Before starting the plaster, the surface should be raked and properly cleaned by wire brush and it should be wet for 24 hours. Supplementary Mix Water The process of adding supplementary water above mix design water is used to combat substrate absorption and evaporation. i.e. On concrete do not do plastering of more than 6mm thickness. April 20, 2019 By Stucco Plastering Leave a Comment. Exterior plastering is usually called exterior rendering. Do not plaster on concrete without hacking. For wall plaster generally ratio we use = 1: 6 (1 part of cement and 6 part of sand). Hi there, I would use a 5-1 ratio of sand to cement and use a good mortar plastisier. Equipment: When purchasing the plaster mix at your local Mica store, make sure that you get advice on the correct water-to-mix ratio. Cement Mortar. (iii) Mix, in succession, each of the amounts of water (5 l, 1 l and 1,5 l) until the mix reaches a consistence suitable for plaster. The target w/c ratio can also be selected from available data on the actual materials that will be used. The cement mortar should be utilized within an hour after mixing. Plastering on concrete should be in the ratio of 1:3. 5. Method-1: DLBD method to Calculate Cement, Sand and Water required for Plaster (1:4) For calculation purposes, lets assume that the area that needs to be plastered is 100 sqft (10 ft X 10 ft wall) and a Plaster of Mix ratio 1:4 (cement:sand) is used. Plastering:-Plastering is done with cement mortar or lime surkhi mortar on the irregular or coarse textured wall, column and ceiling surface to provide a smooth, hard, level finish which can be painted for the shake of appearance. Cement plastering advise, plastering over concrete walls - Duration: 18:42. Pulverized alum is added at the rate of 12 kg per cubic meter of sand. Waterproof plaster is needed for the protection of the masonry wall from the ingress of moisture and thus eliminating or reducing dampness of the wall. what is water cement ratio m10,m15,m20,m25,m30,m35m ,m40.. Answer / yogesh Generally the water cencement ratio varies from 0.4 to 0.8 , It depends on grade of concrete as the grade of concrete increases w/c ratio bcome less. Cement : Aggregate : Water ratios. Like that we can calculate the requirement of cement, sand and water for any ratio and thickness of plastering work. When we add more water (more than 8%) to the sand, the thin film will disappear, and volume decreases. plastering mixing instructions. We normally use the 1:4 ratio of cement and sand in mortar for plastering. Normally water cement ratio falls under 0.4 to 0.6 as per IS Code 10262 (2009) for nominal mix (M10, M15 …. 7. Plastering cement sand Ratio: 1:3 – External wall (in sever climate) 1:4 – External Wall (normal conditions) 1:4 – ceiling plastering The plaster is made from sand and cement mix 1: 2. For plastering over a brick wall. Volume of cement mortar required = ( Plastering Area x thickness ) = 100 m 2 x 0.012m = 1.2 m 3 (This is wet volume of cement mortar (after mixing water) but we need dry volume. ... the fineness modulus is increased by adding coarse sand in the required ratio. To get dry volume consider 35% bulking of sand and 20% wastages = 1.2 m 3 x (1+0.2+0.35) (Rather than 35% sand bulkage and 20% wastage you can add 1.54 as constant) / Archives for water cement ratio for plastering. The ratio of Cement Mortar for Wall Plastering = 1:6. 12.4.1 MATERIALS Cement mortar 1:3 or other specified proportion conforming to the requirements of Clause 3:2. Adding Bulking of Sand & Wastage. Plastering a wall, whether old or new, is not as difficult as it may seem. What is Water Cement Ratio? Meaning of mix 1:3 mortar – in this mix ratio of cement and sand in which one part is cement and 3 part is sand and by adding water. The strength of 1:6 ratio of mortar after 28 days is 3.0 N/mm2. White cement only needs water unlike the grey cement. Mortar - 1 part cement… Laying of Plaster. Without water curing, traditional cement plastering will crack and fail, since water escapes when the plaster is applied, due to the porosity. The thickness of plaster is between = 12 mm to 15 mm. The standard mix of the white cement requires to mix the white cement with water in the ratio of 2:1 proportions of water and white cement. General Notes. Cement plaster can be used on most types of walls, except it does not adhere well to soil-block walls as the shrinking and swelling tend to crack the plaster. PPC cement is preferred in place of OPC-grade cement for plastering. A water cement ratio of 0.5 : 1 (water : cement, by weight) recommended for ferrocement construction is ideally situated for the mortar mixes used in the construction of wire-reinforced-cement mortar tanks too. Following are a few hints and tips. Water Cement Ratio means the ratio between the weight of water to the weight of cement used in concrete mix. Concrete - 1 part cement, 2 parts concreting sand and 3 parts 20 millimeter aggregate. Use a mesh while plastering the electric and water pipes. Get Great Results when Using Cement. Below is an example of a sand to cement mix ratio recommendation from a cement manufacturer. 3 Given below are some of the important areas where special attention is … M25) We all know that water cement ratio will directly affect the strength of concrete. An approved water proofing additive shall be … Always use Good quality of cement (Different grades of cement) as well as good quality sand. For 6 mm thick plastering in RCC, the quantity of dry mortar may be taken as 1.00 cu m. Also, Read – Rate Analysis for Gypsum Plaster. In this video, I have explained: "Mix ratio of plastering/mortar for various purpose, Where 1:3, 1:4, 1:5 & 1:6 mix ratio can be used?". Step 1:- Assumptions Area of Plaster = 100 m² Thickness of plaster = 12 mm =0.012 m Mix Ratio → 1:4 Step 2:- Volume of Plaster ∵ Volume of plaster = Area… The plaster should be in straight line, leveled, plumbed and the joint must be in right angle. Water-to-cement ratio The maximum water-to-cement ratio may be established by the customer or authority having jurisdiction based on anticipated exposure conditions. Generally, OPC 43 and OPC 53-grade cement is mixed with sand (the fine aggregate) in different proportions; hence, this plaster is also called as the cement-sand plaster. The base coat shall be cement mortar 12 mm thick with a surface coat of coloured cement mortar 6 mm thick. The masonry surface should be wet before applying the plaster to avoid the absorption of water from the mortar. The thickness of plaster is between = 12 mm to 15 mm. Quantity of water required is 20% of Total dry material (Cement & sand) Quantity of water = 20% (weight of cement + weight of sand) = 20% (245+1978) = 445 kg = 445 ltr. The ratio of Cement Mortar for Ceiling Plastering = 1:4. We know one bag cement of 50 kilograms contains 1.25 cubic feet of cement. Volume of cement mortar required = ( Plastering Area x thickness ) = 100 m 2 x 0.012m = 1.2 m 3 (This is wet volume that means we need this much volume of cement mortar after mixing water, So for dry volume, we have to add 30-35% as bulkage of sand, we are using 35% and wastage as 20%) For Roof plaster mainly ratio we use = 1: 4 (1 part of cement and 4 part of sand). Cement Mortar Ratio = 1:3 (1 Part Cement : 3 Part Sand) Required volume of Cement Mortar = plastering area x plastering thickness = 100 x 0.012 = 1.2 m 3. CEMENT - SAND - STONE relationship; In practice a 50kg of cement bag contains 2 head pan of cement; this means that if i have a plan to mix 1 bag of cement my mixing ratio would be: 1:2:4 = 1 bag of cement : 4 head-pans of sand : 8 head-pans of stone 1:3:6 = 1 bag of cement : 6 head-pans of sand : 12 head-pans of stone This shall consist of 2 coats. Step 4 : Quantity of water required. How to Mix small amount of Sand Cement Mortar by hand - … Water-Proof Plaster. How do you calculate external plaster quantity? The surface is porous and water seeps in instantly. For Roof plaster mainly ratio we use = 1: 4 (1 part of cement and 4 part of sand). 4. 5 kg of cement 25 kg of dry sand 5 kg (l) of water 1 kg (l) of water 1,5 kg (l) of water (ii) Mix the cement and sand to a uniform colour on a non-absorbent surface.