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Compressive and flexural behavior of pozzolan from pumice-cement mortar
Oseni, O1, Audu M2.
The need to find alternative cementitious material in concrete works is inevitable
because of high cost of cement. Pumice ash is a possible material that could be used as partial or
total replacement for cement provided the compressive and flexural properties of the concrete
from it meet the ACI/ASTM specifications. This paper present the chemical composition of
pumice ash and the mechanical properties of pozzolan from pumice ash. It showed how the
partial replacement of cement with pumice powder (ash) affects the compressive and flexural
properties of the pozzolanas from pumice-cement mortar. 50g of pumice was collected to make
five samples for the chemical analysis. The samples were crushed and grounded to powdered
form. Chemical analysis of the pumice ash sample was carried out using the X-ray florescence
(XRF Spectra IQ) technique. For the mechanical properties of the mortar from pumice powder,
three samples of cubes and three samples of beams were made from pumice ash mortar at 5 %,
10 % and 15 % replacement of cement. The compressive and flexural strengths of the cubes and
beam samples were determined in accordance with ASTM C 109 and C 348 respectively. The
results showed that combination of Silicon Oxide, Aluminum Oxide and Iron Oxide of the
pumice ash is 78.86 % which is greater than 70 %, the minimum requirement of a good pozzolan
manufacturing of blended cement should meet. It was observed that the compressive and the
flexural strengths of the mortar increased with age but decreased with increase in percentage of
pumice ash in the mortar. At 28 days, the compressive stress of 0, 5, 10 and 15 % replacement
were 58.4, 35.2, 31.2 and 30.0 N/mm2. Similarly, the flexural strengths of 0, 5, 10 and 15 %
replacement were 9.71, 6.90, 6.55 and 6.20 N/mm2 at 28 days. The mortar mix can be classified
as type M (ASTM C 109) which is applicable in construction of moderate loading walls and
structures.
Affiliation:
- University of Abuja, Nigeria
- University of Abuja, Nigeria
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