Influence of mass concrete constituents on its properties

Batog, Maciej; Giergiczny, Z.

doi:10.1016/j.conbuildmat.2017.04.085

Cited by 54 publications

(31 citation statements)

References 3 publications

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“…With the rapid development of China s economy, the influx of a large number of people into the economically developed first-and second-tier cities has accelerated the local infrastructure construction, and the number and scale of high-rise buildings have been increasing [1]. Generally 1 PhD., School of Civil Engineering, Luoyang Institute of Science and Technology, Luoyang, Henan 471023, China, email: glliguo@yeah.net speaking, the minimum section size of mass concrete is not less than 80 cm [2]. At first, mass concrete was used as building materials in water conservancy projects, but later, with the maturity of related technologies, it was gradually applied to high-rise buildings.…”

Section: Introductionmentioning

confidence: 99%

Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

2019

Archives of Civil Engineering

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A lot of heat will generate in mass concrete after pouring to form temperature cracks, which will reduce structural stiffness. This paper briefly introduces the principle of solid heat conduction and the cause of temperature crack formation and then used COMSOL software to simulate and analyze the mass concrete. The results showed that the simulation model had enough reliability to analyze the temperature change; the internal and external temperature of concrete rose first and then decreased; the formation of temperature crack was related to the internal and external temperature difference; the internal and external temperature difference was inversely proportional to the heat conductivity coefficient of concrete and directly proportional to the pouring temperature. Then, according to the analysis results, two measures were put forward to prevent temperature cracks in mass concrete: selecting concrete materials with high thermal conductivity, i.e., selecting coarse aggregate and fine aggregate with larger heat conductivity coefficient and reducing concrete pouring temperature, i.e., selecting cement with lower hydration heat, paying attention to temperature reduction in the process of concrete stirring, and reducing the amount of cement.

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Section: Introductionmentioning

confidence: 99%

Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

2019

Archives of Civil Engineering

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“…, and AFm family, which generally consists of monosulfoaluminate (SO 4 -AFm), hydroxy-AFm (OH-AFm), and carbonate-AFm (CO 3 -AFm) in the Portland cement paste, reacts with chloride ions to form the bound chloride of the layer structure (Cl-AFm) [17,22,[24][25][26][27][28]. However, as C 3 A, which plays an important role in the binding of chloride, is not suitable for mass concrete due to its high heat of hydration and low sulfate resistance, the proportion of C 3 A is limited [1,2,29].…”

Section: Introductionmentioning

confidence: 99%

Chloride‐Binding Capacity of Portland Cement Paste Blended with Synthesized CA₂ (CaO·2Al₂O₃)

Lee

Kim

Chen

et al. 2018

Advances in Materials Science and Engineering

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A chloride-binding capacity is the major factor to mitigate the ingress of chloride into concrete. This paper presents the chloride-binding capacity of Portland cement paste containing synthesized CA2 (CaO·2Al2O3). The CA2 was synthesized in the high-temperature furnace and characterized by X-ray diffraction for inspecting the purity. The synthesized CA2 was substituted for Portland cement by 0%, 5%, and 10% by weight, and the NaCl solution was used as an internal chloride, which is assumed as a total chloride. The chloride-binding capacity of cement paste was calculated from a water-soluble chloride extraction method by the application of the Langmuir isotherm equation. And the hydration products were analyzed using X-ray diffraction and thermogravimetric analysis. We demonstrate that the CA2 increases an AFm phase in the Portland cement system, and the incorporation of CA2 consequently enhances the chloride-binding capacity of cement paste samples.

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“…Hence choosing a cement with low heat generation or the use of additions with latent hydraulic activity (type II according to [2]) are possibilities to reduce the hydration energy [13][14][15]. A cement with low hydration energy (CEM III/B) is chosen for the core concrete.…”

Section: Requirements For Low Hydration Energy Core Concretementioning

confidence: 99%

“…Only the zone near the surface requires a high durable concrete, which leads to high cement content and low w/c ratios. In mass concrete structures thermal stresses during hydration are a known problem [7][8][9][10][11][12][13][14][15][16]. These thermal stresses can lead to cracks in the concrete.…”

Section: Introductionmentioning

confidence: 99%

FE-Study on the Effect of Gradient Concrete on Early Constraint and Crack Risk

Strieder

Hilber²,

Stierschneider

et al. 2018

Applied Sciences

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Abstract:In long-lasting mass concrete structures the desired material properties of the concrete mix to realize a durable concrete and a concrete surface without cracks conflict with each other. The requirement of concrete with high durability leads to high thermal energy release and therefore, as another consequence, to high crack risk. Crack reduction is achieved by use of concrete with low hydration energy, which on the other hand leads to a decrease in concrete durability. Besides from optimized base materials and concrete technology, a gradient material distribution in the cross-section could reduce the problem since durable concrete is needed near the surface and the requirement of low-hydration energy is located in the center of the member. A simplified model is used to investigate the possible effect of a gradient concrete material distribution in mass concrete structures on crack reduction. The results of the analysis show that gradient concrete might contribute to lowering the constraint stresses and therefore the crack risk during concrete hardening.

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Influence of mass concrete constituents on its properties

Cited by 54 publications

References 3 publications

Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

Chloride‐Binding Capacity of Portland Cement Paste Blended with Synthesized CA₂ (CaO·2Al₂O₃)

FE-Study on the Effect of Gradient Concrete on Early Constraint and Crack Risk

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Influence of mass concrete constituents on its properties

Cited by 54 publications

References 3 publications

Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

Formation of Temperature Cracks of Concrete in High-Rise Buildings and the Corresponding Measures

Chloride‐Binding Capacity of Portland Cement Paste Blended with Synthesized CA2 (CaO·2Al2O3)

FE-Study on the Effect of Gradient Concrete on Early Constraint and Crack Risk

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Chloride‐Binding Capacity of Portland Cement Paste Blended with Synthesized CA₂ (CaO·2Al₂O₃)