Not recommended. 11. For example, Cement-sand ratio of 1:6 has mortar strength of 30 kg/cm 2 and brickwork strength of 5.5 kg/cm 2, while cement-lime and the sand-mix ratio of 1:1:6 has mortar strength of 30 kg/cm 2 has higher brickwork strength of 7 kg/cm 2. Here, for 1:6 mix, total number of ingredients in the mortar is 6+1 = 7. Mortar should be mixed with water for one hour work so that mortar may be used before setting. Admixture, if any used. Cement sand ratio of mortar should be 1:3 to 1:6 as specified. To get the required proportion, materials of mortar should be measured with the measuring box. We will calculate cement and sand for 100 m 2 plastering area in 1:6 ratio and thickness of 12 mm. To calculate the sand quantity The sum is 1+5 =6. Typical mix ratio for mortar (laying of blocks) is 1:6. For foundations, a mix of 1 part cement to 3 parts sand to 6 parts aggregates can be used. Cement Mortar Required: Plastering thickness 12 mm = 12/1000 = 0.012m. I have achieved 18–21 N/mm2 in 1:6 mortar on 28th day using 53 grade cement, crushed sand and Master Mortar MM101B admixture of Razon. As we know that, 0.39″ mortar thickness is added to brick size. What is the strongest mortar mix? Volume of Each brick = 9″ x 4″ x 3″ = 0.22 x 0.1 x 0.07 = 0.00154m 3. We know that cement mortar is mixture of cement and sand. Materials of mortar should be first mixed dry to have a uniform color. The effect of water/cement (w/c) ratio on the mechanical properties such as compressive strength and split tensile strength of cement mortar cylinders and cubes was investigated experimentally for 28 days curing period as per IS standard.Based upon the experimental results, empirical equations have been developed to predict the strength of cement mortar mixes with various w/c ratios. Cement requirement Quantity of cement required = 1/7 x 1440 kg/m 3 = 205.71 kg Making allowance for shrinkage between fresh and wet concrete = 1.54 x 205.71 = 316.79 kg Quantity of cement required in bags = 316.79/50 = 6.33 bags. Therfore, 2 units of more cement needs to be added to enrich the mortar to the ratio 2:9. Rate should be for the complete work including scaffolding and all tools and plants used. For weak mortar, local fine sand may be used. Volume of cement mortar = 42 unit (given) Ratio of mixing cement to sand = 1 : 6 ∴ The volume of cement = 42 / (1 + 6) = 42 / 7 = 6 units the volume of sand = 6×6 = 36 units. Mortar is a mixture of cement used in the building trade to hold bricks together. Your email address will not be published. 11. A bonding paste prepared by adding a certain quantity of water with cement and fine aggregates is called mortar. Suitable Scaffolding should be provided to facilitate the construction of brickwork. Brickwork should be done for 1 meter or 3 feet height at a time. From above method, we can calculate the quantity of sand, cement and water in mortar. Ratio of mix is 1: 3 in which one part is cement and 3 part is sand. Dry volume of mortar = Wet volume x 1.33. Material of mortar should be of standard specifications. For buildings, we use the following mixes â The mortar mix ratio for most of the 5 inches thick wall in a residential building is done with 1 part cement and 4 parts soft sand mortar mix ratio. Mortar mix is a critically important building component that must be combined thoroughly. For external plaster work, as per Government of India, ‘CPWD SPECIFICATIONS (VOL.-2)’ (Central Public Works Department), the under coat shall consist of cement mortar 1:5 (1 cement: 5 coarse sand) and the top coat shall be of cement mortar 1:4 (1 cement: 4 fine sand) unless otherwise specified. Dry volume of Mortar = 1.54 x 0.2305 = 0.35497 m 3 (54% increment due to volume shrink after adding water) Cement= (0.35497 x 1) / (1+6) = 0.35497/7= 0.05071 m 3. Normally, we used the water-cement ratio falls under 0.4 to 0.6 per IS Code 10262(2009) for nominal mix i.e. Vertical joints of alternate brick layer should come directly over one another. 2.2. Cement mortar is used where high strength is required and water-insulation is required. To calculate the sand quantity The sum of cement and sand gives a 7 parts(1+6) So cement required is (1/7)*1.54=0.22m3 (Where 1.54 is dry to wet volume constant which includes wastage also) If u want in kg multiply it by density of cement ie 1440*.22= 316.8kg To calculate the cement quantity ; The ratio of cement mortar is 1:5. When one part of the wall has to be delayed then stepping should be done at an angle of 45 degree. Mixing should be done at least three times. 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