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
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