Checking of Concrete Slab Check all the concealed electric conduit work, junctions and electrical points, the positions of fan points, and MS boxes as per your electrical layout plan. Check the reinforcement and get an approval from your RCC consultant. Check the standby arrangements made for water in case of power failure. Consult your RCC … Read more
What are the Types of VG Bitumen As per IS:73-2006 , bitumen is classified into four types based on viscosity, as given below. VG-10 VG-20 VG-30 VG-40 What are the Requirements of Paving Bitumen (VG Bitumen) Characteristics Paving Grades or Viscosity Grade Bitumen Requirements VG-10 VG-20 VG-30 VG-40 Absolute viscosity at 600C, Poises, Min 800 … Read more
Advantages of Viscosity Grade Bitumen Viscosity grade bitumen is based on fundamental engineerin7g properties and not on empirical properties. It is a performance based grading system. Viscosity grading system takes into account both low and high temperature susceptibility of bitumen. Viscosity grade bitumen is very easy to handle as viscosity value at two different temperatures … Read more
Information to be Supplied by The Producer Before supplying any concrete, the producer should provide the following information to the purchaser. Nature and source of each constituent material Source of supply of cement Proposed proportions or quantity of each constituent/m3 of fresh concrete If any admixture is to be used to produce concrete, then following … Read more
Information to be Supplied by the Purchaser It is recommended that a meeting must be held between the purchaser and the producer of concrete. In the meeting the following points should be discussed. Details of concrete mix Use of concrete Type of structure Performance requirement Notice to be given prior to delivery Delivery rate Purchaser’s … Read more
Storing of Cement on Site – Guidelines Store cement in a building which is dry, leak proof and as moisture proof as possible. There should be minimum number of windows in the storage building. Stack the cement bags off the floor on wooden planks in such a way, so that it is about 150 mm … Read more
What is Efflorescence on Plaster Surface? Efflorescence is one type of defect found on plaster surface. Efflorescence is the whitish crystalline substance which appears on the surface of walls due to presence of soluble salts, such as suphates of sodium, calcium and magnesium. Why Efflorescence Happens on Plaster Surface? Presence of salts in the lime, … Read more
Thickness of Plastering Finishing coats (and single-coat work, where employed) should be of such minimum thickness as just to provide a sufficient body of material to harden satisfactorily under the site conditions in any particular case. The total thickness of two-coat work exclusive of keys or dubbing out shall be generally about, but shall not … Read more
Number of Plaster Coats for Different Backgrounds The ideal number of coats, where practicable, is two, namely, the undercoat followed by a finishing coat. It is recognized, however, that much successful work has been carried out in the past with only a finishing coat plaster on reasonably plane backgrounds of brick, concrete and similar materials. … Read more
Blistering The development of one or more local swellings on the finished plaster surface. Cracking The development of one or more fissures not assignable to structural cause. Crazing The development of a series of hair cracks on the finished plaster surface. Known as ‘map crazing’, when it forms a haphazard pattern over the wall surface … Read more
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