The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Scenario-based specification with the Scenario Modeling Language (SML) is an intuitive approach for formally specifying the behavior of reactive systems. SML is close to how humans conceive and communicate requirements, yet SML is executable and simulation and formal realizability checking can find specification flaws early. The realizability checking complexity is, however, exponential in the number...
We present a distributed fiber optic sensing scheme to study 3D temperature fields inside concrete containers submitted to fire. High spatial resolution (3cm to 13cm), temperature uncertainty better than 3°C and rapid measurements (in the minute range) were required. We thus compared advantages and drawbacks of three sensing chains, based on Rayleigh, Brillouin and Raman scatterings; such distributed...
The paper presents the test results for the use of the modified IADP (Identification of Active Destructive Processes) acoustic emission method to identify destructive processes that occur in unloaded early-age concrete. The results of the tests performed on 24 specimens made with limestone aggregate at varied conditions of curing and hardening and at the presence of reinforcement and additions, confirm...
In sewerage industry, hydrogen sulphide induced corrosion of reinforced concretes is a global problem. To achieve a comprehensive knowledge of the propagation of concrete corrosion, it is vital to monitor the critical factors such as moisture. In this context, this paper investigates the use of resistance measuring and processing for estimating the concrete moisture content. The behavior of concrete...
The paper describes advanced prediction methods used in modern branch of structural fire engineering. Application of methods based on mathematical modeling is shown in three studies of prediction of fire dynamics in railway tunnel, fire spread in experimental building and structural fire behaviour of timber-FRC floor. Introduced applications based on performance fire design show promising approach...
An extensive and varied usage of optical fibers is found widely in all the engineering sectors. This paper aims at providing a feasible solution for measuring the stress applied on the reinforced concrete slab using an optical fiber. An MSP430 board is used as the signal conditioning circuit to calibrate the sensed pressure and the same also employs a clever strategy to log the data in standalone...
In some of the tropical countries such as Malaysia, various conditions of temperature and rainfall throughout the year are severe when compared to European countries. Humidity and rainfall throughout the year are likely to affect the durability of material used in buildings. Very high level of rainfall causes significant issues in concrete flat roofs due membrane failure. This would potentially contribute...
The physical properties of three 60% alumina monolithic refractories with different types of binders were evaluated to determine optimum conditions of use and product selection for several applications within the cement pyroprocessing train.
This paper describes the implementation of a wireless sensor and actuator network (WSAN) designed to reduce costs and optimize the construction workflow in civil engineering. The WSAN focuses on monitoring the maturity of huge concrete structures. Maturity monitoring is a simple and nondestructive method for estimating the strength gain of concrete structures at early stages. This technique is based...
The article is devoted to the studies of boring process of the simulator of lunar soil to determine functional possibilities of developed model sample of drilling apparatus.
In this paper a new measurement method is developed to measure the length and width of the cracks in concrete construction. The new method is based on the optical measurement and image processing techniques. Firstly original images are preprocessed for calculation. Then calibration of pixel on the basis of the theory of correlation of digital speckle is to get the real size of one pixel. The length...
It is shown that the increasing defectness (cracking) of concrete under the influence of multiplyrepeated freezing-thawing cycles leads to a definite transformation of the spectral characteristics of the electric signal generated in the material in response to mechanical impact pulses. It is suggested that the maximum coefficient of mutual correlation between the spectrum of the electric response...
The article introduces the results of using the infrared radiometry method for qualitative evaluation of stress-strain state in different parts of the rock mass at Tashtagol mine.
We report on long-term measurement results on post-tensioned concrete specimens. A total number of 8 specimens, each of dimensions 700×150×150mm3 and four each of two different concrete mix designs, are subjected to prestress by post-tensioning iron bars conducted in a central longitudinal hole. During their drying phase the specimens undergo a prestress loss from creep and shrinkage, resulting in...
The development and test of a smart RFID-based corrosion sensor is presented. The sensor has a small size (5 cm × 3 cm × 1.8 cm) allowing it to be embedded in concrete or other construction materials. The corrosion sensor is built around a low-power microcontroller which enables multiple and complex measurements to take place. The sensor is totally passive and it does not require batteries. Its power...
An optical fiber sensor system that can be installed and used to give reliable and informative data has been developed, tested and evaluated for the past two years on a 50 year-old concrete foot bridge of known conditions. Besides environmental monitoring, the bridge has been subjected to different loading and specific damages have been induced. The evolution of the bridge has been recorded using...
Building construction technology industry has made great improvement, the scale of building is enlarging., large-scale structure of modern technical facilities also increase, mass concrete has become an important part of forming the large facility, the problem of cracking in mass concrete is technical problems with a certain universality, so how to take effective measures to prevent the large volume...
The Three Gorges Project (TGP) is the largest concrete construction in the present world. The project, with a total amount of approximately 28 million m3 of concrete, is characterized by complicated structures, intensive construction and high technical standards, which should meet the requirements not only of stability but also of special flood releasing, power generation and navigation improvement...
Accurate coefficient of permeability is of vital importance for the underground water computing. In the paper, the coefficient of permeability is identified based on the observed hydraulic heads and drainages. An optimization model is used to identify the coefficient of permeability, which is solved with genetic algorithm. The performances of the proposed identification measure with improved genetic...
This article discuss firstly the research and practice of temperature control technology of massive concrete in large-scale cushion cap in Baishazhou Yangtze bridge at Wuhan and Sutong bridge, then demonstrates that the using of screen optimization of raw materials and mix proportion, scientific planning of pouring technology, reasonable select of maintenance, and application of monitoring in real-time...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.