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PRODUCTION OF A BANDER MATERIAL WITH AN EXPANSIVE NATURE USED FOR CRACKS REPAIRING IN BUILDINGS FROM A LOCALLY AVAILABLE MATERIALS | ||
| AL-TAQANI | ||
| Article 1, Volume 24, Issue 2, 2011, Pages 1-10 | ||
| Author | ||
| Jabbar Abbas Jabbar | ||
| Abstract | ||
| In this study a practical attempt is performed to produce a binder material of an expansion nature from the locally available materials in Iraq .The material is produced by mixing a limited portions of pure gypsum with cement to achieve the required expansion . Two types of locally produced cements are used , Ordinary Portland Cement ( O.P.C. ) and Sulphate Resisting Portland Cement ( S.R.P.C. ) of Al- Kufa and Karbala factories respectively. A technical gypsum is used throughout this work . Cement is added with three different levels ( 5,10 and 15 )% from the dry weight of gypsum . Fresh mixture is tested for its spread ability , setting time , as well as small joists of ( 25 * 25* 250 ) mm size, are tested to investigate their soundness using autoclave method . Cubes of (50) mm size in addition to prisms of ( 40 * 40 * 160 ) mm are cast to measure their compressive strength and linear expansion respectively , in the hardened state of this mixture .Results indicated that , the material produced from the locally available materials was satisfactory for strength and durability required. The architectural presentation is fair to be used in cracks repair . The results showed that : 1.The produced material was workable in its fresh state and hard enough to resist loads as well as preventing moisture in its hardened state .2. The linear expansion of the produced material at ( 28 ) days age was about ( 100 and 75 ) % compared with the reference expansion at ( 2 hrs ) age by using (O.P.C.) and (S.R.P.C.) addition respectively, which was less than that of pure plaster by about ( 250 )% .3. The compressive strength is higher than that of pure gypsum which was about ( 150% ) more for ( 10 % and 15% ) addition of (O.P.C.) and (S.R.P.C.) respectively at the age of ( 7 )days .4.The autoclave expansion was about ( 1% ) as a maximum in the addition of ( 15% ) of (O.P.C. ) state. | ||
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