# Engineering Properties of Colorful Mortar with Inorganic Color Paste
## 4 Conclusions  
1. The slump and slump flow increase with the content of inorganic color paste. The black inorganic color paste has the best fresh properties, the yellow inorganic color paste takes second place, and the other colors have insignificant differences.
2. The compressive strength decreases as the content of inorganic color paste increases, meaning a high content of inorganic color paste has negative influence on hardened properties. The addition of polyacrylic emulsion can reduce the specimen compactness, and the hardened properties degrade accordingly. The yellow inorganic color paste is the most effective on compressive strength; the compressive strength exceeds the control group when the content is 5%. The green inorganic color paste is the least effective on compressive strength.
3. The flexural strength and tensile strength decrease as the content of inorganic color paste increases. The polyacrylic emulsion can improve the flexural strength and tensile strength of mortar. The strengths increase at later ages, and even exceed the control group.
4. The ultrasonic pulse velocity increases with age. The ultrasonic pulse velocity of colorful mortar with inorganic color paste is lower than the control group. Because the polyacrylic emulsion reduces the specimen compactness, the ultrasonic pulse velocity is lower than 4400 m/s. The content 5% of yellow inorganic color paste has the highest ultrasonic pulse velocity (4321.33 m/s), the content 15% of green inorganic color paste has the lowest ultrasonic pulse velocity (3750.33 m/s).
5. The resistivity decreases as the content of inorganic color paste increases. The trend of resistivity is different from the ultrasonic pulse velocity at late age. As the specimen shall be wet in quadrupole-type resistance measurement, the curing environment of this experiment is atmosphere, the specimen is too dry, and the measured resistivity is too high.
6. The thermal conductivity and length change decrease as the content of inorganic color paste increases. The addition of polyacrylic emulsion results in pores in the specimen, so that the thermal conductivity decreases. Various colors have insignificant  
Figure 11: W/C 0.4 Shrinkage of mortar with different proportions of inorganic color paste.  
differences in length change. There is no significant difference between the length change and the control group.
* The addition of inorganic color paste will slightly reduce the hardening properties of the colored cement mortar, but the addition of 5% inorganic color paste can effectively improve the properties of the fresh mix. In this study, adding 20% PolyAcrylic Emulsion can improve the engineering properties (flexural strength, tensile strength) and durability of the colored cement mortar, and achieve the advantages of workability, durability and aesthetics.  
Resources, J.-M.H.; writing--original draft preparation, T.-C.K.; writing--review and editing, H.-Y.W; project administration, W.-D.Y. All authors have read and agreed to the published version of the manuscript.  
This research was funded by Ministry of Science and Technology, grant number 109-2622-E-992-005-CC3.  
The authors declare no conflict of interest.