Physicochemical properties and pozzolanic performance of ultrafine treated rice husk ash (uftrha) as additive in concrete
Rice husk ash (RHA) contains high amount of amorphous silica that is ubiquitous in the pozzolanic reaction of SCM in concrete. However, usage of conventional RHA is currently unfavourable in concrete industry due to its properties inconsistency. In this regard, improvement on the RHA properties b...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Malaysian Institute of Planners
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/69032/ http://irep.iium.edu.my/69032/ http://irep.iium.edu.my/69032/1/Paper_Asmahani_2018_MIP.pdf http://irep.iium.edu.my/69032/9/69032_Physicochemical%20properties%20and%20pozzolanic_scopus.pdf |
| Summary: | Rice husk ash (RHA) contains high amount of amorphous silica that is ubiquitous
in the pozzolanic reaction of SCM in concrete. However, usage of conventional
RHA is currently unfavourable in concrete industry due to its properties
inconsistency. In this regard, improvement on the RHA properties by introduction
of thermochemical pre-treatment prior to burning procedure is seen as an
excellent way to reach the goal. In this paper, raw rice husk was pre-treated using
0.1N hydrochloric acid (HCl) and heated at 80oC. It was then mechanically
activated by high energy planetary ball mill for 15 minutes at speed of 300rpm
and ball-to-powder ratio (BPR) of 15:1. The chemical composition, mineralogical
properties, particle size analysis, specific surface area as well as microstructure
properties of ultrafine treated rice husk ash (UFTRHA) were determined
accordingly. As for amorphous silica content of the optimum sample was
recorded as 98.60% incinerated at 600oC with four hours of pre-treatment soaking
duration. In terms of particle size and specific surface, it was also observed that,
burning temperature of 600oC, pre-treated at four hours were recorded to produce
finest size of UFTRHA where d(0.1), d(0.5) and d(0.9) were obtained as 1.416
μm, 4.364 μm and 14.043 μm respectively. Largest specific surface area value
was obtained at 219.58 m2/g with the similar pre-treatment conditions.
Meanwhile, the strength activity of UFTRHA from the optimum pre-treatment
process was measured by testing the compressive strength of mortars. The highest
compression value obtained was 50.17MPa with 3% UFTRHA replacement at 28
days. |
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