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Investigation of expansive concrete structures through ...

2021-1-3  This paper investigates the strain behavior of normal concrete and expansive concrete used in three different newly constructed reinforced concrete structures, i.e., slabs, water tank walls, and pavements. Expansive additives with different chemical compositions were used for expansive concrete structures

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Investigation of expansive concrete structures through ...

Investigation of expansive concrete structures through strain monitoring in field structures. ... To extend the scope of investigations beyond the temperature profiles tested in the laboratory, a ...

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Investigation of Crack Control of Underground Concrete ...

Cracking of concrete structures during hydration often occurs during construction. This study investigated the expansive property of concrete with an unstrained expansive agent to reduce cracking. Laboratory tests, field measurement, and numerical simulations on deformation during hydration were investigated.

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Experimental Investigation of the Use of Expansive ...

2020-7-31  Hydration reactions of expansive materials are typically very safe, easy to induce, and low in cost, while the crushing of such materials is typically free from noise, dust, vibration, and toxic gases. In the present study, to realize the application of expansive materials in the prevention of coal seam gas disasters, the microstructure, heat release rate, and expansive pressure of expansive ...

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Micromechanics investigation of expansive reactions in ...

2005-10-10  Expansive reactions damage porous materials through the formation of reaction products of a volume in excess of the available space left by the reactants and the natural porosity of the material. This leads to pressurizing the pore space accessible to the reaction products, which differs when the chemical reaction is through-solution or ...

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Numerical investigation on expansive volume strain in ...

2012-11-1  The cement used in the specimen is commercial Portland II 42.5 type, the mineral compositions of which are presented in Table 1.The mix weight proportions of concrete materials are listed in Table 2, and the initial concentrations, c i, of Na +, K +, Ca 2+, SO 4 2-, OH-in the saturated pore solution are respectively 107.1, 116.5, 2.3, 1.9 and 224.4 (mol/m 3) .

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Investigation of Crack Control of Underground Concrete ...

Cracking of concrete structures during hydration often occurs during construction. This study investigated the expansive property of concrete with an unstrained expansive agent to reduce cracking.

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Micromechanics investigation of expansive - JSTOR

expectations of concrete structures. These chemical reactions operate at a scale much below the macrolevel of material description, i.e. the typical size of laboratory test specimen. The mechanism by which expansive reactions damage concrete is through the formation of reaction products of a

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Geotechnical structures: investigation of drilled shafts ...

2019-5-13  Geotechnical structures: investigation of drilled shafts in highly expansive soils Mohammed Faruqi Department of Civil and Architectural Engineering, MSC 194, Texas A and M University – Kingsville, TX 78363, USA Correspondence [email protected]

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RECOMMENDED PRACTICE FOR EXPENSIVE CONCRETE

2008-5-30  Expansive concrete, through its expansive effect, is capable of reducing cracks due to drying shrinkage and other causes, and since cracking strength can be improved, application to water tanks water purification plants, underground structures bridge deck slabs, tunne1 linings, structures such as

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(PDF) Micromechanics investigation of expansive reactions ...

The mechanism by which expansive reactions damage concrete is through the formation of reaction products of a volume in excess of the available space left by the reactants and the natural porosity of the material. One contribution of 7 to a Theme Issue ‘Thermodynamics in solids mechanics’.

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Experimental investigation on long term flexural ...

Composite Structures. Volume 163, 1 March 2017, Pages 101-113. Experimental investigation on long term flexural performance of expansive concrete beams eccentrically reinforced by CFRP. Author links open overlay panel Qi Cao a Haibo Jiang b Zhimin Wu ...

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Experimental investigation on long term flexural ...

2017-3-1  10% expansive agent was selected after the optimization process. The measured tensile strength for ordinary concrete (0%) and expansive concrete (10%) were 2.95 MPa and 2.77 MPa.And elastic modulus for ordinary concrete (0%) and expansive concrete (10%) were 35.7 MPa and 29.6 MPa respectively.. In this study, carbon fiber reinforced polymer (CFRP) sheets were prefabricated through

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RECOMMENDED PRACTICE FOR EXPENSIVE CONCRETE

2008-5-30  Expansive concrete, through its expansive effect, is capable of reducing cracks due to drying shrinkage and other causes, and since cracking strength can be improved, application to water tanks water purification plants, underground structures bridge deck slabs, tunne1 linings, structures such as

Get Price

Investigation on expansion effect of the expansive agents ...

At 60 days, the initial fracture toughness and unstable fracture toughness of expansive concrete with the compounding ratio of 2:1 reached the maximum values, which were 1.12 times and 1.09 times ...

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284-CEC : Controlled expansion of concrete by adding

Investigation of structures using concrete prepared with MgO-based expansive agents: successes, failures, causes; Preparation of a state-of-the-art report on properties of concrete prepared with MgO-based expansive agent and engineering application. 3 rd year:

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Concrete Structure - an overview ScienceDirect Topics

Concrete structures that are exposed to the atmosphere normally have an abundant supply of oxygen available, both to act as a cathodic reactant at the surface of embedded steel and to cause the transformation of the anodically formed Fe 2 + ions to rust. Cases of general oxygen depletion are therefore unlikely to occur except in circumstances where the material is fully immersed in water ...

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Experimental Investigation of the Use of Expansive ...

2020-7-31  Hydration reactions of expansive materials are typically very safe, easy to induce, and low in cost, while the crushing of such materials is typically free from noise, dust, vibration, and toxic gases. In the present study, to realize the application of expansive materials in the prevention of coal seam gas disasters, the microstructure, heat release rate, and expansive pressure of expansive ...

Get Price

Geotechnical structures: investigation of drilled shafts ...

2019-5-13  Geotechnical structures: investigation of drilled shafts in highly expansive soils Mohammed Faruqi Department of Civil and Architectural Engineering, MSC 194, Texas A and M University – Kingsville, TX 78363, USA Correspondence [email protected]

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Study of Expansive Soils and Residential Foundations on ...

In this study, an overview of the Phoenix Valley, Arizona, geotechnical practice and foundation performance related to residential structures on expansive clays, was developed through surveys and interviews with geotechnical engineers, structural engineers, and homebuilders.

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Micromechanics investigation of expansive reactions in ...

Expansive reactions damage porous materials through the formation of reaction products of a volume in excess of the available space left by the reactants and the natural porosity of the material. This leads to pressurizing the pore space accessible to the reaction products, which differs when the ch

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Surface Quality of Actual Structure with Concrete Using ...

The performances of the concrete structure with expansive additives are studied in this research. These expansive additives have helped in reducing the generation of cracks and have showed improved durability. This research evaluates the performance of actual structures through reviews of existing techniques with air permeability, surface water absorption, measurement of distortion of the ...

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Study of Expansive Soils and Residential Foundations on ...

In this study, an overview of the Phoenix Valley, Arizona, geotechnical practice and foundation performance related to residential structures on expansive clays, was developed through surveys and interviews with geotechnical engineers, structural engineers, and homebuilders.

Get Price

A Case Study on Expansive Soils and Rocks of Al-Khod in ...

2021-4-12  site investigation of the grollild was canicd out. The village consists of 92 houses of one and two stories as well as communal buildings such as a mosque, a hea1th clinic and a welfare shop. The wa1ls of the building . structures . are generally constructed with solid concrete blockwork whereas the floor and roof slabs are of

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Performance of Concrete with Mineral Expansive Agents

2021-4-17  of concrete. Minerals with expansive actions have been found to not only promote self-sealing but also the recovery of mechanical properties (self-healing), e.g., [14–19]. This paper reports on the interlaboratory tests on concrete with the addition of an expansive mineral blend based on magnesium oxide. A blend of three different powder minerals

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A Case Study on Rectification of Damaged Structures on ...

2021-4-12  structures serve not only as moisture barrier but also help in maintaining moisture equilibrium beneath the structure. This article presents the details of case study regarding rectification of damaged structures on expansive soil deposit at Anta (Rajasthan State, India). The problem faced at the gas

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Investigation of deformation of elements of three ...

2019-5-10  Investigation of deformation of elements of three-dimensional reinforced concrete structures located in the soil, interacting with each other through rubber gaskets Berezhnoi D., Balafendieva I., Sachenkov A., Sekaeva L. Kazan Federal University, 420008, Kremlevskaya 18, Kazan, Russia

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Effect of unsaturated expansive soils on canal linings: A ...

2017-2-27  pre-wetting, stabilization using lime or cement, and soil replacement. Since the water conveyance projects are linear nature so they may be passed long length through expansive soils. On the other hand, these structures have slopes in walls. So these treatment methods were either expensive or practically very difficult

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Adcor® 500S Thick-sectioned, conformable, hydro

2017-8-18  Thick-sectioned, conformable, hydro-expansive waterstop for preventing water entry through joints in concrete sub-structures PRODUCT DATA SHEET Product Description A conformable, swellable polymer/butyl rubber waterstop strip that expands in contact with water.

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Research Activities: Akira HOSODA ynuconcretelab

2020-1-29  Investigation of time-dependent development of flexural cracks of a long span RC box girder considering shrinkage property of concrete (Satoshi Komatsu, Akira Hosoda) International Symposium on Concrete and Structures for Next Generation (p.329-336) 2016/05

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