precasted concrete block (IS 15658)

summary of is 15658

1. Precast concrete blocks  (IS 15658)   Jai prakash Neeraj       

2.                        Spcification Paver block                                                   Aspect ratio < 4                                                       Aggregate                                                                   So3 < .5%                                                                                       Water absorption < 2%                                                                       Nominal maximum size = 12 mm                                 Pigment                                                                       Pigment quantity <9% by weight of cement concrete          Particles Should be finer than cement                                       Durability                                                                      Dimension and tolerance :- Table 2                                   thickness and wearing layer :- Table 2                              Compressive strength for individual paver block >    85% of specified strength  (table 3)

3. Grade designation of paver blocks

4.                       Precaution

5. Requirements

6.       Tests for concrete block

7.                         Aspect ratio   Aspect ratio = mean length/mean depth

8.                   Water absorption

9. Compressive strength

10.         Abration resistance      test is done on abration testing machine. It can be done on dry as well as wet surface. calculate the  density of wearing surface (PR).  Disc speed should be 30rpm. dv  is measure of abration resistance .

11.                Table :- 1

12. Table : - 2

13. Table : - 3

14.                              Table 4