Mechanical Properties, Thermal Conductivity and Microstructure of Hemp Concretes

Authors

  • Wunchock Kroehong Department of Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Tawan-ok, Uthenthawai Campus, Bangkok, Thailand
  • Sattawat Haruehansapong Department of Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Tawan-ok, Uthenthawai Campus, Bangkok, Thailand

Keywords:

Hemp Concrete, Mechanical Properties, Microstructure

Abstract

This paper reports mechanical properties, thermal conductivity and microstructure of hemp concretes as well as the results on the potential of using hemp shiv as coarse aggregate in concrete. Hemp shiv was mineralized with aluminium sulfate and calcium hydroxide prior to being used as coarse aggregate to produce hemp concretes. The ratio of hemp was varied at 0.8%, 1.2%, 1.6%, 2.0% and 2.4% of the weight of cement, while the cement to sand ratio was fixed at 1:2. The ratio of Al2(SO4)3 to Ca(OH)2 was 1:2 and the amount of superplasticizer was fixed at 1% by weight of cement. The results illustrated that compressive strength and flexural strength of the sample with the lowest ratio of hemp (0.8%) were higher than those of the sample with the highest ratio of hemp. Thermal conductivity of concrete with the highest ratio of hemp (2.4%) was lower than that of the sample with the lowest ratio of hemp. Sample at the highest ratio of hemp exhibited higher porosity and more extensive pore distributions, resulting in a lower compressive strength. The results on microstructure and those on compressive strength corresponded with each other.

References

Netinger Grubeša, I., Marković, B., Gojević, A. and Brdarić, J., 2018, “Effect of Hemp Fibers on Fire Resistance of Concrete,” Construction and Building Materials, 184, pp. 473-484.

Çomak, B., Bideci, A. and Salli Bideci, Ö., 2018, “Effects of Hemp Fibers on Characteristics of Cement Based Mortar,” Construction and Building Materials, 169, pp. 794-799.

Ramadan, R., Saad, G., Awwad, E., Khatib, H. and Mabsout, M, 2017, “Short-Term Durability of Hemp Fibers,” Procedia Engineering, 200, pp. 120-127.

Wadi, H., Amziane, S., Toussaint, E. and Taazount, M., 2019, “Lateral Load-Carrying Capacity of Hemp Concrete as a Natural Infill Material in Timber Frame Walls,” Engineering Structures, 180, pp. 264-273.

Seng, B., Magniont, C. and Lorente, S, 2019, “Characterization of a Precast Hemp Concrete Block Part II: Hygric Properties,” Journal of Building Engineering, 24, pp. 546-568.

Dubois, V., Wirquin, E., Flament, C. and Sloma, P., 2016, “Fresh and Hardened State Properties of Hemp Concrete Made up of a Large Proportion of Quarry Fines for the Production of Blocks,” Construction and Building Materials, 102, pp. 84-93.

Pantawee, S., Sinsiri, T., Jaturapitakkul, C. and Chindaprasirt, P, 2017, “Utilization of Hemp Concrete Using Hemp Shiv as Coarse Aggregate with Aluminium Sulfate [Al2(SO4)3] and Hydrated Lime [Ca(OH)2] Treatment,” Construction and Building Materials, 156, pp. 435-442.

Seng, B., Magniont, C. and Lorente, S, 2019, “Characterization of a Precast Hemp Concrete. Part I: Physical and thermal properties,” Journal of Building Engineering. 24, pp. 346-356.

Niyigena, C., Amziane, S. and Chateauneuf, A, 2019, “Assessing the Impact of Calculation Methods on the Variability of Young’s Modulus for Hemp Concrete Material,” Construction and Building Materials, 198, pp. 332-344.

Gourlay, E., Glé, P., Marceau, S., Foy, C. and Moscardelli, S, 2017, “Effect of Water Content on the Acoustical and Thermal Properties of Hemp Concretes,” Construction and Building Materials, 139, pp. 513-523.

Arnaud, L. and Gourlay, E., 2012, "Experimental Study of Parameters Influencing Mechanical Properties of Hemp Concretes," Construction and Building Materials, 28 (1), pp. 50-56.

American Society for Testing and Material, 2012, "ASTM C518 Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus," Annual Book of ASTM Standard, Philadelphia.

Jittabut, P., 2019, "The Mechanical Properties and Thermal Conductivity of Concrete Block from Agricultural Wastes," The Journal of KMUTNB, 29 (2), pp. 342-351.

Sanawung, W., Tangchirapat, W. and Jaturapitakkul, C., 2018, "Strength, Abrasion Resistance, and Chloride Ion Penetration of Concrete Containing Palm Oil Fuel Ash," KMUTT Research and Development Journal, 41 (1), pp.83-96.

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Published

2020-03-31

How to Cite

Kroehong, W., & Haruehansapong, S. (2020). Mechanical Properties, Thermal Conductivity and Microstructure of Hemp Concretes. Science and Engineering Connect, 43(1), 91–102. retrieved from https://ph04.tci-thaijo.org/index.php/SEC/article/view/10656

Issue

Vol. 43 No. 1 (2020): January - March

Section

Research Article

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