The Curing of Concrete Samples with Water - Experimental Verification of the Concrete Properties

2020 ◽  
Vol 868 ◽  
pp. 65-69
Author(s):  
Marek Ďubek ◽  
Marián Bederka ◽  
Peter Makýš
Keyword(s):  
Reinforced Concrete ◽  
Necessary Conditions ◽  
Concrete Slab ◽  
Strength Properties ◽  
Climatic Conditions ◽  
Reinforced Concrete Slab ◽  
Common Procedure ◽  
Concrete Properties ◽  
Concrete Ceiling

The process of producing a monolithic concrete structure on site is constructed out under different climatic conditions, which can often be unsuitable for setting and hardening of concrete. The necessary conditions for setting and hardening of concrete are ensured by various ways of its curing. In practice, concrete curing is carried out in most cases by water spraying. It is used mostly in reinforced concrete ceiling slabs, which are further discussed in the work. A common procedure is to cure the upper surface of reinforced concrete ceiling slabs. This work therefore deals with the effect of curing of a reinforced concrete slab, on its strength properties. Long-term curing would yield higher values of compressive strength, but it is also necessary to consider how effective it is. As a pilot research in this work is investigating the properties of concrete cubes in various curing. It further develops theoretical possibilities for continuing research.

An Assessment of the Long-Term Durability of Concrete in Radioactive Waste Repositories

1985 ◽  
Vol 50 ◽  
Author(s):  
A. Atkinson ◽  
D. J. Goult ◽  
J. A. Hearne
Keyword(s):  
Reinforced Concrete ◽  
Radioactive Waste ◽  
Concrete Slab ◽  
Laboratory Studies ◽  
Preliminary Assessment ◽  
Reinforced Concrete Slab ◽  
Radioactive Waste Repositories ◽  
Waste Repositories ◽  
Durability Of Concrete

AbstractA preliminary assessment of the long-term durability of concrete in a repository sited in clay is presented. The assessment is based on recorded experience of concrete structures and both field and laboratory studies. It is also supported by results of the examination of a concrete sample which had been buried in clay for 43 years.The enoineering lifetime of a 1 m thick reinforced concrete slab, with one face in contact with clay, and the way in which pH in the repository as a whole is likely to vary with time have both been estimated from available data. The estimates indicate that engineering lifetimes of about 103 years are expected (providing that sulphate resisting cement is used) and that pH is likely to remain above 10.5 for about 106 years.

scholarly journals Long-term study of the impact of temperature changes, material aging and service load on the strains of a reinforced concrete structure

2018 ◽  
Vol 66 ◽  
pp. 02006
Author(s):  
Adam Kanciruk
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Reinforced Concrete Structure ◽  
Reinforced Concrete Slab ◽  
Temperature Changes ◽  
Long Term Study ◽  
Monitoring Process ◽  
Service Load ◽  
The Impact

The article discusses five year long measurements of strains of a concrete floor of a hangar. That hangar, originally meant for servicing light military aircraft, was rebuilt with a view to making it fit for servicing larger and heavier passenger planes. As part of that redevelopment, a new floor - reinforced concrete slab, capable of withstanding the weight of the planes - was constructed. In the areas of the floor where the greatest loads occur, ie. in the areas of the concrete slab on which the wheels of the three undercarriage legs rest, three strain rosettes were installed so that the slab strains could be measured. The rosettes were connected to two meters - dataloggers. The latter were programmed in such a way as to register the measured strains and additionally temperatures many times during every 24 hours. The monitoring process, conducted in such an automatic way, demonstrated the occurrence of strains resulting from service load, aging of the reinforced concrete, as well as changes in its temperature.

Measuring the Deflection of Reinforced Concrete Slab

2015 ◽  
Vol 1106 ◽  
pp. 87-89
Author(s):  
Branislav Páleník ◽  
Anna Stará ◽  
Richard Kratochvíl ◽  
Miloš Zich
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Limit State ◽  
Concrete Slabs ◽  
Limiting Factor ◽  
Reinforced Concrete Slab ◽  
Precise Levelling ◽  
Reinforced Concrete Slabs ◽  
Concrete Ceiling

A significant limiting factor for the design of reinforced concrete ceiling slabs is the assessment of the limit state of deflections limit. There could be more methods of calculating deflections, but it is necessary to confront them with the reality on the construction. In this article the measurements of the deflection of reinforced concrete slabs are stated, which are then assumed to be compared with different calculation ways. For the measurement the slab was selected, which is located in a multifunctional building in Brno in Houbalova Street. The measurement was carried out by a precise levelling method.

scholarly journals Analysis of the effectiveness of thermal insulation of a multi-layer reinforced concrete slab using layer of concrete with low thermal conductivity under the climatic conditions of Vietnam

2018 ◽  
Vol 251 ◽  
pp. 04026 ◽  
Author(s):  
Vu Dinh Tho ◽  
Elena Korol ◽  
Nguyen Huy Hoang
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Reinforced Concrete ◽  
Thermal Insulation ◽  
Concrete Slab ◽  
Climatic Conditions ◽  
Concrete Slabs ◽  
Reinforced Concrete Slab ◽  
Low Thermal Conductivity ◽  
Reinforced Concrete Slabs

Multi-layer reinforced concrete slabs with thermal insulation materials are widely used in practice all over the world. In Vietnam, in order to apply modern construction of multi-layer structures with an inner layer of low thermal conductivity concrete into practice, it is necessary to conduct numerical researches on the peculiarities of the country climatic conditions country. In this paper, the authors analyze the heat transfer in multilayer reinforced concrete slabs’ roof under the climatic conditions of Hanoi (Vietnam) using finite element method with computer simulation. The object of the study is the insulating capacity of multilayer reinforced concrete roofs under the influence of changes in the temperature of the outer surface of the structure of the buildings’ roof. The research methods are based on the numerical simulation of heat transfer from the outer to the inner surface of the building roof. From the results obtained, compared to the traditional design solution, multilayer reinforced concrete slab appears to have more advantages, and these advantages are available with the use of heat-insulating material made of polystyrene concrete. These scientific researches enable to choose the rational roof design in Vietnam, which satisfies the demand to reduce influence of temperature.

Approach to the Load Resistance in Two Kinds of Bamboo Reinforced Concrete Slab

2011 ◽  
Vol 261-263 ◽  
pp. 459-463
Author(s):  
Camilo Flores Bastidas ◽  
Constanza Lucia Flores Bastidas ◽  
Jun Ichiro Giorgos Tsutsumi ◽  
Caori Patricia Takeuchi
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Load Resistance ◽  
Strength Properties ◽  
Load Test ◽  
Reinforced Concrete Slab ◽  
Steel Reinforced Concrete ◽  
Composite Slabs ◽  
Material Load ◽  
Bamboo Stem

Steel reinforced concrete is generally used in houses structure elements. However bamboo strength properties similarly to the wood, make it an alternative concrete composite material. Load test were performed in two kinds of bamboo guadua concrete reinforced composite slabs. During the tests the slabs functioned as domestic roofing-flooring in standing houses, the slab systems tested were bamboo stem covered slab and stem free slab. Two different tests were designed to measure the deflection in the middle of the composite slab and along a single bamboo stem. In three different slab sizes and after replications, no deflection under the applied load was recorded. Therefore, bamboo composite slabs without steel reinforcing seem likely to be used in long lasting houses for middle and high class dwellings in Colombia.

Dimension and Frequency Profiles of Concrete Highway Bridges in New Madrid Region of Southeastern Missouri

1997 ◽  
Vol 1594 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Ralph Alan Dusseau
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Highway Bridges ◽  
Ambient Vibration ◽  
Earthquake Hazards ◽  
Empirical Formulas ◽  
Reinforced Concrete Slab ◽  
Box Girder ◽  
Bridge Spans ◽  
New Madrid

The results of a study funded by the U.S. Geological Survey as part of the National Earthquake Hazards Reduction Program are presented. The first objective of this study was the development of a database for all 211 highway bridges along I-55 in the New Madrid region of southeastern Missouri. Profiles for five key dimension parameters (which are stored in the database) were developed, and the results for concrete highway bridges are presented. The second objective was to perform field ambient vibration analyses on 25 typical highway bridge spans along the I-55 corridor to determine the fundamental vertical and lateral frequencies of the bridge spans measured. These 25 spans included six reinforced concrete slab spans and two reinforced concrete box-girder spans. The third objective was to use these bridge frequency results in conjunction with the dimension parameters stored in the database to develop empirical formulas for estimating bridge fundamental natural frequencies. These formulas were applied to all 211 Interstate highway bridges in southeastern Missouri. Profiles for both fundamental vertical and lateral frequencies were then developed, and the results for concrete highway bridges are presented.

Sign in / Sign up

Export Citation Format

Share Document