Why cement mortar need to be consumed within 30 min just after it is mixed? Cement mortar is a mixture of cement, sand, and water used for various construction purposes such as plastering, masonry, and laying bricks. The reason why cement mortar needs to be consumed within 30 minutes after its preparation is due to … Read more
Mortar is a homogeneous mixture, produced by intimately mixing cementitious materials, water and inert materials, such as sand, to the required consistency for use in building together with masonry units.
Properties of Mortar Properties of mortar which are sought for use in masonry are: workability, water retentivity, rate of stiffening, strength, resistance to rain penetration and durability. These properties have been discussed below explaining their effect on masonry. Choice of masonry mortar is governed by several considerations such as Type of masonry unit and its … Read more
Technical Properties of Mortar For the sake of projects, the newly mixed mortar should have good workability, and the hardened mortar should have the required strength, the bending power to the bottom face, little deformation and durability. 1. Workability of Fresh Mortar The workability of fresh mortar refers to the comprehensive properties of mortar easy … Read more
Flow Table Test for Cement Mortar The flow table test of cement mortar is done only to calculate the amount of water required for gauging for conducting strength test of masonry cement and for drying shrinkage test of cement. It also gives us some idea on the workability of cement mortar. The amount of water … Read more
Characteristics of Good Mortar The chief properties of hardened mortar are strength, development of good bond with building units, resistance to weathering and those of green mortar mixes are mobility, placability and water retention. In addition, the mortar should be cheap and durable and should not affect the durability of building units in contact. The … Read more
Purpose Water retentivity of mortar is the ability of mortars to retain water against suction and evaporation in general. It is indirectly a measure of the workability of mortars. Apparatus The apparatus used for this test consists of a water aspirator or other source of vacuum controlled by way of a three way stopcock to … Read more
Principle for Supervision of Stone Masonry The following principles should be followed during construction of stone masonry: The stone used in masonry should be durable and strong. All stones should be well watered before laying to avoid absorption of moisture from mortar. All stones should be properly dressed. The stones should be laid on their … Read more
Why to Use Clean Sand for Mortar? Contaminated sand will not bind with cement, hence is weakening the mortar. Also sand with high percentage of clay or silt will weaken the mortar, because the clay or silt contains too many fines that needs to be covered by cement for proper binding. Why Use Fresh Cement … Read more
What is Mortar? It is a plastic mixture of binding material (like cement, lime, etc), fine aggregates (like sand, surkhi, etc), water and any admixture approved by the engineer in-charge. This is used to bond masonry or structural units. There are different types of mortar used in construction industry. The following are the type of … Read more