Bending strength FCF = FL/BHH
Where: f-ultimate load (n);
L- the distance between brackets, l = 450mm；;
B—— specimen width (mm);
H- sample height (mm).
Extended data:
Bending strength refers to the ultimate fracture stress of materials under the action of bending moment per unit area. Also known as flexural strength and modulus of rupture.
Ultimate stress of refractory clay or ceramic materials damaged by bending load. It is expressed by the ratio of the failure moment (n m) to the sectional resistance moment (cubic centimeter) at the fracture point, and the unit is Pa.
The experiment was carried out on a universal material testing machine. The sample is a cylinder with a height of (10 ~16) mm×120mm or a rectangular cylinder with a height of X 120mm× 120mm.
Only when the section occurs between two loading points can the bending strength be calculated, otherwise the result of the specimen is invalid.
influencing factor
Cement concrete pavement is directly affected by repeated vehicle loads and environmental factors (such as temperature and humidity), so it requires high flexural strength, durability, wear resistance and skid resistance of concrete slabs. Among them, flexural strength is an important control index of concrete pavement, and whether its size meets the design requirements will directly affect the overall quality and service life of pavement.
To meet the above requirements depends largely on the quality of raw materials, the composition of mixture and on-site construction control. Therefore, in order to meet the requirements of cement concrete pavement, the factors affecting its strength are analyzed, so as to select qualified materials, design scientifically and construct reasonably.
The following mainly from the quality of raw materials, concrete mix design and construction, combined with the actual brief analysis of the influencing factors of flexural strength of cement concrete.
Reference: Baidu Encyclopedia-Bending Strength