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Some properties of higher strength light-weight concrete under short-term tensile stress
Abstract This paper describes two methods of checking the tensile strength of concrete, viz. by uniaxial tension and by axisymmetric compression through nitrogen-gas pressure applied to the bare concrete surface. Two lightweight aggregate concretes and a limestone aggregate concrete were tested over a range of cement contents and strengths. It is suggested that the nitrogen gas test could be used as a site test; excellent correlation was found between the two methods. The Bache/Nepper-Christensen model was successfully used to calculate the lightweight aggregate tensile strength in concrete. Typical tensile stress/strain relations are shown for the concretes and their mortar phase, together with ultrasonic pulse transit time and Poisson's ratio; it is thought that stable and unstable fracture propagation begin at about 65–70% and 95%, respectively, of the ultimate tensile stress. The tensile strain capacity of the light-weight concretes is significantly better than that of the limestone concrete, which, itself, has very good aggregate/matrix bond. The tensile strains and strain capacity of the concrete tested in the nitrogen gas test are less than half the values expected under uniaxial tension.
Some properties of higher strength light-weight concrete under short-term tensile stress
Abstract This paper describes two methods of checking the tensile strength of concrete, viz. by uniaxial tension and by axisymmetric compression through nitrogen-gas pressure applied to the bare concrete surface. Two lightweight aggregate concretes and a limestone aggregate concrete were tested over a range of cement contents and strengths. It is suggested that the nitrogen gas test could be used as a site test; excellent correlation was found between the two methods. The Bache/Nepper-Christensen model was successfully used to calculate the lightweight aggregate tensile strength in concrete. Typical tensile stress/strain relations are shown for the concretes and their mortar phase, together with ultrasonic pulse transit time and Poisson's ratio; it is thought that stable and unstable fracture propagation begin at about 65–70% and 95%, respectively, of the ultimate tensile stress. The tensile strain capacity of the light-weight concretes is significantly better than that of the limestone concrete, which, itself, has very good aggregate/matrix bond. The tensile strains and strain capacity of the concrete tested in the nitrogen gas test are less than half the values expected under uniaxial tension.
Some properties of higher strength light-weight concrete under short-term tensile stress
Lydon, F.D. (author) / Balendran, R.V. (author)
1980-01-01
15 pages
Article (Journal)
Electronic Resource
English
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