The cement provides bonding, while lime strengthens and reduces shrinking and prevents premature drying. This estimate assumes using a mortar that needs to be mixed with three parts sand. ( BTW- Brick-Lok already has the lime in the mortar.) What I need to know is what is the ratio of water and sand to the Brick-Lok type "S" Mortar? Therefore, it is recommended to dip the masonry units in water for some minutes before the masonry construction. Among these are matching mortar for repointing, which sand to use in your mortar mix, ratio of cement to sand for mortar mix, mortar to water mix ratio, and how to mix mortar for brick pointing. For example their 1 bags of cement. In brick construction we use the 1:6 cement sand ratio -that means 1 cement bag should be mixed with with 6 bags of sands and the water cement ratio is normally taken as the half of cement. Repointing brick needed before water enters. Workability of mortar, when compared with concrete, is high. Type O is the next most common mortar type that sees use almost exclusively indoors. Most mortar products require one bag of cement per 100-142 bricks, depending on the size. A hugely popular product in the building trade (hence the term bricks and mortar being used to describe many buildings), mixing the appropriate amount of mortar for your use can be something of a precise science. Any mortar left on the brick surface will need to be cleaned away with a solution of muriatic acid and water. ... Portland cement was added to the standard lime/sand mortar ratio because of the quick cure time that Portland could achieve and the fast turnaround time of laying the brick and block walls of the structure. Tip 1 - Understanding Mortar Components. A 1:3 cement to sand mix will require one yd 3 of sand for every seven bags of mortar. This is because the masonry units absorb some amount of water, this will reduce the water-cement ratio in the mortar mix that will affect the strength and the bond. The strength of 1:6 ratio of mortar after 28 days is 3.0 N/mm2. This is because type O mortar, after drying, is noticeably weaker than the basic type N. Type O. Mixing mortar for pointing brick is the most important part of the mortar joint repair. To avoid this, be certain the brick surfaces are … The strength of Concrete / Mortar is dependent on the net quantity of water used per sack of cement.. Cement and water are the only two chemically active elements in concrete. thanks. Ken Reply With Quote. By their combination they form a glue-like binder paste, which surrounds and coats the particles of the inert mineral aggregates, sets and upon hardening binds the entire product into a composite mass. i.e. 1 shovel of type S mortar to 3 shovels of sand, and water so its workable, been doing that for 30 years. 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