Performance of Cement Mortar Exposed to Different Temperature and Curing Methods
Curing is an important process to achieve the specified concrete strength and durability. The objectives here is to determine the effect of four curing regimes on the development of mechanical properties for mortar specimens with mix proportions of 1:2.75 cement to sand by mass with W/C of 0.46, and with standard cube and prism dimensions, using OPC and SRPC; specimens tested under curing temperatures at 25 °C and 45 °C; to simulate the seasonal climatic conditions in Iraq. Curing methods adopted were: 1st: immersion in water, 2nd: wetting by using saturated covers, 3rd: curing by using wax-based compound, and 4th: by air curing. The specimens were examined at the ages of 3, 7, 14, and 28 days for density and mechanical properties. The study highlights that fully-saturated specimens in water is the recommended curing; as test results indicate that the highest mechanical properties were obtained. Considering the compressive strength as the criterion, curing by using wax-based compound came 2nd; and curing by saturated covers in 3rd position. This is true for temperatures at 25 °C and 45 °C; however, the experiments carried on OPC mortar show that increasing the temperature from 25 °C to 45 °C increases the early strength at 3 and 7 days by 16% and 22%, respectively; while the strengths at 14 and 28 days indicate an opposite manner; as the strength decreases when comparing the testing results at those ages by 23% and 17%. This is also valid for SRPC mortar and water-immersion curing for the same temperatures and corresponding ages; 25% and 19% increase at 3 and 7 days, respectively; but the results show that there was a continuous increase in strength at 14 and 28 days, by 29% and 33%, respectively. The study points out that immersion-curing in high temperatures is not recommended for OPC mortars after the age of 7 days; while it could be used for SRPC mortars.
Naus, D. J., and H. L. Graves. “A Review of the Effects of Elevated Temperature on Concrete Materials and Structures.” Volume 1: Plant Operations, Maintenance and Life Cycle; Component Reliability and Materials Issues; Codes, Standards, Licensing and Regulatory Issues; Fuel Cycle and High Level Waste Management (January 1, 2006): 615–624. doi:10.1115/icone14-89631.
Kosmatka, Steven H., Beatrix Kerkhoff, and William C. Panarese. “Design and control of concrete mixtures.” Vol. 5420. Skokie, IL: Portland Cement Association, 2002.
A. M. Neville, 'Properties of concrete'. John Wiley & Sons, (1996).
Al-Gahtani, A.S. “Effect of Curing Methods on the Properties of Plain and Blended Cement Concretes.” Construction and Building Materials 24, no. 3 (March 2010): 308–314. doi:10.1016/j.conbuildmat.2009.08.036.
305R-99,'Hot Weather Concreting’, (1999), p. 20.
Yang, Keun-Hyeok, Jae-Sung Mun, and Myung-Sug Cho. “Effect of Curing Temperature Histories on the Compressive Strength Development of High-Strength Concrete.” Advances in Materials Science and Engineering 2015 (2015): 1–12. doi:10.1155/2015/965471.
Krishna, Rao, Rathish Kumar, and Azhar Khan. “A Study on the Influence of Curing on the Strength of a Standard Grade Concrete Mix.” Facta Universitatis - Series: Architecture and Civil Engineering 8, no. 1 (2010): 23–34. doi:10.2298/fuace1001023k.
Goel, Ajay, Jyoti Narwal, Vivek Verma, Devender Sharma, and Bhupinder Singh. "A Comparative Study on the Effect of Curing on the Strength of Concrete." International Journal of Engineering and Advanced Technology (IJEAT) 2 (2013): 401-406.
Raheem, Akeem Ayinde, Aliu Adebayo Soyingbe, and Amaka John Emenike. "Effect of curing methods on density and compressive strength of concrete." International Journal of Applied Science and Technology 3, no. 4 (2013): 55-64.
Nahata, Yash, Nirav Kholia, and T.G. Tank. “Effect of Curing Methods on Efficiency of Curing of Cement Mortar.” APCBEE Procedia 9 (2014): 222–229. doi:10.1016/j.apcbee.2014.01.040.
Princy K P, and Dr. Elson John. “Study on the Effectiveness of Various Curing Methods on the Properties of Concrete.” International Journal of Engineering Research And V4, no. 11 (November 17, 2015). doi:10.17577/ijertv4is110263.
Olofinnade, Oluwarotimi M., Anthony N. Ede, Julius M. Ndambuki, and David O. Olukanni. "Effects of different curing methods on the strength development of concrete containing waste glass as substitute for natural aggregate." Covenant Journal of Engineering Technology 1, no. 1 (2017): 17-33.
D. H. Prakash and K. Prasanthi, ‘Study on concrete strength parameters under different curing conditions’, International Journal of Civil Engineering and Technology (IJCIET) 9 no. 6 (2018): 84–92.
N. Jiji et al., ‘Influence of curing methods on strength of concrete at early age’, International Journal of Civil Engineering and Technology (IJCIET) 9 no. 4 (2018): 473–481.
Zeyad, Abdullah M. “Effect of Curing Methods in Hot Weather on the Properties of High-Strength Concretes.” Journal of King Saud University - Engineering Sciences 31, no. 3 (July 2019): 218–223. doi:10.1016/j.jksues.2017.04.004.
ASTM C 150, 'Standard Specification for Portland cement'. Annual Book of ASTM Standards, USA, (2012).
Iraqi Standard Specification (IQS), ‘No.5/1984, Portland Cement’, Central Organization for Standardization & Quality Control (COSQC), Baghdad, Iraq, (1984).
Iraqi Standard Specification (IQS), ‘No.45/1984, Aggregates from Natural Sources for Concrete and Construction’, Central Organization for Standardization & Quality Control (COSQC), Baghdad, Iraq, (1984).
ASTM C 109, ‘Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (using 2in. or [50-mm] Cube Specimens)’, Annual Book of ASTM Standards, USA, (2013).
ASTM C 348, ‘Standard test method for flexural strength and modulus of hydraulic cement mortars’, Annual Book of ASTM Standards, USA, (2002).
Cebeci, Omer Z. “Strength of Concrete in Warm and Dry Environment.” Materials and Structures 20, no. 4 (July 1987): 270–272. doi:10.1007/bf02485923.
Copyright (c) 2020 samer muayad alsadik
This work is licensed under a Creative Commons Attribution 4.0 International License.