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Showing posts with label Concrete Mortar. Show all posts
Showing posts with label Concrete Mortar. Show all posts

Thursday, December 6, 2018

Uses and benefits of dry pack mortar in job site

Dry pack mortar also known as deck mud or floor mud, is formed by blending sand, cement, and water. It’s application is found in repairing small spots, developing thick bed mortar for tile and brick placement, and bed shower setting up.

The proportion of the mixture is done with one part of cement to four part of sand, and sufficient water is required to form mortar that bind together while it is molded into a ball manually.

After being added, the ball shall not decay due to low water quantity and should not slump because of to high-water proportion. This mixture is supposed to produce a compressive strength of 21 MPa.

Dry Pack Mortar – usages and benefits

Mixture Proportion: It is found that one part of cement to four part of sand, desirably sharp clean sand, is sufficient. Further, mix proportions like one to two and half, and one to five or even six are recommended.

Mixture Proportion: It is found that one part of cement to four part of sand, desirably sharp clean sand, is sufficient. Further, mix proportions like one to two and half, and one to five or even six are recommended.

In terms of quantity of water, it is based on the moisture content of the sand being utilized. When moisture of sand is low, larger quantity of water is required in respect to where moisture content is high.

1. Developing ordinary thick mortar beds.
2. Leveling of concrete surfaces up to 51 mm thick.
3. Suitable for floating shower bases.
4. It is directly connected or applied as a isolated floating mortar bed over a cleavage membrane or waterproofing membrane.
5. Suitable for both residential and commercial applications in dry and wet areas.

6. The purpose of dry pack mortar is to fill deep holes in a concrete wall. When the dry pack mortar components are blended, it should be arranged in layers of 10mm and then compressed with hammer, stick, or hardwood dowel. Instead of wooden stick, the metal stick should be utilized to compress dry pack mortar since metal stick produces greater compaction and as well as bond. Besides, it is direct tamping should be employed at an angle to the sides of the hole to maintain good compaction at the sides of the hole.

Benefits of Dry Pack Mortar

1. Applicable for Interior and Exterior applications
2. Mixing of sand and cement in construction site is not necessary
3. It is easily tamped, compacted, and sloped
4. It ensures a consistent mix on large jobs


Uses and benefits of dry pack mortar in job site

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Published By
Rajib Dey
www.constructioncost.co
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Tuesday, November 27, 2018

How to repair concrete with Dry Pack Mortar Method

The purpose of dry pack mortar is to repair the concrete surfaces with cracks or holes of depth greater than or equal to the minimum dimension of the repair area. The holes usually discovered on concrete surfaces are cone bolt holes, she bolt holes, holes formed with ties etc.

Dry pack mortar should not be used for shallow cracks, fully extended holes i.e., from one side to other side, space behind reinforcement etc.

Dry pack method involves the following steps for executing repairing work to concrete.

1. Arrangement of Hole Inner Surface
2. Arrangement of Dry Pack Mortar
3. Using Dry Pack Mortar
4. Curing of Dry Pack Repair Area


1. Preparation of Hole Inner Surface

a. Prior to use dry pack mortar, the surface or hole to be repaired should be cleansed, washed and dried perfectly. Also they should not contain any damaged pieces of aggregates.
b. The inside surface of hole should have been rough to create superior bond. If the surface is smooth, it should be roughened with tapered reamer or star drill.
c. Usually, there exist three methods to develop the inside surface area of holes for maintaining superior bond with dry pack mortar.


Method – 1

a. Bonding grout is used to brush the inside surface of hole. Bonding grout is made of cement and fine sand in the proportion 1:1.
b. Now, the dry pack mortar is applied prior to bonding mortar becomes dry to make superior bond among mortar and surface.
c. When bonding grout is used, ensure that no free surface water exists in the hole so that the hole remains fully dry.


Method – 2

a. By applying wet rags or burlap, the hole is pre-soaked all night with and permitted to dry.
b. When the hole is partly dried or comprises of some amount of surface water, then spray dry cement on to the surface with small brush.
c. The cement will consume free water and develops a layer on the surface. Extra cement still in dry form is eliminated with jet of air so that dry pack can be applied on the surface.


Method – 3

a. Under this method, superior bond among dry pack mortar and surface is formed with epoxy bond resins
b. Epoxy resin is blended and used on the surface with brush.
c. Ensure that the concrete temperature should not exceed at the time of using epoxy or else it may burn or dry up the epoxy promptly.
d. As soon as epoxy is used, instantly use the dry pack mortar prior to epoxy gets dried out.
e. Epoxy bond resin can resist the hydration of water to adjacent concrete surface.


To get more details about dry pack mortar, go through the following link theconstructor.org
How to repair concrete with Dry Pack Mortar Method

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Published By
Rajib Dey
www.constructioncost.co
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Tuesday, February 13, 2018

Some handy tips to find out the compressive strength of mortar

It is advisable to apply 2 inch or 50mm cubes as stated by ASTM C109 / C109M – Standard Test Method for Compressive Strength of Hydraulic Cement Mortars to define the compressive strength of mortar.

Mortar is a formed by amalgamating cement, sand mixed with water. Application of mortar is found in masonry works like brick masonry and stone masonry and for plastering walls, columns etc.

Mostly utilized mix ratio of mortar in masonry works range from 1:3, 1:4 and 1:6 of cement to sand ratio. For vital masonry structures like brick walls, 1:3 ratio is applied.

Why Compressive Strength Test of Mortar is Important?

Usually masonry structures are built up as load bearing. As for instance, load bearing walls, load bearing masonry columns etc. are developed for residential and other masonry buildings. For a masonry buildings, foundations are also built up with brick masonry.

Towards a load bearing masonry construction, vital fact is to recognize the compressive strength requirement of masonry to resist the load that operates on it. A masonry wall is likely to deal with compressive loads from floors over it and should contain adequate strength to resist it. Therefore, masonry compressive strength should have been adequate to support the loads on wall.

How to find out the Compressive Strength of Mortar

To determine the compressive strength of standard cement sand mortar cubes, the following apparatus and methods of the test are undertaken :-

Apparatus: 7.06cm cubes moulds (50cm2 face area), apparatus for measuring and blending mortar, vibrator, compression testing machine etc.

Method for checking Compressive Strength of Mortar
Choose 200gm of cement and 600gm of standard sand in the mix ratio 1:3 by weight) in a pan.


The standard sand is made of quartz, of light, gray or whitish variety and does not contain silt. The sand grains is like angular, the shape of grains is similar to the spherical form, extended and flattened grains are found in very small quantities.

Standard sand passes across 2 mm IS sieve and is kept on 90 microns IS sieve with the particle size distribution as given below.

For more information, go through the following link dssekamatte.blogspot.in

Some handy tips to find out the compressive strength of mortar


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Published By
Rajib Dey
www.constructioncost.co
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Thursday, August 31, 2017

Definition of M20 grade of concrete

In construction, there should be individual strength for each building element.
To maintain the strength of concrete for different elements, various types of concrete grades are required. The strength needed for foundation, beam, slab etc. will be different.

IS 456-2000 has specified the concrete mixes into a number of grades as M10, M15, M20, M25, M30, M35 and M40. In the following construction video tutorial, brief explanation is given on M20 grade of concrete.
In M20, M denotes Mix and 20 refers to the characteristic strength (fck) of that mix i.e. 20mpa. Cement, sand and aggregates are used for mixing in the ratio of 1 : 1.5 : 3. M20 signifies mixture of cement, sand and aggregate which are prepared in such a manner that a cement concrete cube of size 15 cm x 15 cm x 15 cm is formed with characteristic strength (fck) of 20mpa while examining it after being cured for 28 days.
The characteristic strength (fck) signifies the strength under which not over 5% of test results are predictable to fail.
Cement is always calculated with weight. Commonly it is applied in terms of bags. The weight of one bag of cement is 50 kg and it contains a volume of 35 litres (or, 0.035m3). A gauge box is employed for batching of fine and coarse aggregate by volume.

To get more brief information, watch the following video tutorial.

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Published By
Rajib Dey
www.constructioncost.co

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