Building Materials, Third Edition

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2w — 2Heavy mortars of bulk density over 2200 kg/m^3 are required for
plastering walls and ceilings of X-ray cabinets. The binding materials are Portland cement and
slag cement, and the aggregates are from heavy rocks in the form of sand (up to 1.25 mm) and
dust. Admixtures containing light weight elements (hydrogen, lithium, cadmium) are added
to enhance the protective properties.

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The particular type of mortar to be used for construction works are given in Table 12.5.

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The motars are tested for their quality by the crushing strength, soundness, and initial and final
setting time tests as discussed in Sec.5.9. The crushing strength of some of the mortars is given
in Table 12.6.