 MPa to 8.9-11.5 MPa, meaning the addition of inorganic color paste can influence the flexural strength of mortar. When the content of inorganic color paste is 5%, the flexural strength of colorful mortar is higher than the control group by 0.6-1.1 MPa at the age of 56 days; that of blue inorganic color paste is lower than the control group by 0.2-4.2 MPa at all ages, meaning the blue inorganic color paste has relatively significant influence on flexural strength. As the content of inorganic color paste increases to 15%, the flexural strength of colorful mortar other than white inorganic color paste only approaches the control group, while the flexural strength of white inorganic color paste is higher than the control group by 0.1 MPa at the age of 120 days, meaning the content 15% of inorganic color paste has relatively significant influence on flexural strength, and the white inorganic color paste can effectively enhance flexural strength at a late age. The addition of polyacrylic emulsion to colorful mortar can effectively enhance the flexural strength, and the property is better than compressive strength.