Experimental Measurements and Computer Analysis of Heat of Hydration and Shrinkage of Large-Scale Model of Reinforced Concrete Slab

2014 ◽  
Vol 1004-1005 ◽  
pp. 1594-1597
Author(s):  
Petr Tej ◽  
Jindřich Čech ◽  
Jiří Kolísko ◽  
David Čítek ◽  
Jan L. Vítek
Keyword(s):  
Reinforced Concrete ◽  
Computer Analysis ◽  
Large Scale ◽  
Concrete Slab ◽  
Heat Of Hydration ◽  
Scale Model ◽  
Experimental Measurements ◽  
Reinforced Concrete Slab ◽  
Large Scale Model ◽  
Concrete Body

This paper deals with the experimental measurements and computer analysis of the development of heat of hydratation and shrinkage in a large-scale model of a reinforced concrete slab. A large-scale model was built in situ to experimentally verify the design of the reinforcement, with the aim of preventing the formation of cracks in slab. The model represents a four times four meters cut of a slab structure of a thickness of 1.6 m. Bars in the horizontal direction of the slab were extended behind the concrete body and welded to a steel frame, which simulated the anchorage of horizontal reinforcement of a continuous slab. Before casting, the reinforcement bars were fitted with vibrating wire strain gauges and with resistance gauges for monitoring the strain, as well as with temperature sensors for determining the temperature field caused by heat of hydration. According to the needs of the experiment, the structure was modelled in GiD 11.0 software and calculated in the AtenaWin program. The experimental results and the results obtained by a numerical analysis were compared.

Experimental Measurements and Computer Analysis of Heat of Hydration and Shrinkage of Large-Scale Model of Reinforced Concrete Wall with Base

2014 ◽  
Vol 1004-1005 ◽  
pp. 1598-1601 ◽  
Author(s):  
Petr Tej ◽  
Jindřich Čech ◽  
Jiří Kolísko ◽  
David Čítek ◽  
Jan L. Vítek
Keyword(s):  
Reinforced Concrete ◽  
Computer Analysis ◽  
Large Scale ◽  
Heat Of Hydration ◽  
Scale Model ◽  
Experimental Measurements ◽  
Concrete Wall ◽  
Large Scale Model ◽  
Concrete Body ◽  
Reinforced Concrete Wall

This paper deals with the experimental measurements and computer analysis of the development of heat of hydration and shrinkage in a large-scale model of a reinforced concrete wall with a base slab. A large-scale model was built in situ to experimentally verify the design of the reinforcement, with the aim of preventing the formation of cracks in a long massive wall located on a base slab. The model represents a four meter cut of a long wall structure (thickness of 1.6 m) together with its base slab (thickness of 1 m). Bars in the longitudinal direction of the wall and of the base slab were extended behind the concrete body and welded to a steel frame, which simulated an anchorage of longitudinal reinforcement of a continuous wall with a base slab. Before casting, the reinforcement bars were equipped with vibrating wire strain gauges and resistance gauges for monitoring the strain, as well as with temperature sensors for determining the temperature field caused by heat of hydration. According to the needs of the experiment, the structure was modelled in GiD 11.0 software and calculated in the AtenaWin program. The results of the experiment and the numerical analysis were mutually compared.

Large-Scale Model Testing of a Concrete Silo EBS for Low- and Intermediate-Level Waste Disposal

1997 ◽  
Vol 506 ◽  
Author(s):  
K. Konishi ◽  
K. Ukaji ◽  
A. Fujiwara ◽  
T. Endo ◽  
Y. Tsuji
Keyword(s):  
Thermal Stress ◽  
Radioactive Waste ◽  
Waste Disposal ◽  
Large Scale ◽  
Heat Of Hydration ◽  
Intermediate Level ◽  
Scale Model ◽  
Large Scale Model ◽  
One Year ◽  
Intermediate Level Radioactive Waste

ABSTRACTThis study focuses on demonstrating the feasibility of constructing a large reinforced concrete silo for the disposal of low- and intermediate-level radioactive waste. In a large-scale model test, the results of temperature (from heat of hydration) and thermal stress analyses were confirmed, as was the practicality of countermeasures to prevent thermal cracking. After one year, the average permeability of the model silo was estimated to be below 1×10−11m/s.

scholarly journals Reinforced concrete slabs subjected to thermal loads

1993 ◽  
Vol 20 (5) ◽  
pp. 741-753 ◽  
Author(s):  
F. J. Vecchio ◽  
N. Agostino ◽  
B. Angelakos
Keyword(s):  
Reinforced Concrete ◽  
Large Scale ◽  
Ultimate Load ◽  
Mechanical Load ◽  
Concrete Slab ◽  
Shear Behaviour ◽  
Concrete Slabs ◽  
Reinforced Concrete Slab ◽  
Reinforced Concrete Slabs ◽  
Load Conditions

Eight large-scale reinforced concrete slab specimens were tested under combined thermal and mechanical load conditions. The specimens varied in the amount and orientation of the in-plane reinforcement provided. A three-phase loading regime was used to investigate thermal gradient effects at service and ultimate load conditions. The slabs experienced significant levels of stressing and cracking as a result of restrained thermal deformations. However, reductions in stiffness due to cracking and thermal creep caused rapid decays in the restraint forces developed. At ultimate load conditions, thermal load effects were minimal. Nonlinear finite element analysis procedures were used to investigate the theoretical response of the test slabs. Fairly accurate simulations of the specimens' behaviour were obtained. Important to achieving accurate results were the consideration of tension stiffening effects and out-of-plane shear behaviour. Key words: analysis, cracking, finite elements, plates, reinforced concrete, slabs, temperature, tests, thermal gradients.

Assessment of Fiber Reinforced Concrete Slab and Subsoil Interaction - Experiment

2018 ◽  
Vol 761 ◽  
pp. 169-172 ◽  
Author(s):  
Hynek Lahuta ◽  
Eva Hrubesova ◽  
Marek Mohyla ◽  
Lukáš Duris ◽  
Miroslav Pinka
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Hydraulic Press ◽  
Fiber Reinforced Concrete ◽  
Strain Gauges ◽  
Experimental Measurements ◽  
Reinforced Concrete Slab ◽  
Experimental Stand ◽  
Interaction Experiment ◽  
Degree Of Reinforcement

The paper is focused on the interaction of the fibre reinforced concrete slab and the subsoil using both the results of experimental measurements on the experimental stand. Performed experimental measurements include monitoring of the concentrically loaded concrete slab with the dimensions of 2 m x 2 m and thickness of 0.15 m. This slab is in the interaction with subsoil of sandy clay character. The experimental load is applied in sequential steps by using a hydraulic press. During the tests the strain gauges and hydrostatic levelling method were used for the monitoring of the settlements of the slab. The contact stresses and the stresses corresponding to a certain depth below the slab were monitored by using a flat pressure cells. In the conclusion of this paper there are formulated the basic aspects of concrete slab-subsoil interaction, the results of various performed experimental measurements and the comparison of stress below the surface resulted from interaction of soil and slab of different degree of reinforcement.

Finite element studies of reinforced concrete slab - edge column connections with openings

2007 ◽  
Vol 34 (8) ◽  
pp. 952-965 ◽  
Author(s):  
Hong Guan ◽  
Maria Anna Polak
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Large Scale ◽  
Numerical Study ◽  
Concrete Slab ◽  
Reinforced Concrete Slab ◽  
Element Analysis ◽  
Numerical Studies ◽  
Experimental Findings ◽  
Good Agreement

An extended nonlinear layered finite element method (LFEM) is used to investigate the influence of openings and shear stud reinforcement (SSR) on the behaviour of reinforced concrete slab – edge column connections. In all, ten large-scale slab – edge column connections tested previously are analyzed. The laboratory test variables were the size and location of the openings in the vicinity of an edge column and the existence of SSR. The numerical results of the load–deflection response, the ultimate strength, and the crack patterns are compared with the experimental findings and good agreement is achieved. A numerical study on two connections is also carried out to determine the influence of the locations of opening in slab – edge column connections with SSR. Discussion on code provisions for slabs with openings is provided. The comparative and numerical studies confirm the accuracy, reliability, and effectiveness of the LFEM in the analysis of slab – edge column connections with both openings and SSR.Key words:slab–column connection, punching shear, opening, shear stud reinforcement, finite element analysis.

Reinforced concrete slab-column edge connections with shear studs

2000 ◽  
Vol 27 (2) ◽  
pp. 338-348 ◽  
Author(s):  
Ehab F El-Salakawy ◽  
Maria Anna Polak ◽  
Monir H Soliman
Keyword(s):  
Reinforced Concrete ◽  
Large Scale ◽  
Concrete Slab ◽  
Punching Shear ◽  
Test Results ◽  
Shear Reinforcement ◽  
Reinforced Concrete Slab ◽  
Test Parameters ◽  
Flexural Reinforcement ◽  
Large Scale Tests

The paper reports the results of an experimental investigation on the influence of shear studs on the behaviour of reinforced concrete slab-column edge connections with openings. The test parameters were the location of openings around the column, the size of openings, and the existence of shear reinforcement. The objective of the paper is to present and discuss the results of large-scale tests on slabs with shear stud reinforcement and compare these test results with those of tests on identical slabs but without shear reinforcement. All tested slabs contained same amounts of typical flexural reinforcement (ACI 318-95 and CSA A23.3-94). The presented test results can be used for studying the behaviour of slab-column connections and for calibration of the predictive models.Key words: reinforced concrete, edge connections, flat concrete plates, punching shear, shear strength, openings, failure, shear studs, shear reinforcement.

RANCANG BANGUN PERANGKAT EKSPERIMENTASI PROSES PIROLISIS BIOMASA GELOMBANG MIKRO

2013 ◽  
Vol 14 (2) ◽  
Author(s):  
Noor Fachrizal
Keyword(s):  
Large Scale ◽  
Continuous Model ◽  
Biomass Energy ◽  
Scale Model ◽  
Small Scale ◽  
Laboratory Apparatus ◽  
Liquid Form ◽  
Large Scale Model ◽  
Bio Oil ◽  
Pyrolysis Of Biomass

Biomass such as agriculture waste and urban waste are enormous potency as energy resources instead of enviromental problem. organic waste can be converted into energy in the form of liquid fuel, solid, and syngas by using of pyrolysis technique. Pyrolysis process can yield higher liquid form when the process can be drifted into fast and flash response. It can be solved by using microwave heating method. This research is started from developing an experimentation laboratory apparatus of microwave-assisted pyrolysis of biomass energy conversion system, and conducting preliminary experiments for gaining the proof that this method can be established for driving the process properly and safely. Modifying commercial oven into laboratory apparatus has been done, it works safely, and initial experiments have been carried out, process yields bio-oil and charcoal shortly, several parameters are achieved. Some further experiments are still needed for more detail parameters. Theresults may be used to design small-scale continuous model of productionsystem, which then can be developed into large-scale model that applicable for comercial use.

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