Reference:
- Drawings of the project contract, Episode 16.4: CW3A (13 + 16 + 450.00 ~ 100.00), drawing Chui Rao Bridge Tunnel, Floodwalls and Pedestrian Bridge Crossing, The Tunnel Rao, The Drawings Chung, General Provisions, Section, Paragraph 3 - Concrete, Clause 3.1 - Table Level for Structural Concrete kinds;
- Technical Standards Project, Part 6 - Concrete and Structural Concrete, Category 06 100 - Concrete and Concrete Structures, Article 3.1.1 - The concrete level, Table 3 - Composition and strength of concrete for use in structures;
- Technical Standards Project, Part 1 - Regulation Generally, Section 01000 - Terms and general information, Article 2 - The design criteria, construction standards and acceptance Bored piles TCXDVN 326: 2004 shall apply (Standards to be converted from, and replaced How to TCXDVN 326: 2004 is the standard TCVN 9395: 2012, Section 10 - Concrete);
The contract drawings, which specify, Class D concrete compressive strength 30MPa used for bored piles, while at position Table 3, Paragraph 3.1.1 [Level concrete] the technical standards of the project also pointed to concrete grade D, amplitude loss superplasticizer has a minimum of 11cm and a maximum of 17cm.
However, in standard TCXDVN 326: 2004 (ISO 9395: 2012) - Bored piles - construction and acceptance criteria specified record, mix concrete with a slump from 18cm to 20cm.
Thus, The objective of the slump to place concrete piles required in Technical Standards Project, is from 11cm to 17cm from 18cm to 20cm different from that set forth in TCXDVN Standard 326: 2004 (ISO 9395 : 2012) is referenced standards of the project.
To ensure the specification of bored piling, respectfully request supervision consultant CDM Smith gives instructions on indicators of mixed concrete slump Concrete is applied to items Bored piles, as the basis for contractor work next deployment.
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