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Engineering and Construction Assignment

3. 25 H 20 -6-200 B1 is the bar call up code, in this 25 is the bar no, H is the bar type/Class, 20 is the bar diameter, 6 is the earmark on the respective drawing, 200 is the spacing between the bars in mm and lastly B1 is the suffix. 4. The basic philosophy behind the bar shapes is to standardize the bending and shape process, this is done for several reasons, firstly this is done so that the reader or the working person should know what are the angles between the shapes, then what is the total length of the bar as we are well aware that the bending will cause a change in length that is reduced in the bend. Then the designer does so to facilitate the workers and the contractor, because a unusual shape might be very difficult to fabricate and will require additional cost and time. 5. There are several ways to maintain the clear cover in concrete; this normally depends on the type of component we are concreting. The spacer plates/ bars are attached to the reinforcement in between the shuttering and steel. Then another spacer way is to provide the spacer chairs, and lift the mesh of the reinforcement to a desirable height. Another way is to provide plastic sheeting and metal tip spacer chairs. 6. ...
t soak as much water as it can, this results into filling of all the pores in the aggregate and then after this the aggregate are dried from the surface so that no additional water remains on the surface. This condition of the aggregate is of vital importance, as we know that dry aggregate

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soak water so when they are used in directly in concrete they will absorb the water of the concrete which was supposed to be used in the hydration of cement and concrete as whole, eventually we have to increase the water cement ratio, but this ratio is almost impossible to maintain. Where as if the due required water is not provided this will result into lesser ultimate strength and the concrete might have microcracks in it. On the other hand if the saturated aggregates are not surface dried then this will firstly result into increase in water which will decrease the strength of the concrete and secondly there will be a water film that will be developed at the surface of the aggregate and the due bond between the cement and the aggregate will not be developed. 8. The form should be cleaned before the concrete is to be poured. The reason for this primarily is simple but very important in essence. The primary reason is that any unrequired material in the form will be added to the concrete hence disturbing the mix design and eventually disturbing the strength of the concrete. Secondly of the is some material in the formwork and when the concrete is poured this material clings with the surface of the concrete. This will affect in two adverse ways firstly there is chance that the clear cover is breached and the reinforcement might be naked when the alien material is taken off, secondly the due required smooth surface of the concrete will not be acquired, resulting into additional cost on
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Summary

1. The type R signifies that the bar used for the link is the Plain Round Bar of Grade 250. The latest British Standards dictate other types which are R type for Ribbed bars of Grade 500 and S for Stainless steel. 2. The cover is provided so that the interaction of the steel with the environment can be reduced and to protect the steel reinforcement from corrosion and rusting…
Engineering and Construction Assignment
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