Rice husk ash as a partial replacement of cement in high strength concrete containing micro silica: Evaluating durability and mechanical properties
By S. A. Zareei, Farshad Ameri, Farzan Dorostkar, M. Ahmadi. 2017
354 citations recorded by the source corpus.
Abstract The preliminary and inevitable interest in the use of partial replacements or by – products as complementary pozzolanic materials was mostly induced by enforcement of air pollution control resulted from cement production industry. Rise husk is by- product taken from rice mill process, with approximately the ratio of 200 kg per one ton of rice, even in high temperature it reduces to 40 kg. This paper presents benefits resulted from various ratios of rice husk ash(RHA) on concrete indicators through 5 mixture plans with proportions of 5, 10, 15, 20 and 25% RHA by weight of cement in addition to 10% micro- silica (MS) to be compared with a reference mixture with 100% Portland cement. Tests results indicated the positive relationship between 15% replacement of RHA with increase in compressive strengths by about 20%. The optimum level of strength and durability properties generally gain with addition up to 20%, beyond that is associated with slight decrease in strength parameters by about 4.5%. The same results obtained for water absorption ratios likely to be unfavourable. Chloride ions penetration increased with increase in cement replacement by about 25% relative to the initial values (about less than one fifth).
Subfields: Building and Construction, Civil and Structural Engineering
View Paper: https://www.semanticscholar.org/paper/57ac4d7e8bd3c212196639c3412477fed4577d27
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In Building and Construction
In Civil and Structural Engineering
Citations in the corpus
- Green Concrete: By-Products Utilization and Advanced Approaches (2019, background): “For example, fly ash decreases the setting time for mass concrete structures without affecting the long-term strength [7–9] and even with better workability [9–11], rice husk ash reduces water absorption of concrete [12,13] and improves the durability properties [12–14], as well as chemical resistan”