A good mortar would hang from the trowel and will flow down readily when lightly jerked. Properties. Mortar is a paste formed by the addition of water to the mixture of binding material and fine aggregate. Deformability of Mortar. The proportion method is simply a mortar recipe or certain volumes of cementitious materials and aggregate combined with water that gives a workable mix. Lime mortar does not adhere as strongly to masonry as Portland cement. Therefore, bond between mortar and masonry is more important than compressive strength of mortar. Different mixtures provide different characteristics, such as compressive strength, flexibility, and bonding properties. A good quality mortar has strong water retention capacity. Not be confused with cement, concrete, or grout, Mortar is a specific material made for specific purposes. 6. 3. Properties of Good Mortar Mix and Mortar: The important properties of a good mortar mix are mobility, place-ability and water retention. You can follow me on Instagram. Composite cement-lime mortars are well known for their good workability and have some other desirable properties. Lost your password? Lime mortar physical properties are determined by their workability or plasticity, water retention, air content, uniformity, band strength, minimize water penetration, durability, elasticity, auto genius healing, compressive strength, and Freeze-Thaw Durability. sir. Workability is the behaviour of a mortar in respect of all the properties required during application, subsequent working and finishing. When a mortar is said to be good mortar it should obey the following properties: © 2009-2020 The Constructor. Some indications of workability are: The mortar spreads easily with the trowel; the mortar … Also, the developed mechanical properties at 3 hours of curing time for MPC mortar reinforced with fibers are comparable to that at 28 days for ordinary Portland cement (OPC) mortar. 2. These properties of bricks include shape, size, color, and density of a brick. The consistency of a mortar is indicated by the term mobility. am i santhosh .. what a knowldge.. sir .. Hatsof to u i am also civil engg ..Pls give a permissiom i join this blog followers and u.. i have a some doubts.. From structural considerations it is necessary that masonry should attain the requisite strength by the time loads are imposed on it. Properties of Good Mortar Ingredients. It uses light aggregates like pumice. Also Read: How to do Flow Table Test of Cement Mortar, Also Read: Quality Requirements of Good Mortar. It also provides water lightness against the weather. To some extent workability depends upon consistency of mortar which is measured by recording depth of penetration of a standard cone as detailed in IS 2250 : 1981. The standard shape of an ideal brick is truly rectangular. HOW TO INCREASE REPETITION VALUE OF PLYWOOD? In most cases, adding one part cement to two parts sand will yield a proportional cement mortar volume. mortar is mixture of cement sand and water in which cement is binding agent. Mortar is a workable paste which hardens to bind building blocks such as stones, bricks, and concrete masonry units, to fill and seal the irregular gaps between them, spread the weight of them evenly, and sometimes to add decorative colors or patterns to masonry walls. This process, known as maturing, allows particles to swell up time to time. Sorry, your blog cannot share posts by email. The consistency is categorized into different types as stiff, dense, loose, fluid etc. Sorry, you do not have permission to ask a question, You must login to ask question. Well graded fine aggregate should be used. 2. Most of the masonry units have normally appreciable suction, depending on their porosity and moisture content and they begin to suck moisture from mortar as soon as these come in contact with mortar. A good mortar would hang from the trowel and will flow down readily when lightly jerked. It should be borne in mind that if masonry in any situation remains generally dry, sulphates, even if present in brick or sand in excessive quantity, cannot cause much damage. Under the property requirements of ASTM C-270, however, cement-to-sand proportions for the job mixed mortar are to be in the range of 1:2¼ to 1:3½, and the mortar must be pre-tested in the laboratory before the job begins. To know more about me just visit AboutMe. In case of common brick which has water absorption of about 20 percent, suction rate of units is reduced by pre-soaking or pre-wetting of the units. lt should therefore, contain adequate proportion of portland cement, and sand should be well graded. 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Workability of such a mortar can be improved by either adding lime or chemicals known as plasticizers. With that in view, 28-day strength of a mortar is taken into consideration. Geotechnical-Material Engineer. For this reason, as a general rule, cement mortar should not be leaner than 1:5 and cement lime mortar leaner than 1: 1/2 : 4.5. 1. First, with mixer running, add most of the water and half the sand. Lime when used in the form of putty, gives better workability than when used in dry hydrated form. For this reason, mud mortar is considered suitable only for use in superstructure of temporary or semi-permanent buildings with very light loadings. Your email address will not be published. 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