Question

a.Describe plain weave with aerated concrete by drawing it with free hand.
b.How should rough and fine plaster be made? Explain by drawing with free hand.

Answer 1

a) Plain weave is the most basic of three fundamental types of textile weaves (along with satin weave and twill).It is strong and hard-wearing, and is used for fashion and furnishing fabrics.

In plain weave cloth, the warp and weft threads cross at right angles, aligned so they form a simple criss-cross pattern. Each weft thread crosses the warp threads by going over one, then under the next, and so on. The next weft thread goes under the warp threads that its neighbor went over, and vice versa.

Variations of the plain weave include the rib weave, with either warp or filling yarns heavier, as in dimity and bengaline, and the basket weave, in which two or more filling yarns, or a single heavier yarn, pass alternately over and under two or more warp yarns, as in oxford shirting and monk’s cloth.

Fig.1 A pattern of plain weave

b)Rough plaster walls convey a rustic ambience. If the walls are to be modernized and smooth plaster or wallpaper applied, special preparatory work is necessary. The effort is worth it for all who have seen enough on rustic surfaces.

Depending on the condition and thickness of the roughcast, it must be ground evenly or removed completely. Check that the rough plaster is still firmly connected to the wall at all points. If some spots already loosen or if the roughing has a rough feel, it is best to remove it completely from the wall. Every square kilometer of wall space causes several kilograms of building rubble. Before starting work, clarify how to remove the rubble and where to dispose of it properly.

Fig.2 An example of Rough Plaster

Fine plaster always needs a smooth, clean and dust-free surface. In roughing, nicotine, cooking fumes and grease, dust and other contaminants may accumulate over years of use. Apart from hygienic reasons, the fine plaster does not tolerate such a surface and would adhere poorly or not at all. In addition, the surveys on the rough plaster make an even result when applying the fine plaster impossible.

Fig.3 An example of fine plaster