INNOVATING IMPERMEABLE CONCRETE APPROPRIATE FOR CANAL LINING USING A SPECIFIC MIXING RATIO AND APPLYING IT TO A PILOT REACH | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 7, Volume 41, No 3, May and June 2013, Page 900-918 PDF (555.12 K) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2013.114771 | ||||
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| Author | ||||
| M. I. Abu-Khashaba | ||||
| Associate Professor, Construction Research Institute, Delta Barrages, Egypt. | ||||
| Abstract | ||||
| This research was initiated with the objective of innovating impermeable concrete appropriate for canal lining (i.e. to improve their function, as they lose water through evaporation, seepage and leakage) using a specific mixing ratio (i.e. adapting additives employed for linings). A new mixture (i.e. consisting of mortar, limestone powder and a chemical engineering admixture "EN-1 RBS", mainly defined as a permeability reducing admixture) was proposed to be investigated. Moreover; it was applied to a pilot reach and its effect was examined. Different concrete and mortar mixes with/without admixture were designed and were experimentally investigated to examine the effect of EN-1 on the characteristics of both concrete and mortar mixes as well as their permeability. The examined water content ratios (w/c) were 0.45 and 0.60. EN-1 with different concentrations was also evaluated. The results proved that the permeability/microstructure of EN-1 mixes, as well as its long-term performance, was satisfactorily improved. The piezometer readings, behind the lining with EN-1, were less than that of ordinary lining which indicated the capability of EN-1 in reducing water losses. The difference in the coefficient of permeability reached 61.50% and 81% for the field and laboratory tested, respectively. For the concrete mix with w/c of 0.60, the reduction obtained in the ISAT results was in the range of 38% to 71%, using different EN-1 concentrations. Furthermore, under certain circumstances, the tensile properties, of the new mix for both concrete and mortar (with EN-1 admixture), were enhanced. | ||||
| Keywords | ||||
| Seepage; Impermeable; Admixture; Mortar; limestone Powder; Lining; Concentrations; Initial Surface Absorption Test, ISAT; Permeability; Piezometer | ||||
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