Ultrasonic measurements and static load tests in bridge evaluation

Hassan, Munzer; Burdet, Olivier; Favre, Renaud

doi:10.1016/0963-8695(95)00043-7

Cited by 15 publications

(7 citation statements)

References 6 publications

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“…Ultrasonic pulse velocity (UPV) testing is reported by several authors [5,6] as a useful and reliable non destructive tool of assessing the mechanical characteristics of concrete from existing structures, such as, the modulus of elasticity and the compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic evaluation of the physical and mechanical properties of granites

et al. 2008

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Masonry is the oldest building material that survived until today, being used all over the world and being present in the most impressive historical structures as an evidence of spirit of enterprise of ancient cultures. Conservation, rehabilitation and strengthening of the built heritage and protection of human lives are clear demands of modern societies. In this process, the use of nondestructive methods has become much common in the diagnosis of structural integrity of masonry elements. With respect to the evaluation of the stone condition, the ultrasonic pulse velocity is a simple and economical tool. Thus, the central issue of the present paper concerns the evaluation of the suitability of the ultrasonic pulse velocity method for describing the mechanical and physical properties of granites (range size between 0.1-4.0 mm and 0.3-16.5 mm) and for the assessment of its weathering state. The mechanical properties encompass the compressive and tensile strength and modulus of elasticity, and the physical properties include the density and porosity. For this purpose, measurements of the longitudinal ultrasonic pulse velocity with distinct natural frequency of the transducers were carried out on specimens with different size and shape. A discussion of the factors that induce variations on the ultrasonic velocity is also provided. Additionally, statistical correlations between ultrasonic pulse velocity and mechanical and physical properties of granites are presented and discussed. The major output of the work is the confirmation that ultrasonic pulse velocity can be effectively used as a simple and economical nondestructive method for a preliminary prediction of mechanical and physical properties, as well as a tool for the assessment of the weathering changes of granites that occur during the serviceable life. This is of much interest due to the usual difficulties in removing specimens for mechanical characterization.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic evaluation of the physical and mechanical properties of granites

et al. 2008

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“…where ρ is the density of hardened concrete (kg/m 3 ) and V is the ultrasonic pulse velocity (m/s). Cement composites do not fulfil the physical requirements for the validity of the above equation, nevertheless, numerous researchers [28][29][30] successfully utilised it for quality control and technical checks of concrete structures in service. The test is very handy for the detection of voids, deterioration processes of different origins, and general uniformity of the cast concrete [31].…”

Section: Resultsmentioning

confidence: 99%

Influence of Crimped Steel Fibre on Properties of Concrete Based on an Aggregate Mix of Waste and Natural Aggregates

2020

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This research was inspired by the growing global shortage of natural aggregates. Different types of waste ceramics (apart from recycled concrete) are the most popular materials for the production of waste aggregates as possible substitutes for natural ones. The aim of this research was to analyse the efficiency of different aggregate mixes composed of waste and natural materials focusing on two waste ceramic aggregates, which were prepared concrete mixes based on specifically composed aggregates (blend of natural aggregate, porous and iron oxide-rich (red) waste ceramic aggregate, and dense, kaolin-based (white) waste ceramic aggregate). All aggregates were thoroughly tested before utilisation for concrete mix creation. Altogether, four blends of aggregates were prepared in order to prepare concrete mixes using a simplex experiment design. The mixes were then modified by adding various amounts of crimped steel fibre. Such properties of hardened steel fibre-reinforced concrete (SFRC) such as density, compressive strength, shear strength, ultrasound propagation velocity, dynamic modulus of elasticity, and limit of proportionality during flexural testing were of special interest. Tests were conducted according to European and Japanese standards. The achieved fibre-reinforced concretes were characterised by satisfactory strength characteristics, thereby enabling the substitution of traditional reinforcement. Strength classes according to the fib Model Code 2010 were assigned.

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“…The objective of the first stage was to determine the compressive strength of the three groups of composites in question. Equations (1), (2) and (3) describe fitted functions. An apparatus with two transducers (one pulse generator and one receiver) was employed to generate an ultrasound pulse with a frequency of 54kHz.…”

Section: Research Programmementioning

confidence: 99%

Combined Non-Destructive Testing Approach to Waste Fine Aggregate Cement Composites

Katzer¹,

Kobaka²

2009

Science and Engineering of Composite Materials

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The research programme presented in this paper covers the estimation of fine aggregate cement composites strength by combined methods of non-destructive testing. Waste fine aggregate and CEM I 32.5 were used to prepare cement composites characterized by workability class VI and V2 (according to EN 206-1) and compressive strength ranging from 12 to 33MPa. There were composed eight mixes characterized by cement/water ratio ranging from 1.09 to 2.36. Specimens were tested in three saturation states: "dry", "moist" and "wet". Both commonly used rebound hammer and ultrasonic pulse velocity tests were conducted. Various charts showing the results are presented. The aim of the research programme was to deliver characteristic of rebound number versus ultrasonic pulse velocity, specific for the waste fine aggregate cement composite similar to such composites cast 30 years ago. It would enable to assess strength of waste fine aggregate cement composites used to erect structures in 1980's. This characteristic with 95% prediction intervals is presented at the end of the paper.

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Ultrasonic measurements and static load tests in bridge evaluation

Cited by 15 publications

References 6 publications

Ultrasonic evaluation of the physical and mechanical properties of granites

Ultrasonic evaluation of the physical and mechanical properties of granites

Influence of Crimped Steel Fibre on Properties of Concrete Based on an Aggregate Mix of Waste and Natural Aggregates

Combined Non-Destructive Testing Approach to Waste Fine Aggregate Cement Composites

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