Construction and Building Materials articles from July 2001

Construction and Building Materials archives from July 2001

Preface.
July 1, 2001... The 2nd Kumamoto International Workshop on Fracture Mechanics and Acoustic Emission (KIFA-2) was held on 18 September, 2000 at Kumamoto City International Center in Kumamoto City, Japan. Following the 15th International Acoustic Emission...

Quantitative damage estimation of concrete by acoustic emission.
July 1, 2001... Abstract Damage estimation of structural concrete from concrete samples is developed, combining acoustic emission (AE) measurement with damage mechanics. The AE activity of a concrete sample during a uniaxial compression test is...

Acoustic emission at failure in quasi-brittle materials.
July 1, 2001... Abstract Development of failure in quasi-brittle materials is associated with microcracks, which release energy in the form of elastic waves called acoustic emission. From three types of tests -- diametral compression, flexure and...

Detection and evaluation of AE waves due to rock deformation.
July 1, 2001... Abstract In Japan, rock failure is one of the most frequent disasters as well as earthquakes. Because rock materials have brittle natures, deformation due to micro to macro fracture is normally of transient phenomenon. Acoustic emission...

Mixed mode crack propagation of homogenized cracks by the two-dimensional DDM analysis.(Statistical Data Included)
July 1, 2001... Abstract The crack propagation process in rock mass is numerically estimated by two-dimensional stress analysis. Rock mass typically contains numerous cracks within, with varying extent and orientation. In order to analyze the mechanical...

Visualization of failure in a pull-out test of cable bolts using X-ray CT.(Statistical Data Included)
July 1, 2001... Abstract The patterns of failure in a pull-out test are visualized by an X-ray CT scanner to supply the basic data on the bond failure of rock bolts and cable bolts. In the pull-out test, a comparison was made between two types of cable...

A separate method for evaluating the ultimate load-carrying capacity of aging and renovated sewage structures.(Statistical Data Included)
July 1, 2001... Abstract A separate method for evaluating the ultimate load-carrying capacity of aging and renovated sewage structures is proposed, which separately evaluates the contribution by reinforcement and plain concrete, and predicts the failure...

Acoustic emission monitoring of hydraulic fracturing in laboratory and field.(Statistical Data Included)
July 1, 2001... Abstract In the hydraulic fracturing tests, water was injected into four kinds of granitic rock specimens with different grain sizes. The fault plane solutions of acoustic emission (AE) indicated that the shear fracturing is dominant in...

Moment tensor evaluation of acoustic emission sources in salt rock.(Statistical Data Included)
July 1, 2001... Abstract Various moment tensor methods are applied to acoustic emission (AE) events which were recorded during a series of hydraulic fracturing tests in salt rock. The first two methods are absolute moment tensor methods using peak-to-peak...

Acoustic emission moment: tensor analysis: development for crack identification in concrete materials.(Statistical Data Included)
July 1, 2001... Abstract The moment tensor analysis of acoustic emission (AE) provides quantitative information on kinematics of cracks. Simple AE moment tensor analysis has been developed and named SiGMA-AE analysis. In-plane unconfined compression tests...