MOJ MOJCE

Civil Engineering
Editorial
Volume 1 Issue 2 - 2016
Cementless Concrete for Sustainable Construction
Amr Salah El-Dieb*
Department of Civil and Environmental Engineering, United Arab Emirates University, UAE
Received: October 14, 2016 | Published: October 21, 2016
*Corresponding author: Amr Salah El-Dieb, Civil and Environmental Engineering Department, United Arab Emirates University, PO Box 15551, Al Ain, UAE, Tel: +971 3 713 5153; Fax: +971 3 713 4997; Email:
Citation: El-Dieb AS (2016) Cementless Concrete for Sustainable Construction. MOJ Civil Eng 1(2): 00008. DOI: 10.15406/mojce.2016.01.00008

Editorial

Green environment is a challenging concern to accomplish in today’s world. This could be achieved through a beneficial recycling procedure that aims at reusing solid waste materials. Concrete industry can play a huge role in sustainable development of the society. Production of 1 ton of Portland cement is an energy intensive process and also generates about 1 ton of CO2 [1,2], which represents about 5-7% of the global green-house gas produced annually. The increase in population needs development plans especially for infrastructure, thus there will be an increasing demand on cement and therefore an expected increase in CO2 emission which will have negative impact on the environment. Usage of substitution materials as partial or complete replacement of cement is considered an efficient solution. Silica fume, fly ash and slag are used as supplementary cementing materials (SCM) in daily concrete production [3]. This step has made its effect on reducing the CO2 emission. With the current practice which involves the use of SCM in the range of 20% to 50% replacement of OPC, the CO2 emission from cement production is reduced by around the half [3].

The alkali-activated binders have emerged as an alternative [4-6] sometimes referred to as inorganic-polymer concrete or geopolymer concrete. In geopolymer concrete, cement is completely replaced by alkali activated aluminosilicate-rich materials. This new concrete type started to attract several investigators. The geopolymer concrete utilizes any material composed of silica and aluminum which can be alkali-activated to form a CaO-free alumino-silicate binder. During the last decade increased research was directed to the development of this new material due to the wide range of potential applications [7]. The performed investigations utilized different prime (i.e. source or binder) materials such as metakaoline, blast-furnace slag, fly ashes, mixtures of fly ash and metakaoline, mixtures of fly ash and slag [8].

As seen from these investigations, the prime materials used are mainly solid waste byproducts; therefore the geopolymer technology has the potential to reduce the CO2 emission by about 80% [9]. Several solid wastes such as ladle slag, ceramic powder and red mud are generated from different industries and only find its way in landfill. This brings a major challenge with respect to its environmental impact. On the other hand, it represents a good opportunity to be utilized in making geopolymer concrete. These solid waste materials were not explored for geopolymer concrete and did not attract the attention of researchers. The utilization of these solid waste materials in the production of geopolymer concrete will have multifold benefits; it will help reduce the carbon dioxide emission by reducing the cement production, help reserve natural resources used to manufacture cement and help protect the environment by recycling solid wastes. The produced geopolymer concrete is expected to play a significant role in producing sustainable construction.

References

  1. P Chindaprasirt, T Chareerata, V Sirivivatnanon (2007) Workability and Strength of Coarse High Calcium Fly Ash Geopolymer. Cement and Concrete Composites 29(3): 224-229.
  2. F Pacheco-Torgal, Z Abdollahnejad, AF Camões, M Jamshidi, Y Ding (2012) Durability of Alkali-Activated Binders: A Clear Advantage over Portland cement or an Unproven Issue? Construction and Building Materials 30(2012): 400-405.
  3. Jannie SJ Van Deventera, John L Provisa, Peter (2012) Duxsonb Technical and Commercial Progress in the Adoption of Geopolymer Cement. Minerals Engineering 29(2012): 89-104.
  4. Fernando Pacheco-Torgal, João Castro-Gomes, Said Jalali (2008) Alkali-Activated Binders: A Review Part 1. Historical Background, Terminology, Reaction Mechanisms and Hydration Products. Construction and Building Materials 22(7): 1305-1314.
  5. Caijun Shi, A. Fernández Jiménez, Angel Palomo (2011) New cements for the 21st Century: The Pursuit of an Alternative to Portland cement. Cement and Concrete Research 41(4): 750-763.
  6. Peter Duxson, John L Provis, Grant C Lukey, Jannie SJ van Deventer (2007) The Role of Inorganic Technology in the Development of Green Concrete. Cement and Concrete Research 37(12): 1590-1597.
  7. Konstantinos A Komnitsas (2011) Potential of Geopolymer Technology towards Green Buildings and Sustainable Cities. Procedia Engineering 211023-1032.
  8. Fernando Pacheco-Torgal, João Castro-Gomes, Said Jalali (2008) Alkali-Activated Binders: A Review Part 2. About Materials and Binders Manufacture. Construction and Building Materials 22(7): 1315-1322.
  9. Daniel LY Kong, Jay G Sanjayan (2008) Damage Behavior of Geopolymer Composites Exposed to Elevated Temperatures. Cement and Concrete Composites 30(10): 986-991.
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