A COMPARATIVE STUDY OF MECHANICAL PROPERTIES BETWEEN CONCRETE MADE BY USING Portland Pozzolan CEMENT AND TYPE I PORTLAND CEMENT

I Made Alit Karyawan Salain

Volume : VI, Issue : V, May - 2016

A COMPARATIVE STUDY OF MECHANICAL PROPERTIES BETWEEN CONCRETE MADE BY USING Portland Pozzolan CEMENT AND TYPE I PORTLAND CEMENT

I Made Alit Karyawan Salain

Abstract :

<p>&nbsp;The mechanical properties of concrete made by using Pozzolan Portland cement (PPC) have been compared to that made by using type I Portland cement (PCI) at the age of hydration 3, 7, 28 and 90 days. The compared mechanical properties concern compressive strength, modulus of elasticity and permeability. Concrete was made by using a proportion, by weight, of 1.0 cement: 2.0 sand: 3.0 crushed stone and water cement ratio of 0.4. The grain distribution of sand and crushed stone were designed according to SNI 03&ndash;2834&ndash;2000 to meet respectively the gradation zone 2 for fine aggregate and the granules with a maximum diameter of 40 mm for coarse aggregate. Tests were carried out using cylindrical specimens, diameter = 150 mm and height = 300 mm. The results show that at the early age, concrete using PPC produces lower compressive strength and modulus of elasticity but higher permeability coefficient compared to concrete using PCI. However, at the longer age (90 days), concrete using PPC can produce higher compressive strength and modulus of elasticity, respectively about 8% and 15%, and lower permeability coefficient, about 50%, compared to concrete using PCI. This phenomenon can be strongly attributed to the reduced porosity of concrete as indicated by the results of permeability test. The reaction result between reactive silica and alumina of Pozzolan in PPC with calcium hydroxide produced from the hydration of C3S and C2S in PCI contributes to increase the density of the concrete matrix such that, on the long period, the mechanical properties of concrete using PPC are better than that using PCI.</p>