Fly ash colgrout masonry – a economical impermeable masonry for water retaining structures

Mass works are generally constructed in UCR masonry. It was observed that in this masonry, the voids in the rubbles are not filled up properly with cement mortar which led to heavy seepages through the body of dam after commissioning. This was mainly due to the fact that placement of mortar was not done properly by unskilled inexperienced masons. Colgrout masonry is found to be a best replacement to conventional masonry. Colgrout mortar is a flowy mortar and gets filled in each and every void in rubbles providing dense, strong and impermeable masonry at w/c ratio as high as 0.85. This technique has built in quality control.