Permeation Resistance of Sawdust Ash Blended Cement Laterized Concrete

Abstract

This paper compared the initial surface absorption of conventional concrete and laterized concrete containing Portland cement (PC) and sawdust ash (SDA). Laterized concrete was produced at laterite contents of 15 and 30% as partial replacement for sand and SDA contents of 10 and 20% as partial replacement for PC. Compressive strengths at 28 days and initial surface absorption after 10 minutes (ISA-10) at 28, 60 and 90 days were determined at the water/cement ratios of 0.35, 0.50 and 0.65 and assessed at equal 28-day strengths of 25-35 N/mm2. At equal water/cement ratios, compressive strength reduced and ISA-10 increased with increasing content of laterite and SDA. On the other hand, compressive strength and resistance to surface absorption of the blended cement laterized concretes increased with increasing curing age. At equal strengths, all the blended cement laterized concretes have better resistance to surface absorption than the conventional PC concrete.

Flexural Strength Characteristics of Pawpaw Leaf Ash and Bamboo Leaf Ash Blended Cement Concrete

“…The need to provide adequate housing for Nigeria's teeming urban and suburban areas, as well as many other parts of Africa, has compelled researchers to continue looking for ways to reduce the cost of construction projects by reducing the consumption of raw materials such as cement in the construction industries, while also protecting the environment and enhancing the quality of the cement used to produce concrete (Ettu et al, 2013). Efforts have therefore, intensified at sourcing for suitable and more affordable local materials like industrial by products that could be used as partial replacement for Ordinary Portland Cement (OPC) in civil engineering and building works (Olugbenga, 2007). Some of the affordable local materials now used are industrial or agricultural by-products (wastes) and the mixture of Ordinary Portland Cement with these industrial by products forms what we now call blended cements (Asha et al, 2014).…”