Site Execution

 WATERPROOFING OF TOILET AREA:- Surface preparation waterproofing work:- • All surface area should be cleaned up to visible hair cracks / aggregate  texture, cleaning of  RCC member should be done by hacking tool, wire  brush, wire grinder & air blower etc. • All visible cracks & construction joints should be sealed with cement  mortar with additive Conplast WL after making V groove. • All clean & treated area should test for water tightness by flooding water for  minimum 75 mm head for 48 hours. All wet spots, water leak & honeycomb areas should be mark for treatment. It shall be treated with injection grouting with Cebex 100 as additive to be added in grout cement slurry @ dosage of 225 gm. of packet per bag of cement or micro concrete. Waterproofing Treatment:- • Ensure the surface must be damped before application of 2 coat of GS flexi 201 by brush. The first coat shall be applied at the rate 1 kg /m2 with proper brush application ensuring that all surface of the co

  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 a uniform rate of 1

  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) including expandable additive as directed by consultant

  HOW TO PREPARE SURFACE FOR WATERPROOFING :-     All surface area should be cleaned well to make visible of hair cracks / aggregate texture and opened the all the joints and construction joints.   Cleaning of RCC member should be done by hacking tool, wire brush, wire grinder & air blower etc. Make sure all kind of dust particles, oil & grease should be removed properly  ·          All visible cracks & construction joints should be sealed with cement mortar with additive Conplast  WL after making V groove.             All clean & treated area should test for water tightness by flooding water for minimum 75 mm head for 48 hours.     All wet spots, water leak & honeycomb areas should be mark for treatment. It shall be treated with        injection grouting with Cebex 100 as additive to be added in grout cement slurry @ dosage of 225         gm.  of packet per bag of cement or micro concrete. ·         Areas to be grouted should be prepared to ensure substrates

Ultrasonic Pulse Velocity Testing is non destructive technique which is used to check the quality of Concrete, In this method of testing we identify internal cracks, voids, strength and compaction quality of the concrete structure.  In this method we find out the velocity of pulse inside the concrete.   The higher velocity shows the good quality and lower velocity shows the bad quality of Concrete.     Velocity can be calculated by formula:-  (V)  =   Distance b/w trns. & rcvr. (L)    /                     Reading of machine or time take                                      by pulse (t) There are three methods of Ultrasonic pulse velocity technique.   1:- Direct Method 2:- Semi Direct Method  3:- Indirect Method 1:- Direct Method:-   This method is more relaibale and accurate. In this method we place the tansducer on one end and on other end we place the receiver. As shown in Image:-  2:- Semi Direct Method:-  This method is not as accurate as direct Method,