Influence of rice husk ash, superplasticizer and metakaolin on high strength concrete

Title: Influence of rice husk ash, superplasticizer and metakaolin on high strength concrete
Author(s): H.B. Mahmud, E. Majuar, M.F.M. Zain, N.B.A.A. Hamid, Y.C. Kaoy
Paper category : conference
Book title: International Conference on Advances in Concrete and Structures
Editor(s): Ying-shu Yuan, Surendra P. Shah and Heng-lin Lü
Print-ISBN: 2-912143-41-1
e-ISBN: 2351580176
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 774 - 784
Total Pages: 11
Nb references: 18
Language: English

This paper reports an investigation on the use of rice husk ash (RHA) to produce high strength concrete. Two methods of inclusion of RHA into the concrete mix, four types of superplasticizer and three supplementary cementitious material i.e RHA, metakaolin (MK) and condensed silica fume (CSF) were used as to produce high strength concrete of 80 N/mm2 at 28 days. By using any type of Sp, workability in the range of 200-240 mm slump can be attained. Compared to CSF mixes, RHA mixes require similar or marginally higher dosage of Sp for similar workability. Dosage of Sp needed to produce comparable workability is lower in RHA mixes containing metakaolin than those without.The optimum replacement and addition level for maximum strength for RHA concrete is 5% and 10% respectively. Compared to CSF concrete mixes, the strength of RHA mixes is about 8-10% lower. For the blended OPC/RHA/MK mixes, concrete containing higher amount of RHA produced higher strength. The maximum strength was achieved in concrete containing Sp based on polycarboxylic polyether. Irrespective of the type of Sp, concrete incorporating the agricultural waste RHA can achieve strength of between 85-89 N/mm2 at 28 days. Strength of RHA concrete at 180 days is 10-16% higher than the 28 days strength. Incorporation of RHA is beneficial to the long term strength development of high strength concrete.

Online publication: 2003-08-10
Publication type : full_text
Public price (Euros): 0.00

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