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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 60  2001
Chemical Reaction Bonding of Earth Mud Building Blocks
J. L. Gumaste and B.C. Swain
Pages : 34-36
DOI : 10.1080/0371750X.2001.10799957
Abstract
In recent years, chemical reaction bonding has been tried for the production of building materials. Sodium hydroxide and orthophosphoric acid were used as chemical binders in this ~nvestigation. These chemical binders are uniformly dispersed 1n earth mud at a concentration level of 1.0 and 2.0 wt% NaOH, and 0.2, 0.5 and 1.0 wt% H3P04 in presence of 10-12 wt% moisture in separate batches. The homogeneously mixed mass is compacted into blocks which are dried at room temperature and 373 K for 1 h and subsequently reaction bonded at 573, 673, 773 and 873 K for 1 h in air. The earth mud building block consisting of 1% (by weight) NaOH + 0.2% H3P04 and reaction bonded at 673 K for 1 h shows CCS of 8.0 MPa. Hand compacted earth mud ~uilding block consisting of 1% NaOH and 0.5% H3P04 , which is f1red at 673 K for 1 h in air, shows CCS of 6.0 MPa. The above mentioned building blocks show good resistance to water swelling and fluctuations in environmental conditions.
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