- Volume 23 Issue 5
DOI QR Code
Evaluation of Mechanical and Durability Performance of Mortar Shotcrete
모르타르 숏크리트의 역학성능 및 내구성능 평가
- Park, Byoungsun ;
- Jang, Kun Young ;
- Choi, Young Cheol (Dept. of Civil and Environmental Eng. Gachon University)
- Received : 2019.07.03
- Accepted : 2019.08.29
- Published : 2019.09.01
In this study, the mechanical property and durability of improved bond performance mortar shotcrete was investigated. Mortar shotcrete was prepared by replacing coarse aggregate with 100% fine aggregate in the shotcrete mixture proportion proposed in the road construction standard specification. OPC, GGBFS and anhydrite were used as binders, and polymer powder was substituted for 1% and 2% of binder for improving bond property. From the experimental results, it was found that the compressive strength decreased with increasing polymer addition, but the bond strength increased. The addition of polymer to mortar shotcrete also reduced the drying shrinkage and improved the resistance to carbonation. Initial hydration heat of mortar shotcrete decreased with the addition of polymer, and it was judged that the initial compressive strength decreased.
Shotcrete;Bond Strength;Mechanical property;Durability
Supported by : 국토교통부, 가천대학교
- Ministry of Land, Infrastructure and Transport. (2019). Road Bridge and Tunnel Status Information System, https://bti.kict.re.kr/bti/
- Ohama, Y. (1987), Principle of latex modification and some typical properties of latex-modified mortars and concretes. ACI Materials Journal., 84(6), 511-518.
- Meishan, P., Yue, W.U., Kim, K.I., Hyung, W.G., Soh, Y.S. (2004), Effect of the Monomer Ratio on the Properties of Poly(methyl methacrylate butyl acrylate) Latex-Modified Mortars, Journal of Applied Polymer Science., 93, 2403-2409. https://doi.org/10.1002/app.20744
- Afridi, M.U.K., Ohama, Y., Demura, K., Iqbal, M.Z. (2003), Development of polymer films by the coalescence of polymer particles in powdered and aqueous polymer-modified mortars, Cement and Concrete Research., 33(11), 1715-1721. https://doi.org/10.1016/S0008-8846(02)01094-3
- Kim, W.K. (2006), Strength and Adhesion Properties of Polymer-Modified Mortars using Redispersible Powders and Polymer Dispersions, Journal of the Architectural Institute of Korea., 22(4), 119-126 [in Korean].
- Song, H. Shin, H.U. (2018), High Temperature Properties of Cement Mortar Using EVA, EVCL Redispersible Polymer Powder and Fly Ash, Journal of the Korea Recycled Construction Resources Institute., 6(4), 365-372 [in Korean].
- KS L ISO 679. (2016), Methods of Testing Cements-Determination of Strength, Korea [in Korean].
- KS F 2762. (2016), Standard Test Method for the Bond Strength of Concrete Repair and Overlay Materials by Pull-Off Method, Korea [in Korean].
- KS F 2424. (2015), Standard Test Method for Length Change of Mortar and Concrete, Korea [in Korean].
- KS F 2584. (2010), Standard Test Method for Accelerated Carbonation of Concrete, Korea [in Korean].
- Shariq, M., Prasad, J., Abbas, H. (2016), Creep and drying shrinkage of concrete containing GGBFS, Cement and Concrete Composites., 68, 35-45. https://doi.org/10.1016/j.cemconcomp.2016.02.004
- Kim, D.Y., Cho, H.K., Lee, H.S. (2014), Effects of the Reaction Degree of Ground Granulated Blast Furnace Slag on the Properties of Cement Paste, Journal of the Korea Concrete Institute., 26(6), 723-730 [in Korean]. https://doi.org/10.4334/JKCI.2014.26.6.723
- Sanjuana, M.A., Estevezb, E., Argizc, C., Barriob, D. (2018), Effect of curing time on granulated blast-furnace slag cement mortars carbonation, Cement and Concrete Composites., 90, 257-265. https://doi.org/10.1016/j.cemconcomp.2018.04.006