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Mortar is a workable paste which hardens to bind building blocks such as stones, bricks, and concrete masonry units, to fill and seal the irregular gaps between them, spread the weight of them evenly, and sometimes to add decorative colours or patterns to masonry walls.
2 Code of practice for preparation and use of masonry mortar IS 2250 - 1981 (E) Cement Concrete; 1 Specification for coarse and fine aggregate. IS 383 - 1970 2 Specification for compressive strength, flexural strength IS 516 - 1959 3 Code of Practices for plain and reinforced concrete etc. IS 456 – 2000 4 Methods of sampling and analysis of ...
It has been common since the widespread availability of Portland cement to see London stock brickwork repointed using much stronger cement mortar. As repointing consists of replacing the outer 20–40 mm of mortar, the effect of this is to make the outer 20–40 mm of the brickwork harder and stronger than the interior of the wall.
In masonry, mortar joints are the spaces between bricks, concrete blocks, or glass blocks, that are filled with mortar or grout. If the surface of the masonry remains unplastered, the joints contribute significantly to the appearance of the masonry. [ 1 ]
In restoration masonry, the bits of shell are sometimes exaggerated to give the viewer the impression of authenticity. Unfortunately, these modern attempts often contain higher than necessary ratios of Portland cement. This can cause failures in the brick if the mortar joint is stronger than the brick elements.
In masonry, sulfates produced by the oxidation of pyrite in clay materials can be present in bricks. They are gradually released over a long period of time, causing sulfate attack of mortar, especially where moisture movement concentrates the sulfates. [4] Seawater: sulfate is the second anion present in seawater after chloride.
Recent work on aging of lignocellulosic materials in the cement paste showed hydrolysis of hemicelluloses and lignin [24] that affects the interface between particles or fibers and concrete and causes degradation. [25] Bricks were laid in lime mortar from the time of the Romans until supplanted by Portland cement mortar in the early 20th century.
Concrete may be considered waste according to the European Commission decision of 2014/955/EU for the List of Waste under the codes: 17 (construction and demolition wastes, including excavated soil from contaminated sites) 01 (concrete, bricks, tiles and ceramics), 01 (concrete), and 17.01.06* (mixtures of, separate fractions of concrete ...
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