But adding hydrated lime to the mortar mix can be beneficial. The plasticity or workability of the mix is better. When hydrated lime is added to the mix, the sand and the cement do not separate. The final mortar also is more waterproof. Shrinkage cracking often can be eliminated or minimized when hydrated lime is used. Replacing 10 to 15 percent of the total volume of cement with hydrated lime usually produces optimum results. Keep in mind that the Portland cement is the glue that holds the flagstone and brick to the concrete patio.
I always mix my ingredients 3 parts sand to 1. After surviving 25 years of brutal winter temperatures, my patios look like they did the day they were finished. I am convinced my recipe will work for you as well. On this page: Properties of mortar Types and benefits of using lime in mortars Materials for mortar Building lime standards Mix designation, compressive strength and cement gauging Datasheets.
Datasheets More information can be found on lime in mortars from the Mortar Industry Association website : www. Michael July 14, Trent O'Sullivan July 16, Michael, contact Brendan Coyle Terry Evans July 15, Please contact us for any assistance with your future projects. Terry, contact Brendan Coyle Leave a Comment.
Latest News. Industry Links. High tensile bond strength is developed by the following mortar characteristics: Lime provides high water retention that allows for maximum early curing of the cementitious materials. High initial flow which permits easy complete coverage of masonry units.
The low air content of cement-lime mortar increases bond strength. Extent of Bond - The extent of bond is the percent of brick to which the mortar adheres. The low air content and the fineness and stickiness of hydrated lime particles increase the extent of bond of mortar to brick.
Durability of Bond - See Durability section below There are a number of studies that demonstrate the superior bond strength of cement-lime mortars. Water leakage Studies have shown that cement-lime mortars can be used to minimize the potential for water penetration into masonry walls.
Extent of Bond - Low air content, a fine particle size, high plasticity and water retention contribute to excellent extent of bond for cement lime mortars. This eliminates easy migration paths for water penetration. Autogenous Healing - When hairline cracks develop in the mortar, hydrated lime reacts with carbon dioxide in the atmosphere.
This reaction produces limestone which helps to seal the crack and fill voids in the mortar. This explains the increased moisture resistance noted after six months of curing in two studies. Good article — thank you. Thanks for posting. This has been a concern of mine since starting to work on some brick buildings from For repointing, masons have suggested mixing N-type with lime in a one-to-two ratio. That mix was popular in the early 20th-century as lime gradually phased out for portland so depending on the age of the home it will be a good fit.
Thank you! A few years ago I learned all about lime mortar and repointed my stone foundation one summer. It had been repointed with cement in the 40s and most of it had popped off. Thank goodness whoever did that did a poor job, because if the repointed joints had been the proper depth it could have caused irreversible damage to the stones. Repointing with lime mortar is no harder than repointing with cement mortar, you just have to search a little to find the right products and you have to make your own mortar mix- and mix it properly.
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