For plastering over a brick wall. External plastering quantity. (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. 6. For Roof plaster mainly ratio we use = 1: 4 (1 part of cement and 4 part of sand). The target w/c ratio can also be selected from available data on the actual materials that will be used. For Roof plaster mainly ratio we use = 1: 4 (1 part of cement and 4 part of sand). 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 3 Given below are some of the important areas where special attention is … 4. An approved water proofing additive shall be … With practice, you will achieve good results. Get Great Results when Using Cement. 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. 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. The masonry surface should be wet before applying the plaster to avoid the absorption of water from the mortar. Curing: For the cement to be strong, curing is very essential. Without water curing, traditional cement plastering will crack and fail, since water escapes when the plaster is applied, due to the porosity. Plastering cement sand Ratio: 1:3 – External wall (in sever climate) 1:4 – External Wall (normal conditions) 1:4 – ceiling plastering The most common mortar mix ratio for wall plastering is 1:6, here 1 part is cement and 6 part is sand in a workable amount of water. Make a slurry of cement and sand in a ratio of 1 part of cement and one part of sand (1:1) and spray over the walls properly before 1 or 2 minutes of starting plastering, it helps to make good bound between wall and plaster. 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%) Do not plaster on concrete without hacking. Checks during plastering. 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. 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 mixing ratio is 1 part cement and 5 parts sand, and if the plaster is too harsh, 0.5 to 1 part of lime can be added. 7. 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) More water, cement or sand can be added if the mixture is too wet or dry. 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. Step 4 : Quantity of water required. On concrete do not do plastering of more than 6mm thickness. Supplementary Mix Water The process of adding supplementary water above mix design water is used to combat substrate absorption and evaporation. Recommended plastering cement sand mix ratio for plastering of plane,rough surface of brick wall, concrete wall and ceiling are 1:6, 1:4, 1:5 & 1:3 are used respectively. Use a mesh while plastering the electric and water pipes. 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. as per the requirements of the work. Kirk Giordano plastering Inc. 929,547 views. Use plastering sand and mix well. That means, one unit cement will be mixed with four units of sand to prepare mortar. Water Cement Ratio means the ratio between the weight of water to the weight of cement used in concrete mix. 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. 18:42. When we add more water (more than 8%) to the sand, the thin film will disappear, and volume decreases. The mortar should be prepared by using the measuring box with a proper water-cement ratio. 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?". The cement mortar should be utilized within an hour after mixing. plastering mixing instructions. The plaster should be in straight line, leveled, plumbed and the joint must be in right angle. In order to calculate the required quantity of cement, sand and water for plastering we have to follow the following 5 simple steps. This shall consist of 2 coats. The thickness of plaster is between = 12 mm to 15 mm. This is for a bathroom brick wall where a door frame used to reside. The thickness of plaster is between = 12 mm to 15 mm. For 100 ㎡ of Wall, first & second coat of cement mortar ratio is 1:5 & 1:3.The quantity of cement, sand & water required for Plastering-then we have :- The Quantity of cement required = 574 kgs The Quantity of Sand (Fine aggregate) required = 2560 kgs The ratio of Cement Mortar for Wall Plastering = 1:6. 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. For wall plaster generally ratio we use = 1: 6 (1 part of cement and 6 part of sand). Adding Bulking of Sand & Wastage. Hi there, I would use a 5-1 ratio of sand to cement and use a good mortar plastisier. PRACTICE AND MATERIALS UNIQUE TO THE PLASTERING TRADE. 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. The plaster is made from sand and cement mix 1: 2. 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. External plastering quantity. The strength can be increased upto 2.0 N/mm2 by decreasing one portion of sand. Cement Mortar. How to Mix small amount of Sand Cement Mortar by hand - … General Notes. 12.4.1 MATERIALS Cement mortar 1:3 or other specified proportion conforming to the requirements of Clause 3:2. Mortar - 1 part cement… 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. 5. Normally water cement ratio falls under 0.4 to 0.6 as per IS Code 10262 (2009) for nominal mix (M10, M15 …. The base coat shall be cement mortar 12 mm thick with a surface coat of coloured cement mortar 6 mm thick. M25) We all know that water cement ratio will directly affect the strength of concrete. Pulverized alum is added at the rate of 12 kg per cubic meter of sand. PPC cement is preferred in place of OPC-grade cement for plastering. Plastering on concrete should be in the ratio of 1:3. The surface is porous and water seeps in instantly. Laying of Plaster. 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… Always use Good quality of cement (Different grades of cement) as well as good quality sand. Then with the help of trowel put mortar over the wall surface properly. What is Water Cement Ratio? We know one bag cement of 50 kilograms contains 1.25 cubic feet of cement. At one go, avoid plastering of more than 12mm thickness. Like that we can calculate the requirement of cement, sand and water for any ratio and thickness of plastering work. The thickness of the Internal Wall Plastering … i.e. ... the fineness modulus is increased by adding coarse sand in the required ratio. April 20, 2019 By Stucco Plastering Leave a Comment. Water-Proof Plaster. Cement : Aggregate : Water ratios. Always use Good quality of cement (Different grades of cement) as well as good quality sand. Equipment: When purchasing the plaster mix at your local Mica store, make sure that you get advice on the correct water-to-mix ratio. Following are a few hints and tips. White cement only needs water unlike the grey cement. Below is an example of a sand to cement mix ratio recommendation from a cement manufacturer. Generally two coats of this mixture is needed to cover the walls evenly. How do you calculate external plaster quantity? 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. Exterior plastering is usually called exterior rendering. Cement plaster is a homogenous mixture of Portland cement, fine aggregates, and water. Cement plastering advise, plastering over concrete walls - Duration: 18:42.