In order to improve the impact performance, the structure of hydraulic hammer should be optimized. In this paper, the ranges of eight vital structure parameters of piston and reversing valve system of hydraulic hammer were selected firstly; and then found the best value of different parameters under experiments with the method of computer optimization and the parametric analysis method provided...

In many rock engineering projects, accurate identification of rock strength properties is very important. Uniaxial compressive strength is one of the most important features to describe the resistive behavior of rocks which is used as an important parameter in the design of structures especially underground openings. Determination of this parameter using direct methods, including uniaxial compr...

Spatial variability of concrete is an important characteristic, which qualifies the non-homogeneity of concrete properties within structural components. Assessing it can be of great interest for damaged areas localization and for reliability analysis of structures. A two-stage experimental program was carried out using non-destructive testing (NDT) on laboratory concrete slabs in outdoor enviro...

In the construction industry, non–destructive testing (NDT) methods are often used in field to inspect compressive strength of concrete. NDT do not cause damage existing structure and relatively economical. Two popular rebound hammer (RH) test ultrasonic pulse velocity (UPV) test. One major drawback RH UPV is that concrete estimations very accurate when comparing them results obtained from dest...

The present study investigates the aggregate suitability and geochemical characteristics of limestone (LS) from Samana Suk Formation, Pakistan, for construction industry. With advent CPEC, demand materials has seen a manifold increase. Sheikh Budin Hills Trans Indus Ranges comprise huge deposits provide great potential source rocks in region. In Upper Basin Formation is acknowledged as most sig...

Uniaxial compressive and Brazilian tensile strengths (UCS and BTS) of rocks are considered important properties in the design of most the geotechnical projects that interact with rock such as slope stability and underground excavation. Measuring UCS and BTS using standard laboratory tests are time consuming, tedious and expensive. Moreover, it requires a large number of well-prepared rock cores...

Estimating variations in material properties over space and time is essential for the purposes of structural health monitoring (SHM), mandated inspection, insurance civil infrastructure. Properties such as compressive strength evolve are reflective overall condition aging Concrete structures pose an additional challenge due to inherent spatial variability large length scales. In recent years, n...