It was found that the tensile strengths of fiber reinforced concrete is about 14%, the peak strain about 39%,the fracture energy about 47% and maximum crack width about 28% higher than that of plain concrete when fiber volume fraction is 0. 1%.
This paper expounds the shrinkage effect and temperature effect of the concrete,and advances some measures for controlling the cracks of the concrete in the construction practice.
The test result indicates that a 6-storey compound structure with the sections of beams and columns being 250 mm×250 mm, the section of braces being 120 mm×120 mm and loading area being 4.2 m×4.2 m satisfies the code requests of cracks, deflection and load capacity in a way of vertical loads combination.
The relationship between medial crack length and normal loading was also investigated when specimens were indented by symmetrical wedges with interior angles of 30°-120°.
The forward problem is to solve the natural frequencies through a cracked structural model and the inverse problem is to quantitatively determine the crack parameters using the experimental testing frequencies.
To improve the machining precision of part surfaces and to facilitate tool design and cutting parameter selection, the initiation and propagation laws of glass cracks in specimens subjected to normal loading by symmetric wedges were investigated.
In addition, thermal cracking, thermal oxidization, carbonization and cyclization of organic substances on the surface of brake block can make the friction surface produce pores or cracks, thus fatigue wear occurs.
Continuous-flow reactor experiments were carried out to study coke formation from thermal cracking of home-made jet fuel RP-3 under supercritical conditions.
裂缝
crack 
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