Development of lightweight strain hardening cementitious composite for structural retrofit and energy efficiency improvement of unreinforced masonry housings

Zhu, Honggang; Wan, Kai Tai; Satekenova, Elnara; Zhang, Dichuan; Leung, Christopher Kin Ying; Kim, Jong Ryeol

doi:10.1016/j.conbuildmat.2018.02.033

Cited by 37 publications

(6 citation statements)

References 53 publications

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Section: Thermal Propertiesmentioning

confidence: 99%

“…Concrete is a composite material with different components, such as cement, aggregates, water, and other additives, which have different chemical and physical properties. The thermal properties of concrete are affected by the thermal and physical properties of its components, as well as density, moisture, and temperature [19,[22][23][24]. For ambient moisture conditions and temperatures less than 150 • C, the thermal conductivity ranges from 1.0 to 2.3 W/m• • C for normal strength concrete according to Eurocode-2 [25], Shin et al [26], and Lie and Kodur [27]; and from 2.0 to 3.2 W/m• • C for high strength concrete according to Zheng [28], Ju et al [29], and Kodur and Khaliq [30].…”

Section: Thermal Propertiesmentioning

confidence: 99%

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Temperature Distributions inside Concrete Sections of Renewable Energy Storage Pile Foundations

et al. 2019

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A new pile foundation system is being developed for renewable energy storage through a multi-disciplinary research project. This system utilizes the compressed air technology to store renewable energy inside the reinforced concrete pile foundation configured with hollowed sections. The compressed air can result in high air pressure to which the structural response of the pile foundation subjected has been studied. However, the temperature in the pile foundation can be affected by the compressed air if sufficient cooling is not provided. The temperature change can generate thermal stresses and affect the structural safety of the pile foundation. As a first step to investigate this thermal effect, this paper studies temperature distributions inside the concrete section for the pile foundation through non-steady state heat transfer analyses. Several parameters were considered in the study, including thermal conductivities of the concrete, specific heat capacities of the concrete, and dimensions of the pile foundation. It has been found that the temperature distribution along the concrete section varies significantly during a daily energy storage cycle as well as subsequent cycles due to the cumulative effect of residual temperatures at the end of each cycle. The temperature distribution is largely affected by the thermal conductivity of the concrete and the geometry of the pile foundation. The obtained temperature distribution can be used for investigation of the thermal stress inside the foundation and surrounding soil.

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Section: Thermal Propertiesmentioning

confidence: 99%

Section: Thermal Propertiesmentioning

confidence: 99%

Temperature Distributions inside Concrete Sections of Renewable Energy Storage Pile Foundations

et al. 2019

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“…The strain hardening material is modeled as reinforced smeared crack elements. The properties are obtained from the tests conducted by Nematollahi et al [11] and Zhu et al [12], and summarized in Table 2. The properties of the reinforcement including tensile stressstrain inputs and volumetric ratio are calibrated to correspond to the results of the direct tensile tests.…”

Section: Model Development and Study Descriptionmentioning

confidence: 99%

Analytical Investigation of Seismic Performance of Masonry Walls Strengthened With Strain Hardening Fiber Reinforced Geopolymer Matrix

Satekenova

Zhang

Kim

et al. 2018

WIT Transactions on the Built Environment

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Strain hardening fiber reinforced geopolymer matrix, termed here as strain hardening material, is being proposed as a new seismic retrofitting material. Seismic behavior of the masonry walls with and without the strain hardening material was evaluated through finite element simulations in this paper. The finite element simulation was conducted on a masonry wall model with smeared crack material properties. The effectiveness of the strain hardening material for enhancing the seismic capacity of the masonry wall was evaluated through pushover analyses. Several parameters are considered in the pushover analysis including thickness and mechanical properties of the strain hardening material, wall geometries and loading directions. The force-displacement response obtained from the pushover analysis was used to develop a simplified multi-degree spring model. Nonlinear dynamic time history analyses were conducted using the spring model to evaluate the seismic demand of masonry structures strengthened with the strain hardening material. From the simulation results, it has been found that the strain hardening material can significantly improve the strength and ductility of the masonry wall under earthquakes. Design recommendations are made for retrofitting masonry structures using the proposed strain hardening material.

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“…It is of great interest to improve the mechanical properties of LCM with higher strength and ductility. Zhu et al [9] developed a series of lightweight cement composites by incorporating hollow glass bubbles. The compressive strength of 100 mm cubes was in the range of 14-31 MPa with a density below 1500 kg/m 3 .…”

Section: Introductionmentioning

confidence: 99%

Development of Ultra-Lightweight and High Strength Engineered Cementitious Composites

Chen,

Li,

Yang

2021

J. Compos. Sci.

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In this study, ultra-lightweight and high strength Engineered Cementitious Composites (ULHS-ECCs) are developed via lightweight filler incorporation and matrix composition tailoring. The mechanical, physical, and micromechanical properties of the resulting ULHS-ECCs are investigated and discussed. ULHS-ECCs with a density below 1300 kg/m3, a compressive strength beyond 60 MPa, a tensile strain capacity above 1%, and a thermal conductivity below 0.5 w/mK are developed. The inclusion of lightweight fillers and the variation in proportioning of the ternary binder can lead to a change in micromechanical properties, including the matrix fracture toughness and the fiber/matrix interface properties. As a result, the tensile strain-hardening performance of the ULHS-ECCs can be altered.

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Development of lightweight strain hardening cementitious composite for structural retrofit and energy efficiency improvement of unreinforced masonry housings

Cited by 37 publications

References 53 publications

Temperature Distributions inside Concrete Sections of Renewable Energy Storage Pile Foundations

Temperature Distributions inside Concrete Sections of Renewable Energy Storage Pile Foundations

Analytical Investigation of Seismic Performance of Masonry Walls Strengthened With Strain Hardening Fiber Reinforced Geopolymer Matrix

Development of Ultra-Lightweight and High Strength Engineered Cementitious Composites

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