EFFECTS OF CURING METHODS ON THE PROPERTIES OF HARDENED RICE HUSK ASH AND SUGARCANE BAGASSE ASH CONCRETE
EFFECTS OF CURING METHODS ON THE PROPERTIES OF HARDENED RICE HUSK ASH AND SUGARCANE BAGASSE ASH CONCRETE
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Date
2016-12
Authors
TIAMIYU, Audu Inuwa
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Abstract
Factors that affect the strength and durability of concrete include quality and quantity of
cement used in a mix, grading of aggregates, shape and surface texture of aggregates,
Water/cement ratio, curing methods, admixture. A lot of researches were carried out to
identify the best curing method for concrete. The aim of this research work is to assess the
efficiency of different curing methods for concrete produced using rice husk ash (RHA) and
sugarcane bagasse (SBA) ash as partial replacement of ordinary Portland cement. The
objectives were achieved by determining the effects of curing methods on specimens, and by
studying the micro structure of the specimens subjected to various curing methods. RHA and
SBA were sourced locally and chemical test was carried out to check their chemical
properties. The RHA and SBA were used to replace the mixing cement at 5% and 20%
respectively. The targeted concrete strength value was 30N/mm2 at 28 days, which serves as
the control value. 29.6 N/mm2 and 29.0 N/mm2 were obtained for RHA and SBA concrete
respectively at 28 days under immersion method, while 29.2 N/mm2
and 19.0 N/mm2 were
obtained for RHA and SBA under spraying method and 29.2 N/mm2
and 20.0 N/mm2 were
obtained for RHA and SBA under polythene method. These indicated that immersion curing
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method was the best curing method for both RHA and SBA specimens. The micro structure
analysis also indicated that the specimens subjected to immersion curing method possessed
less pores of 0.41 µm² with highest pore ratio of 287.49 µm² and less pores of 0.18 with the
highest pore ratio of 257.33 µm² for RHA and SBA respectively. This contributed to higher
strength of the RHA and SBA concrete specimens. Water immersion curing method is
recommended as the best curing method but spraying method may appear to be more
advantageous where water immersion method is difficult to achieve.
Description
A THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU
BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILLMENT OF THE AWARD OF MASTER OF SCIENCE DEGREE IN
CONSTRUCTION TECHNOLOGY
DEPARTMENT OF BUILDING, FACULTY OF ENVIRONMENTAL DESIGN
AHMADU BELLO UNIVERSITY, ZARIA – NIGERIA
Keywords
EFFECTS,, CURING METHODS,, PROPERTIES OF HARDENED RICE,, HUSK ASH,, SUGARCANE BAGASSE ASH CONCRETE