by Sunday | Sep 22 | NABTEB QUESTIONS
ANSWER: Tabular scaffolding is preferred because (i) It is lighter in weight. (ii) It is easier to erect and dismantle. (iii) It is more durable. (iv) It is stronger. (v) It is safer.
by Sunday | Sep 22 | NABTEB QUESTIONS
ANSWER: Gypsum in cement helps to retard the setting time of cement, thus allowing the work for which the cement is required to be done before setting and hardening take place. The percentage of Gypsum used is 2%.
by Sunday | Sep 22 | NABTEB QUESTIONS
ANSWER (i) Rapid Hardening Portland Cement: This is made by mixing together chalk or limestone, with clay or shale, heating them to a clinker and grinding them to finer powder than that for ordinary Portland cement. The setting time is similar to that of O.P.C. But it...
by Sunday | Sep 22 | NABTEB QUESTIONS
ANSWER Advantages of flexible joints over rigid joints include: (i) Flexible joints produce the economy of expansion but rigid joints are prone to damage under bad ground conditions. (ii) Rigid joints are usually applied to pipes of smaller bores made mainly of clay...
by Sunday | Sep 22 | NABTEB QUESTIONS
ANSWER Advantages of pitch fibre pipes include: (i) They are used for both domestic and trade wastes. (ii) They are produced in portable nominal length ranges from 1.7m to 3.0m. (iii) They also have nominal standard bores which range from 50mm to 225mm. (iv) They are...
by Sunday | Sep 22 | NABTEB QUESTIONS
(i) Monolithic method. (ii) Separate ANSWER (i) Monolithic method:- This involves laying the screed within three hours of cast-in-situ concrete slab. The mix is prepared in the proportion of 1:1:2 by weight of cement fine aggregate or sand and coarse aggregate. The...