Role of uncertainties in the lifetime performance of concrete structures

2007 ◽  
pp. 73-82 ◽  
Keyword(s):  
Concrete Structures ◽  
Lifetime Performance

scholarly journals The role of aggregate granulation on testing fracture properties of concrete

2021 ◽  
Vol 15 (58) ◽  
pp. 376-385
Author(s):  
Marta Słowik
Keyword(s):  
Fracture Process ◽  
Process Zone ◽  
Concrete Structures ◽  
Cement Matrix ◽  
Hardened Cement ◽  
Professional Literature ◽  
Fracture Properties ◽  
Material Fracture ◽  
Fracture Processes

Concrete is a porous material containing aggregate of different sizes, hardened cement matrix with air pores, microcracks and water. Concrete internal structure is different from that of other engineering materials. Furthermore concrete is described as quazi-brittle material. Fracture processes in it form in a way that does not fit within classical theories. Therefore, to describe failure of concrete structures nonlinear fracture mechanics is often applied with success. Basic concrete parameters, like compressive and tensile strength, and modulus of elasticity, are not enough to analyze fracture processes in concrete structures. Additional fracture properties should be tested, among them fracture energy, complete diagram of stress-deformation under axial tension and the width of fracture process zone. Recognizing and testing fracture parameters is of paramount importance when analysing fracture process in concrete structures. The correct data of material’s properties and the adequate fracture model applied in numerical simulations influence final results. In the paper the findings reported in the professional literature are summarized and obtained results of the own numerical simulation are reported in order to  give a deeper knowledge on the role of aggregate on fracture properties of concrete.

scholarly journals The role of the material fracture properties in the size-effect law of concrete structures

1996 ◽  
Vol 18 (1) ◽  
pp. 40-48
Author(s):  
V. Tran Tu
Keyword(s):  
Size Effect ◽  
Process Zone ◽  
Crack Opening ◽  
Concrete Structures ◽  
Fracture Propagation ◽  
Fracture Properties ◽  
Nominal Strength ◽  
Material Fracture ◽  
General Size

The size effect of the nominal stress at failure in concrete structures is dealt within general. An existence of a rather large fracture process zone in front of crack tip is proved to be the main reason leading to the size effect of the nominal strength. On the basis of the new general size-effect law and numerical results of fracture propagation, a particularly proposed size effect law for beams in bending is developed, in which the role of each material fracture characteristic, especially the shape of the stress - crack opening curve, is elaborated clearly.

Contribution of Physico-Chemical Diagnostic Methods to Assessment of Real Reinforced Concrete Structures

2012 ◽  
Vol 253-255 ◽  
pp. 583-586 ◽  
Author(s):  
Amos Dufka ◽  
Jiří Bydžovský
Keyword(s):  
Reinforced Concrete ◽  
Concrete Strength ◽  
Concrete Structures ◽  
Diagnostic Methods ◽  
Reinforced Concrete Structures ◽  
Chemical Parameters ◽  
Strength Parameters ◽  
Physico Chemical

When assessing a condition of reinforced concrete structures the expert companies mostly place emphasis mainly on determination of material physico-chemical parameters (such as concrete strength parameters, reinforcement placing etc.). These figures are, of course, very important for example for structural analysis of a structure, but for complex assessment of a condition are these data fully insufficient. This article illustrates the role of physico-chemical analysis when assessing a condition of reinforced concrete structures using a specific example.

Experience With Blast-Furnace Slag As an Aggregate in Reinforced Concrete

CORROSION ◽  
1961 ◽  
Vol 17 (4) ◽  
pp. 155t-156t ◽  
Author(s):  
C. P. LARRABEE ◽  
S. K. COBURN
Keyword(s):  
Blast Furnace ◽  
Reinforced Concrete ◽  
Service Life ◽  
Prestressed Concrete ◽  
Blast Furnace Slag ◽  
Concrete Structures ◽  
Free Service ◽  
Furnace Slag

Abstract The role of blast-furnace slag as an aggregate in reinforced concrete is considered both in the light of present-day experience and in past erroneous reports. It was found that such slag actually is substantially inert insofar as any deleterious action toward steel is concerned. Several prestressed-concrete structures containing slag aggregate, in use for more than three years, showed every evidence of giving potentially long and trouble-free service life. 4.2.3, 6.6.5

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