Page 28EN 206-1:20005.3.3 Performan

Page 28
EN 206-1:2000
5.3.3 Performance-related design methods
The requirements related to exposure classes may be established by using performance-related design methods for
durability and may be specified in terms of performance-related parameters, e.g. scaling of concrete in a freeze/thaw
test. Guidance on the use of an alternative performance-related design method with respect to durability is given in
Annex J (informative). The application of an alternative method depends on the provisions valid in the place of use
of the concrete.
5.4 Requirements for fresh concrete
5.4.1 Consistence
Where the consistence of concrete is to be determined, it shall be measured either by means of:
– slump test conforming to EN 12350-2;
– Vebe test conforming to EN 12350-3;
– degree of compactability conforming to EN 12350-4;
– flow table test conforming to EN 12350-5;
– specific methods to be agreed upon between the specifier and the producer for concrete for special applications
(e.g. earth moist concrete).
NOTE Due to the lack of sensitivity of the test methods beyond certain values of consistence, it is recommended to use the
indicated tests for:
– slump
=
10 mm and
=
210 mm;
– Vebe time
=
30 sec and > 5 sec;
– degree of compactibility
=
1,04 and < 1,46;
– flow diameter > 340 mm and
=
620 mm.
Where the consistence of concrete is to be determined, it shall be tested at the time of use of the concrete or in the
case of ready-mixed concrete, at the time of delivery.
If concrete is delivered in a truck mixer or agitating equipment, the consistence may be measured using a spot
sample obtained from the initial discharge. The spot sample shall be taken after a discharge of approximately
0,3 m
in accordance with EN 12350-1.
3
The consistence may be specified either by reference to a consistence class according to 4.2.1 or, in special cases,
by a target value. For target values, the related tolerances are given in table 11.
Table 11 – Tolerances for target values of consistence
Slump
Target value in mm
=
40 50 to 90
=
100
Tolerance in mm ± 10 ± 20 ± 30
Vebe time
Target value in sec
=
11 10 to 6
=
5
Tolerance in sec ± 3 ± 2 ± 1
Degree of compactability
Target value
=
1,26 1,25 to 1,11
=
1,10
Tolerance ± 0,10 ± 0,08 ± 0,05
Flow diameter
Target value in mm all values
Tolerance in mm ± 30
5.4.2 Cement content and water/cement ratio
Where the cement, water, or addition content is to be determined, the cement content, addition content or added
water shall be taken either as recorded on the print-out of the batch recorder or where recording equipment is not

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Page 28EN 206-1:20005.3.3 Performance-related design methodsThe requirements related to exposure classes may be established by using performance-related design methods fordurability and may be specified in terms of performance-related parameters, e.g. scaling of concrete in a freeze/thawtest. Guidance on the use of an alternative performance-related design method with respect to durability is given inAnnex J (informative). The application of an alternative method depends on the provisions valid in the place of useof the concrete.5.4 Requirements for fresh concrete5.4.1 ConsistenceWhere the consistence of concrete is to be determined, it shall be measured either by means of:– slump test conforming to EN 12350-2;– Vebe test conforming to EN 12350-3;– degree of compactability conforming to EN 12350-4;– flow table test conforming to EN 12350-5;– specific methods to be agreed upon between the specifier and the producer for concrete for special applications(e.g. earth moist concrete).NOTE Due to the lack of sensitivity of the test methods beyond certain values of consistence, it is recommended to use theindicated tests for:– slump=10 mm and=210 mm;– Vebe time=30 sec and > 5 sec;– degree of compactibility=1,04 and < 1,46;– flow diameter > 340 mm and=620 mm.Where the consistence of concrete is to be determined, it shall be tested at the time of use of the concrete or in thetrường hợp của bê tông trộn sẵn, tại thời điểm giao hàng.Nếu bê tông được gửi trong một xe tải trộn hoặc agitating thiết bị, tánh cương quyết có thể được đo bằng cách sử dụng một chỗmẫu thu được từ việc xả ban đầu. Mẫu tại chỗ sẽ được thực hiện sau khi xuất viện của khoảng0,3 mtheo quy định EN 12350-1.3Tánh cương quyết có thể được xác định bởi tham chiếu đến một lớp học tánh cương quyết theo 4.2.1, hoặc trong trường hợp đặc biệt,một giá trị mục tiêu. Giá trị mục tiêu, dung sai liên quan được đưa ra trong bảng 11.Bảng 11-dung sai cho mục tiêu giá trị của tánh cương quyếtSụt giảmGiá trị mục tiêu trong mm=40 50-90=100Khoan dung trong mm ± 10 ± 20 ± 30Vebe thời gianGiá trị mục tiêu trong giây=11 10-6=5Khoan dung trong giây ± 3 ± 2 ± 1Mức độ compactabilityGiá trị mục tiêu=1,26 1,25 để 1,11=1,10Khoan dung ± 0,10 ± 0,08 ± 0,05Dòng chảy đường kínhNhắm mục tiêu các giá trị trong mm tất cả giá trịKhoan dung trong mm ± 305.4.2 tỷ lệ nội dung và nước/xi măng xi măngMà xi măng, nước hoặc nội dung bổ sung là để được xác định, nội dung xi măng, nội dung bổ sung hoặc bổ sungnước sẽ được thực hiện hoặc ghi lại in-out của lô ghi hoặc nơi thiết bị ghi âm là không