1 General Provisions
1.0.1 This standard is formulated with a view to specifying and unifying the test method of performance on ordinary fresh concrete, enhancing the level of testing technique, ensuring the performance on fresh concrete, and meeting the quality requirement for precast concrete member and cast-in-place concrete work.
1.0.2 This standard is applicable to the test of performance on ordinary fresh concrete.
1.0.3 Test of performance on ordinary fresh concrete shall not only comply with the provisions of this standard, but also those specified in the relevant current ones of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1 ordinary concrete
concrete with dry apparent density of 2,000kg/m3~2,800kg/m3
2.1.2 slump
the slumped height of fresh concrete under the action of deadweight
2.1.3 slump-flow
the extended diameter of fresh concrete after slumping
2.1.4 passing ability
the performance of fresh concrete in uniformly passing through gap
2.1.5 J-Ring
annular instrument used for determining the passing ability of fresh concrete
2.1.6 self-compacting concrete
the concrete with high fluidity, uniformity and stability and capable of flowing and filling the space of formwork under the action of deadweight without tamping by external force during pouring
2.1.7 slump-flow time
the time required for fresh concrete to expand to the diameter of 500mm after slumping
2.1.8 bleeding
the phenomenon of fresh concrete in bleeding moisture content
2.1.9 pressure bleeding
the bleeding phenomenon of fresh concrete under pressure effect
2.1.10 consistency
index characterizing the flowability of fresh concrete, which can be represented by slump, Vebe consistency or slump-flow
2.1.11 segregation resistance
performance of all kinds of components in the fresh concrete for maintaining homogeneous dispersion
2.1.12 adiabatic temperature rise
temperature rise of concrete caused by hydration of cementing material under adiabatic condition
2.2 Symbols
2.2.1 Slump
Ho——the initial slump value of fresh concrete when it comes out from mixer;
H60——the slump value of fresh concrete after standing for 60min.
2.2.2 Slump-flow
L0——the initial slump-flow value of fresh concrete when it comes out from mixer;
L60——the slump-flow value of fresh concrete after standing for 60min.
目 录：
1 总则
2 术语和符号
3 基本规定
4 坍落度试验及坍落度经时损失试验
.....
GB/T 50080-2016 The following standards are cited：
