Expansive cement is a unique type of that, when mixed with water, produces paste which expands in volume significantly more than standard Portland cement. This expansion nullifies the deficit shrinkage that arises during concrete hardening. paper presents outcomes two phases experimentation. Phase I provides summary performance expansive mixes prepared various proportions cement, partially supp...

Presented are results of a research into the elaboration of the general method for numeric modelling of the stress-deformation state of reinforced concrete constructions during prolonged operating stresses and exposures. The method is presented in the form of an algorithm on the basis of which computer software has been developed for estimating reinforced concrete constructions operating in a d...

The monitoring of a precast, prestressed girder bridge during fabrication and service provided the opportunity to observe temperature variations and to evaluate the accuracy of calculated strains and cambers. The use of high curing temperatures during fabrication affects the level of prestress because the strand length is fixed during the heating, the coefficients of thermal expansion of steel ...

Concrete is the most ubiquitous construction material. Apart from the fresh and early age properties of concrete material, its condition during the structure life span affects the overall structural performance. Therefore, development of techniques such as non-destructive testing which enable the investigation of the material condition, are in great demand. Tomography technique has become an in...

Ballast is a porous layer that reduces the effective contact surface between sleeper and ballast. Also, does not have smooth bottom surface, which causes reduction of ballast particles. At field experiments, by installing sensitive papers under sleepers track, cyclic load was imposed passing trains, after certain amount loads, pressure paper removed, measured while in laboratory investigation, ...

The objective of this study was to describe sleep patterns in patients with heart failure (HF) and analyze associations between sleep and the following variables: gender, age, fatigue, fatigue on exertion, physical activity, functional class, drug therapy, dyspnea, and body mass index. The nonprobability sample consisted of 400 patients (mean age 57.8 years; 64.8% were men, average schooling of...

Based on the capability of controlling low-frequency elastic waves in solids with subwavelength size, locally resonant phononic crystals have potential applications track vibration reduction. By periodically embedding 3D unit cells (LRUCs) a concrete matrix, wave-resistance sleeper negative effective mass density is proposed, and generation mechanism bandgap parameter sensitivity are studied. F...