Following are the factors affecting properties of mortar: The strength and extent of the bond are affected by many variables of material and workmanship. Complete and intimate contact between the mortar and the unit is essential, Workability influences the ease with which the mortar spreads and covers the surfaces. Rough units have a very porous(…)
Building materials provides information on various modern construction materials that are used these days. It also gives information about aggregates, cement, bricks, woods, reinforcement, light weight aggregates, recycled aggregates and other modern materials used in construction industry.
Types of of Mortar as binding material: The kind of binding material for a mortar is selected by keeping in mind several factors such as expected working conditions, hardening temperature, moisture conditions, etc. According to the kind of binding material, the mortars are classified into the following five categories: i. Lime mortar ii. Surkhi mortar (…)
Selection of Mortar for Various Works Different grade of mortar is required for different nature of work. Special types of mortars are required under special conditions. Following table shows the types of mortars required for various works: Sl. No. Nature of work Type of mortar 1. Construction work in waterlogged areas and exposed positions Cement(…)
Special mortars: Following are tile various types of special mortars which are used for certain conditions: 1. Fire-resistant mortar 2. Lightweight mortar 3. Packing mortar 4. Sound-absorbing mortar 5. X-ray shielding mortar 1. Fire-resistant mortar: This mortar is prepared by adding aluminous cement to the finely crushed powder of fire-bricks. The usual proportion is 1(…)
The essential requirements of building stones used for structural work are given below: Strength Ordinarily, the strength of a stone is not of primary importance, as very often the loads to which it is subjected in a structure are much below its permissible crushing strength Durability Stones should possess a natural durability to withstand the(…)
Damp proof course (DPC) is a barrier of impervious material built into a wall or pier to prevent moisture from moving to any part of the building. Following are the materials generally used for damp proofing of structures: 1) Flexible Materials: The materials, which do not crack and deform their shape when subjected to loading,(…)
Fine aggregates affecting concrete mix design strength Gradation of fine aggregates The gradation of sand is given by sieve analysis. The sieve analysis is done by passing sand through a set of standard sieves and finding out cumulative passing percentage through each sieve. The IS 383 – 1970 -Table 4, (clause 4) classifies fine aggregates(…)
Concrete is a mixture of cementitious material, aggregate and water. Aggregate is commonly considered inert filler, which accounts for 60 to 80% of the volume and 70 to 85% of the weight of the concrete. Although aggregate is considered inert filler, it is a necessary component that defines the concrete’s thermal and elastic properties and(…)
Alternate building materials are those which can be used economically by replacing the conventional building materials. Alternate building materials are made from waste products and thus it even minimizes environmental pollutions.