Page 153 - Water Standards
P. 153

if necessary. Before weighed by each shift, zero checking shall be
                       carried out for weighing equipment.
                           6  Allowable metric deviation of concrete ingredients shall meet
                       the requirements of Article 2   7   18 of this specification.
                           7  The concrete mixture shall be mixed homogeneously, and in⁃
                       spected according to SL 352  
                           8  The concrete slump shall be inspected 1⁃2 times per 4 hours.
                       The allowable deviation shall meet the requirements specified in
                       Table 3   3   10  

                                   Table 3   3   10  Allowable deviation of slump

                              Slump (cm)               Allowable deviation (cm)
                                 ≤4                            ±1
                                 4-10                          ±2
                                 >10                           ±3
                           9  Inspection of preparatory work before concrete pouring.
                             1) Foundation surfaces or concrete construction joint surfaces
                                shall be treated according to the requirements of SDJ 249.
                                Quality of forms, reinforcement bars and embedded parts
                                shall be inspected, and concrete pouring may not be
                                carried out until the pouring certificate is issued.
                              2 ) If  metal  structures, electromechanical  items  and
                                instruments are installed and buried, acceptance shall be
                                carried out according to the relevant standards or codes be⁃
                                fore issuing the pouring certificate.
                           10  During concrete pouring, specially⁃assigned persons shall
                       carry out the inspection and record in detail the construction process.
                           11  After the concrete form is stripped, appearance quality shall
                       be inspected. Quality problems or accidents of concrete cracking, ho⁃
                       neycomb, surface void, staggered step and form distortion, etc. shall
                         1 4 6
   148   149   150   151   152   153   154   155   156   157   158