A New Model for Optimal Mechanical and Thermal Performance of Cement-Based Partition Wall

Huang, Shiping; Hu, Mengyu; Huang, Yonghui; Cui, Nannan; Wang, Weifeng

doi:10.3390/ma11040615

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…For temperature analysis, the initial condition is T(x, y, z, 0) � T cast , in which T cast is the casting temperature. As illustrated in [34,35], the boundary conditions are chosen as follows:…”

Section: Initial and Boundarymentioning

confidence: 99%

Early‐Age Cracking Analysis of a HVFA Concrete Structure Based on Thermo‐Hygro‐Mechanical Modeling Combined with XFEM

Cui

Luo

Peng

2020

Advances in Materials Science and Engineering

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Due to the low hydration rate of high-volume fly ash (HVFA) concrete at early age, the temperature gradient between the concrete core and surfaces could be effectively reduced. However, the low hydration rate results in a lack of hydration degree for early-age HVFA concrete. Thus, during curing, compared to the strength of ordinary Portland cement (OPC), a subsequent lower one of HVFA concrete leads to a more sensitive response to inner stresses induced by thermal and moisture loads. Based on ABAQUS, in this paper, user subroutines in the temperature and moisture fields were developed, with regard to the hydration degree, for simulation of the temperature and moisture influences on concrete. Additionally, the Double Power Law (DPL) model was used to depict early-age deformations of concrete in the mechanical field. Combined with the extended finite element method (XFEM), another subroutine for early-age cracking analysis in the mechanical field was then developed. Together with aforementioned subroutines, a thermo-hygro-mechanical model is derived. For evaluation of early-age cracking initiation and propagation of a pier composed of HVFA concrete, the model was implemented with XFEM. The obtained results show that (1) temperature and restraints are the main causes of cracking; (2) moisture loss affects surface cracks on structures at early age; and (3) although the temperature difference between the core and surfaces is not much obvious due to the reduced rate of heat dissipation from hydration, cracking of early-age HVFA concrete is still likely to happen for its low early strength. Thus, timely curing is critical to prevent early cracking.

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Section: Initial and Boundarymentioning

confidence: 99%

Early‐Age Cracking Analysis of a HVFA Concrete Structure Based on Thermo‐Hygro‐Mechanical Modeling Combined with XFEM

Cui

Luo

Peng

2020

Advances in Materials Science and Engineering

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“…Various new types of prefabricated building materials have emerged one after another. In prefabricated buildings, the thermal energy consumption of the wall occupies 20% -50% of the total, and becomes the external maintenance structure with the most heat loss [2]. At present, there are many wall materials for prefabricated buildings, including prefabricated insulation board walls and multicavity composite walls etc., which vary in the heat and moisture transfer, engineering cost and energy-saving performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis for Thermal Performance and Energy-Efficient Technology of Prefabricated Building Walls

Zou¹,

Sun²

2020

IJHT

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At present, prefabricated buildings have been widely used in residential buildings and industrial plants. The energy-efficient design of their walls has increasingly become the focus of design in the construction industry. Taking the commonly used composite walls of prefabricated buildings in Inner Mongolia as the research object, the authors aim to explore the thermal performance of prefabricated building wall under cold conditions, and study the energy-efficient technology by determining the optimal thickness of the insulation layer. The study found that the external envelope structure such as the walls is the main heat dissipation method of the prefabricated building; as the thickness of the insulation layer increases, the thermal conductivity of the wall decreases, and the thermal inertia index increases, showing better insulation characteristics; the heat flux density of the composite wall designed with the external insulation layer was the smallest; the average daily heating power consumption of the composite wall with the polystyrene plastic interlayer was the minimum, and it reduced by 21.65% compared with the no-intermediary insulation layer. The research findings provide guidance and suggestions for the composite wall design and material selection of prefabricated buildings in Inner Mongolia.

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“…Alteration of the mechanical properties of hydrated Portland cement is expected at high-temperature conditions, since the elevated temperature adversely effects on the cement hydrated products [6,8,9,10,11,12,13,14,15]. The conditions of elevated temperature are expected in deep wells, geothermal wells, and wells subjected to steam injection for enhanced oil recovery (EOR) applications, since the injected steam is able to decrease the oil viscosity, and hence, increase its mobility and finally enhance the oil production [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Nanoclay Content on Cement Matrix for Oil Wells Subjected to Cyclic Steam Injection

et al. 2019

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High-temperature conditions drastically compromise the physical properties of cement, especially, its strengths. In this work, the influence of adding nanoclay (NC) particles to Saudi class G oil well cement (OWC) strength retrogression resistance under high-temperature condition (300 °C) is evaluated. Six cement slurries with different concentrations of silica flour (SF) and NC were prepared and tested under conditions of 38 °C and 300 °C for different time periods (7 and 28 days) of curing. The changes in the cement matrix compressive and tensile strengths, permeability, loss in the absorbed water, and the cement slurry rheology were evaluated as a function of NC content and temperature, the changes in the structure of the cement surfaces were investigated through the optical microscope. The results revealed that the use of NC (up to 3% by weight of cement (BWOC)) can prevent the OWC deterioration under extremely high-temperature conditions. Incorporating more than 3% of NC severely damaged the cement matrix microstructure due to the agglomeration of the nanoparticles. Incorporation of NC particles increased all the cement slurry rheological properties.

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A New Model for Optimal Mechanical and Thermal Performance of Cement-Based Partition Wall

Cited by 4 publications

References 40 publications

Early‐Age Cracking Analysis of a HVFA Concrete Structure Based on Thermo‐Hygro‐Mechanical Modeling Combined with XFEM

Early‐Age Cracking Analysis of a HVFA Concrete Structure Based on Thermo‐Hygro‐Mechanical Modeling Combined with XFEM

Analysis for Thermal Performance and Energy-Efficient Technology of Prefabricated Building Walls

Influence of Nanoclay Content on Cement Matrix for Oil Wells Subjected to Cyclic Steam Injection

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