Site Execution

  Apparatus: ž   A compression testing machine, the compression plate of which shall have a ball seating in the form of portion of a sphere the center of which coincides with the center of the plate, shall be used. ž   Preconditioning:  Remove unevenness observed in the bed faces to provide two smooth and parallel faces by grinding. Immerse in water at room temperature for 21 hours. Remove the specimen and drain out any surplus moisture at room temperature. Fill the frog ( where provided ) and all voids in the bed face flush with cement mortar ( 1 cement, clean coarse sand of grade 3 mm and down ). Store under the damp jute bags for 24 hours followed by immersion in clean water for 3 days. Remove, and wipe out any traces of moisture. Procedure: Place the specimen with flat faces horizontal, and mortar filled face facing upwards between two 3-ply plywood sheets each of 3 mm thickness and carefully centred between plates of the testing machine. Apply load axially at ...

  GROUTING PROCEDURE OF RETAINING WALL:-   Construction & Honeycomb Treatment:-        Chasing open the joints in ‘’V’’ shape/ ‘’U’’ shape groove of required width and depth as per site conditions. Chasing open the junction of RCC and the masonry surfaces, sealing the groove with repair mortar C:M with Conplast WL equivalent @ 150 ml per bag of cement etc.    The minimum dosage is 125ml and the maximum is 200ml per 50kgs of cement. If maximum dosage is used a minimum of 15% water should be reduced to ensure no loss in strength. The required quantity of Conplast WL is measured and stir into the first or second bucket of water. Conplast WL water mixture shall be added to the concrete or mortar and mixed thoroughly. Mixing shall be continued and further water shall be added until the required work ability is obtained. Grouting:- Cementious Grout:- ·     Providing and applying neat cement slurry grouting (Cebex 100) includ...

Concrete :- Concrete is a composite material defined as the mixture of cement, sand, coarse aggregate and water. Which is used for construction of building, infrastructure etc. The function of ingredients of Concrete:- 1:- Cement:- Cement is the most important ingredient of concrete. It is used to bind the aggregates, fine sand and coarse sand. 2:- Water :- Water is used for the lubrication of the aggregates and to cause chemical action with the cement called hydration. Water used in concrete should be potable without any inpurities. Clean water should be used in concrete. 3:- Fine Aggregates:- The aggregates which can pass through the IS sieve No. 4.75 are called fine aggregates. It's used to make concrete dense by filling the the voids and gaps of coarse aggregate and also to reduce the shrinkage of the cement on hardening. The use of the fine aggregates to make the concrete mix economical. 4:- Coarse Aggregates:-   The aggregates which pass ...

Cement:-  Cement is a building material, which is used as a binding material in construction work. It has cohesive and adhesive properties. Types of Cement   Pozzulana Cemen White Cement White Cement Quick Setting Cement Rapid hardening Of Cement Low Heat Cement  Expanding Cement High Alumina Cement Blast Furnace Cement Acid Resistant Cement Sulphate Resistant Cement Fly ash blended Cement 1:-  Pozzulana Cement :  Pozzulana is a volcanic power found in Italy. It can be processed from shales and certain types of clay also. In this cement pozzulana material is 10 to 30 per cent. It can resist action of sulphate. It releases less heat during setting. It imparts higher degree of water tightness. Its tensile strength is high but compressive strength is low. It is used for mass concrete works. It is also used in sewage line works.   2:-    White Cement :  The cement when made free from colouring oxides of iron, maganese and chloriu...