Factors affecting sustainability indices and life cycle assessment of concrete containing rice husk ash: a database study

2022-2-11
Öztürk, Ece
The rice husk ash (RHA), attained by burning the husk that is removed in the process of the production of rice, possesses high pozzolanic activity and therefore is a promising, supplementary cementitious material. The thesis comprises a large database comprising over 1000 data on the RHA incorporation in concrete to examine the principal sustainability components such as CO2 emissions, cost efficiency, and eco-strength efficiency, as well as to perform a comprehensive life cycle assessment attained during this practice. Independent determination of the boundary conditions played a vital role in both the sustainability and life cycle assessment. The results showed that the use of RHA along with the pozzolanic materials could lead to a 25% reduction in the CO2 emissions generated during the concrete production in conjunction with a 65% rise in the cost efficiency of such practices. Life cycle assessment has already shown that 30% RHA as cement replacement along with the 30% fly ash already resulted in a 59% reduction in a global warming potential along with the 46% reduction in ozone depletion. It was vital to perform the life cycle assessment to validate the preciseness of the sustainability analysis as well as to demonstrate that the results in both analyses are in a great correlation. The findings reported in this study do not only suggest significant sustainable consequences for the construction practice but also encourage greener waste management routes to be established for RHA.

Suggestions

Effects of an edible coating, fungicide and cold storage on microbial spoilage of cherries
Yaman, O; Bayındırlı, Levent A. (2001-01-01)
The effects of an edible coating, i.e., Semperfresh (TM), fungicide, i.e., Imazalil, and cold storage on microbial spoilage of cherries were studied. Two group of cherries (Prunus avium) were coated just after harvest with 1% and 2% Semperfresh (TM) fruit coating. Two other group of cherries were treated with 75 ppm and 150 ppm concentrations of Imazalil and then coated with a 1% concentration of Semperfresh (TM) fruit coating. Half of the cherries from each of the above groups was stored at ambient tempera...
Mechanical properties, durability, and life-cycle assessment of self-consolidating concrete mixtures made with blended portland cements containing fly ash and limestone powder
Çelik, Kemal; Akgül, Çağla; Gursel, A. Petek; Mehta, P Kumar; Horvath, Arpad; Monteiro, Paulo JM (2015-02-01)
This paper reports the composition and properties of highly flowable self-consolidating concrete (SCC) mixtures made of high proportions of cement replacement materials such as fly ash and pulverized limestone instead of high dosage of a plasticizing agent or viscosity-modifying chemical admixtures. Self-consolidating concrete mixtures are being increasingly used for the construction of highly reinforced complex concrete elements and for massive concrete structures such as dams and thick foundation. In this...
Dielectric and Thermal Properties of Rice Cake Formulations Containing Different Gums Types
Turabi, Elif; Şümnü, Servet Gülüm; Sumnu, Gulum; Şahin, Serpil; Rother, Matthias (Informa UK Limited, 2010-10-25)
In this study, dielectric properties of rice cake formulations containing different gum types (xanthan, guar, locust bean, HPMC, and kappa-carrageenan) were determined at temperatures between 25 and 90 degrees C at 2450 MHz. Moreover, thermal properties of these formulations were determined by using differential scanning calorimeter (DSC). Dielectric properties of cake batters were found to be dependent on cake formulation. Xanthan and guar gum containing cake batters had the highest dielectric constant and...
OPTIMIZATION OF HEMICELLULOSE COATING AS APPLIED TO APRICOT DRYING AND COMPARISON WITH CHITOSAN COATING AND SULFITE TREATMENT
Ubeyitogullari, Ali; Çekmecelioğlu, Deniz (2016-12-01)
Drying of hemicellulose-coated apricots was compared to sulfuring and chitosan coating. Air velocity, temperature and hemicellulose concentration were optimized using the Box-Behnken response surface methodology against total color change (Delta E-star), yellowness (Delta b(star)) and final moisture content. Drying kinetics were evaluated by Newton, Page and Logarithmic models. Diffusion coefficient, activation energy and rehydration rate were calculated. The optimal drying conditions were found as 1 m/s of...
Impact of Occupant Behaviour on Energy Consumption in Buildings
Elias Özkan, Soofia Tahira(2016-12-31)
Yapılı çevrede enerji korunumu çalışmaları genel olarak bina kabuğu ve sistem teknolojileri konularında sürdürülmekte olup kullanıcın yapı enerji performansına etkisi az sayıda çalışmalarda incelenmiştir. Bu bağlamda, bu çalışmada kullanıcı davranışının enerji kullanımına etkisini özellikle ısıtma döneminde kullanıcının ısıl konfor koşullarına müdahalesi açısından incelemek ve seçilecek çalışma alanında gerekli verileri toplamak amaçlanmaktadır. Toplanacak olan bu veriler gerçek enerji tüketim karakteri ve ...
Citation Formats
E. Öztürk, “Factors affecting sustainability indices and life cycle assessment of concrete containing rice husk ash: a database study,” M.S. - Master of Science, Middle East Technical University, 2022.