Construction Technology

  Image Source:-civilread.com It is the time when water is added to cement and the time at which needle of 1mm 2 section fails to penetrate the depth block to a depth of 5 to 7 mm from the bottom of mould. Important Terms:- (i) Take 0.85P of water. (Where, P is normal consistency) (ii) 1mm 2  needle is used. (iii) Penetration should be 5 to 7 mm from bottom. (iv) Mixing, placing and testing should be done between 3 to 5 mm. Recent Post:- Aggregate Impact Value Test Test Procedure:- Image Source:civilblog.org (i) 400 gm of cement sample is taken. (ii) 0.85 P=(0.85 P X 26/100) X 400                 = 88.4 CC (CC-Cubic Centimeter)                                   (1 cc=1 ml) Image Source:aust.edu Also Read: Consistency Cement of Test (iii) 88.4 ml water is mixed and filled in the mould. (iv) 1mm 2  diameter of plunger is fixed and at bottom of vicat ...

Normal Consistency- It is defined as the percentage of water by weight of cement which produces a consistency which permits a plunger of 10 mm diameter to percentage up to a depth of 5 mm to 7 mm above the bottom of vicat's mould. Image Source:-www.civilread.com Recent Post:- Aggregate Impact Value Test Important Terms:- (i) Diameter of Plunger=10 mm (ii) Firstly, 25% weight of water is used which will mix with cement. Then used 26%, 27% and more. Image Source:-civilblog.org (iii) Repeat this procedure till reading not comes 5 mm to 7 mm. (iv) Entire mixing and filling of the mould including testing should be completed within 3 to 5 minutes. Test Procedure:- Image Source:-aust.edu Also Read: Elongation Test of an Aggregate (i) Take 400 gm of cement sample. (ii) 25% water i.e. 400X25/100=100 gm of water is added and mix properly. (iii) After mixing it is kept in mould and also kept on the vicat apparatus surface. (iv) 10 mm diameter needle will just touch on the surface of the mou...

  Image Source:Indiamart.com Aggregate Impact Value is an important test of aggregate. Before starting any mix design and making concrete, we will done aggregate impact value test. From this test we know about the toughness of an aggregate. After apply sudden impact on aggregate, then we got the impact value of an aggregate. Important Terms:- (i) Weight of Impact value testing machine=45 to 60 kg. (ii) Cylindrical Steel cup, Dia.=75 mm, Depth=50 mm (iii) Testing cup, Dia.=102mm, Depth=50 mm (iv) Fall(means height)=380+-5mm (v) Used 12.5 mm and 10 mm-GI Sieves and another 2.36 mm-Brass Sieves Image Source:Indiamart.com Recent Post: Elongation Test of an Aggregate Test Procedures:- (i) Taken some sample of aggregate and used 12.5 mm sieve for passing and 10 mm for retaining.(Note-Sieving will always in circular motion.) (ii) Firstly passing materials of aggregate from 12.5 mm IS sieve and then 10 mm IS Sieve is used. The material which will retained on 10 mm sieve will kept in anothe...

Elongation tes t is an important test of an aggregate. Because, aggregate is an important ingredient of concrete. Aggregate is how much elongated, it will acceptable or not as per their acceptance criteria, it will known by elongation test. I am representing here elongation test of an aggregate. Image Source:Amazon.in Elongation Index :-If aggregate least dimension is greater than 4/5th or 0.8 times its mean dimension, then it is called elongated. Image Source:utest.com.tr Recent Post: Flakiness Test of an Aggregate Used IS Sieve :- 25 mm 20 mm 16 mm 12.5 mm 10 mm 6.3 mm Also Read: Civil engineering related important questions with their answers Teat Procedure :- Image Source:Indiamart.com (i) The aggregate of 200 pieces which is kept separately. (ii) Now, weight of 200 pieces and suppose weight=2187 gm. Then it will mention in the format. (iii) Elongation gauge will kept on a pan.Which aggregate will pass through this gauge, will fall fall in the bottom pan and whichever is not passes...

  Flakiness test is an important test of aggregate.Because, aggregate is important ingredient of concrete. Aggregate is how much flaky, it will acceptable or not, it is known by flakiness test.I am representing here flakiness test.   Flakiness Index - If aggregate least dimension is less than 3/5th or 0.6 of its mean dimensions, then it is called Flaky. Flakiness Gauge (Image Source:iricen.gov.in) Recent Post: Civil Engineering Related Important Questions With Their Answers Used IS Sieve :- 25 mm            20 mm 16 mm 12.5 mm 10 mm 6.3 mm Flakiness Gauge (Image Source:Amazon.in) Also Rest: Important terms on the basis of IS codes Test Procedure :- (i) To arrange all IS sieves in descending order as mentioned above. (ii) Take approx 7.5 kg. sample, weight of that sample and according to sieve size order, we will sieving them. (iii) Sieving as good method and on each sieve retaining 200 and 200 pieces of aggregate taken separately.(means 200 n...