Article info.

ABSTRACT

Received 29 Jun 2016
Revised 19 Sep 2016

Accepted 29 Jul 2017

This paper is aimed to study the feasibility of using a mixture of fly ash and residual rice husk ash for producing unfired building bricks. The brick mixtures were designed using densified mixture design algorithm concept. A small amount of ordinary Portland cement (5–10%) was added into the mixtures as binder substitution. Especially, unground rice husk ash was used to replace natural aggregate in the mixtures by 10–20%. The brick samples with dimensions of 220×105×60 mm were prepared in accordance with TCVN 1451:1998 using a forming pressure of 35 MPa. These samples were subjected to the tests of compressive strength, flexural strength, water absorption, and bulk density. The experimental results revealed that all of the brick samples achieved good mechanical properties that well-conformed to the requirements of the related Vietnamese standards. The compressive strength and water absorption of the brick samples were respectively in the range of 13.8-19.7 MPa and 9.7-14.8%. The results of the present study further demonstrated a great potential to produce the unfired building bricks from fly ash and residual rice husk ash.

Keywords

Densified mixture design algorithm, fly ash, rice husk ash, unfired building brick

Cited as: Phuoc, H.T., 2017. Engineering properties of unfired building bricks incorporating various industrial wastes. Can Tho University Journal of Science. Vol 6: 69-73.