It is necessary to check the quality of cement on site at the time of preliminary inspection. It is not possible to check all the engineering qualities of cement on site but there exist some field test which gives us a rough idea of quality of cement. While on site we can perform these field … Read more
Floors are one of the important parts of a house. It should have a pleasing appearance and should attract the attention of people. Floors should also be durable, easy to maintain. If proper care is taken during floor construction then it will have longer life period and will require less maintenance. Precautions to Follow During … Read more
Advantages of Welding Joints No hole is required for welding, therefore no reduction of area. So structural members are more effective in taking the load. In welding extra plates (like filler plates, gusseted plates, connecting angles etc,) are not used, which leads to reduced overall weight of the structure. Welded joints are more economical as … Read more
Why to Use Clean Sand for Mortar? Contaminated sand will not bind with cement, hence is weakening the mortar. Also sand with high percentage of clay or silt will weaken the mortar, because the clay or silt contains too many fines that needs to be covered by cement for proper binding. Why Use Fresh Cement … Read more
Steels should be stored in such a way, so as to avoid distortion and to prevent deterioration and corrosion. Steels of different classes should be stored separately. Follow the guidelines given below while storing steel on site. Storing of Steel Reinforcement Store bars of different classes, sizes and lengths separately to facilitate issues in such … Read more
While sampling cement from a lot (consisting of a number of cement bags), the lot is divided into a number of sub-lots. Number of sub-lots into which a lot is to be divided is depends upon the weight of the lot. Use the following table while dividing the lot into sub-lots. Weight of the lot … Read more
Packing and Marking of Aggregate Sample Before dispatching, each sample of aggregate is packed separately in such a way so as to prevent loss of any fine material. Use container or sample bag to pack coarse aggregate. Use tight container or closely woven bags to pack fine aggregate and all-in-aggregate; so that there is no … Read more
Sampling of Fresh Concrete To ensure it is representative of the whole truck load, a standard sample consists of scoopfuls taken from different parts of the batch and collected in bucket. Scoopfuls must be taken through the moving stream, as the load is discharged, sampling the whole width and depth (not just the top part). … Read more
Objective Determination of unit weight or bulk density and void of aggregates. Equipments Name Capacity 1. Balance Sensitive to 0.5% of weight of material 2. Cylindrical metal measure Of 3 litre capacity (for fine aggregate) Of 15 litre capacity (for aggregate upto 40mm) 3. Tamping rod 16 mm dia. and 60 cm long Sample Preparation … Read more
Sand Sample Reduction Using Sand Splitter Sand splitter is the accepted method for fine aggregate that is drier than the saturated-surface-dry condition. As a quick check to determine this condition, if the sand remains the shape that is molded in the hand, the sand is considered wetter than saturated-surface-dry. The sand splitter is a small … Read more