Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment
Applying a concrete surface treatment method (epoxy or primer) can prevent water from penetrating concrete through surface pores. However, if the concrete surface is damaged, the subsequent reconstruction can be expensive and time-consuming. Concrete that is resistant to internal and external water...
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MDPI AG
2022-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/16/5762 |
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| author | Jang-Hyun Park Chang-Bok Yoon |
| author_facet | Jang-Hyun Park Chang-Bok Yoon |
| author_sort | Jang-Hyun Park |
| collection | DOAJ |
| description | Applying a concrete surface treatment method (epoxy or primer) can prevent water from penetrating concrete through surface pores. However, if the concrete surface is damaged, the subsequent reconstruction can be expensive and time-consuming. Concrete that is resistant to internal and external water has been extensively developed and used to supplement the surface treatment method. Herein, we prepared specimens by mixing cement mortar with fatty-acid-salt-based calcium stearate attached to two natural pozzolanic materials—diatomite and yellow clay. The physical tests measured (1) the air content, (2) flow test, (3) compressive strength, and (4) activity Factor. Durability experiments were performed on (1) the contact angle, (2) chloride ion diffusion coefficient, and (3) water absorption test. The results revealed that the compressive strength of concrete decreased as the calcium stearate content increased. Furthermore, it was confirmed that the contact angle of the test piece using the pozzolanic substance and calcium stearate was twice as high. It was confirmed that the sand test specimen had the highest water absorption rate, and the DT3% had the lowest. (Sand%: 11.8 > OPC: 6.5 > DT3%: 2.4), the chloride diffusion coefficient also showed similar results. (Sand%: 12.5 > OPC: 8.4 > DT1%: 8.8)Due to its unique insolubility, calcium stearate retards hydrate formation when mixed alone and negates compressive strength loss when combined with pozzolanic mixtures rich in SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>. Furthermore, the ideal method for producing water-resistant cement mortar is to evenly disperse calcium stearate in the porous powder of cement mortar. |
| first_indexed | 2024-03-09T09:52:34Z |
| format | Article |
| id | doaj.art-1c53ecf785f0480cae6e61e0d49a8951 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T09:52:34Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-1c53ecf785f0480cae6e61e0d49a89512023-12-01T23:57:00ZengMDPI AGMaterials1996-19442022-08-011516576210.3390/ma15165762Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface TreatmentJang-Hyun Park0Chang-Bok Yoon1Korea Institute of Future Convergence Technology, Hankyong National University, Anseong 17579, KoreaDepartment of Architectural Engineering, Seoil University, Seoul 02192, KoreaApplying a concrete surface treatment method (epoxy or primer) can prevent water from penetrating concrete through surface pores. However, if the concrete surface is damaged, the subsequent reconstruction can be expensive and time-consuming. Concrete that is resistant to internal and external water has been extensively developed and used to supplement the surface treatment method. Herein, we prepared specimens by mixing cement mortar with fatty-acid-salt-based calcium stearate attached to two natural pozzolanic materials—diatomite and yellow clay. The physical tests measured (1) the air content, (2) flow test, (3) compressive strength, and (4) activity Factor. Durability experiments were performed on (1) the contact angle, (2) chloride ion diffusion coefficient, and (3) water absorption test. The results revealed that the compressive strength of concrete decreased as the calcium stearate content increased. Furthermore, it was confirmed that the contact angle of the test piece using the pozzolanic substance and calcium stearate was twice as high. It was confirmed that the sand test specimen had the highest water absorption rate, and the DT3% had the lowest. (Sand%: 11.8 > OPC: 6.5 > DT3%: 2.4), the chloride diffusion coefficient also showed similar results. (Sand%: 12.5 > OPC: 8.4 > DT1%: 8.8)Due to its unique insolubility, calcium stearate retards hydrate formation when mixed alone and negates compressive strength loss when combined with pozzolanic mixtures rich in SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>. Furthermore, the ideal method for producing water-resistant cement mortar is to evenly disperse calcium stearate in the porous powder of cement mortar.https://www.mdpi.com/1996-1944/15/16/5762calcium stearatewater repellentnatural pozzolandiatomite |
| spellingShingle | Jang-Hyun Park Chang-Bok Yoon Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment Materials calcium stearate water repellent natural pozzolan diatomite |
| title | Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment |
| title_full | Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment |
| title_fullStr | Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment |
| title_full_unstemmed | Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment |
| title_short | Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment |
| title_sort | properties and durability of cement mortar using calcium stearate and natural pozzolan for concrete surface treatment |
| topic | calcium stearate water repellent natural pozzolan diatomite |
| url | https://www.mdpi.com/1996-1944/15/16/5762 |
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