Speaker 1: Timothy Kofi Ametefe
Title: Mechanical and durability properties of low grade calcined clay concrete
In this work, low grade calcined clay was used to replace OPC at 50% by weight. The calcined clay concrete was compared with the control in terms of strength (compression and flexural) and durability (Rapid chloride permeability test and resistance to acid attack). The results of the study indicated that both the control and the calcined clay concrete were suitable for a C30 concrete classification after 28 days curing in saturated lime water. For the flexural strength, the control was 36% higher than the calcined clay concrete. With the durability the calcined clay concrete showed a lower permeability to chloride than the control concrete. The calcined clay concrete also exhibited a higher resistance to the attack of acid than the control concrete. The 50% calcined clay concrete was suitable for C30 concrete mix and is recommended for construction.
Speaker 2: Manette NJIKE
Title: Potential of Straw- Gum Blocks as Building Materials
Straw bale presents many advantages like low carbon footprint and can significantly reduce building’s energy consumption. However, it has low compressive strength and displays high displacement under compression load. So far, no attempt has been made in order to enhance the strength of straw bales. This study aimed to develop alternative material to straw bale using chopped straw stems mixed with a binder (gum Arabic). Results obtained show that the compressive strength of straw blocks (1.25MPa) is greater than the strength of straw bales (0.02MPa). Also, the average displacement recorded during compression test on straw blocks was 2.8 times smaller than the displacement in straw bales.
This webinar is brought to you by the RILEM Youth Council (RYC) and hosted by Dr Nonkululeko Radebe, RYC Sub Saharan Africa Representative.