Effects of early-age thermal microcracking on material properties and structural performance of limestone aggregate concrete

2021 ◽  
pp. 104267
Author(s):  
Do Bui Cong ◽  
Kenichiro Nakarai ◽  
Hiroki Nishikawa
Keyword(s):  
Material Properties ◽  
Structural Performance ◽  
Early Age ◽  
Aggregate Concrete ◽  
Limestone Aggregate

scholarly journals Multiscale Contribution of Bone Tissue Material Property Heterogeneity to Trabecular Bone Mechanical Behavior

2015 ◽  
Vol 137 (1) ◽  
Author(s):  
Ashley A. Lloyd ◽  
Zhen Xiang Wang ◽  
Eve Donnelly
Keyword(s):  
Material Properties ◽  
Experimental Studies ◽  
Heterogeneous Material ◽  
Structural Performance ◽  
Apparent Stiffness ◽  
Potential Contributor ◽  
Homogeneous Models ◽  
Fracture History ◽  
Tissue Material ◽  
Better Than

Heterogeneity of material properties is an important potential contributor to bone fracture resistance because of its putative contribution to toughness, but establishing the contribution of heterogeneity to fracture risk is still in an incipient stage. Experimental studies have demonstrated changes in distributions of compositional and nanomechanical properties with fragility fracture history, disease, and pharmacologic treatment. Computational studies have demonstrated that models with heterogeneous material properties predict apparent stiffness moderately better than homogeneous models and show greater energy dissipation. Collectively, these results suggest that microscale material heterogeneity affects not only microscale mechanics but also structural performance at larger length scales.

scholarly journals A Review on the Mechanisms and Analysis of Fatigue in Ductile Materials

2021 ◽  
Author(s):  
Amal A ◽  
Mohammed Thowsif
Keyword(s):  
Fatigue Life ◽  
Material Properties ◽  
Fatigue Performance ◽  
Structural Performance ◽  
Cyclic Loads ◽  
Key Factors ◽  
Engineering Structure ◽  
Ductile Materials ◽  
Engineering Component ◽  
Load Pattern

In civil engineering, fatigue can be referred to as the loss in structural performance of engineering components when subjected to repeated cyclic loads. Fatigue is identified as one of the leading factors that determines the lifespan of an engineering structure. Fatigue develops in the form of small and localized cracks which gradually propagates subcritically until the engineering component is structurally incapable to satisfy the serviceability conditions and ultimately fails. Due to the engineering importance of the phenomenon, fatigue is studied extensively in order to obtain a better understanding of the phenomenon and its manifestation in different engineering components. Over the years a number of mechanisms and models have been developed in order to explain, analyze and predict the effects of the phenomenon on various components. The three key factors that have been identified to have influenced the fatigue life of engineering components include the material properties of the engineering component, the geometry of the engineering component and the load pattern to which the engineering component is subjected. This paper aims to give a brief and consolidated overview of the various mechanisms, the different models and the influence of the various factors on the fatigue performance of components composed of ductile materials.

Performance Study of a Steel-Concrete Joint for Hybrid Cable-Stayed Bridge with 800m Main Span

2019 ◽  
Author(s):  
Xianming Yu ◽  
Dewei Chen
Keyword(s):  
Cross Sections ◽  
Material Properties ◽  
Structural Performance ◽  
Environmental Constraints ◽  
Performance Study ◽  
Detailed Design ◽  
Bearing Plate ◽  
Cable Stayed Bridge ◽  
Steel Truss ◽  
Concrete Deck

<p>Yachihe Bridge is a record‐breaking cable‐stayed bridge with 800m steel truss deck in the main span. As the bridge side spans are limited in size due to environmental constraints, 220m concrete decks are the optimized solutions for the side spans to balance the weight of steel truss deck in the main span. The joint of concrete deck and steel truss deck is one of the most complex points of the bridge, as it bears the maximum axial force and the structural cross sections, rigidities and material properties are changed at this position. This paper mainly presents the detailed design and numerical analysis for the steel‐concrete joint of Yachihe Bridge to investigate its structural performance. Meanwhile, the numerical results of concrete and steel decks, bearing plate and shear studs of the joint are also discussed.</p>

Internal Relative Humidity and Drying Shrinkage of Lightweight Aggregate Concrete

2014 ◽  
Vol 629-630 ◽  
pp. 473-480
Author(s):  
Xiu Hua Zheng ◽  
Yu Feng Zhai ◽  
Shi Zuo Zhan ◽  
Shu Jie Song
Keyword(s):  
Relative Humidity ◽  
Early Stage ◽  
Drying Shrinkage ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Early Age ◽  
Aggregate Concrete ◽  
Cement Ratio ◽  
Air Content ◽  
Internal Relative Humidity

In this paper, the influence of water cement ratio, prewetting degree of lightweight aggregate, flyash content and air content on the internal relative humidity (IRH) and drying shrinkage of lightweight aggregate concrete (LAC) were studied using a relative humidity sensor and drying shrinkage apparatus. Results showed that the IRH of concrete decreased rapidly at early age and slowed down at late age, and prewetting lightweight aggregate could compensate the loss of IRH. The effect of compensation could be enhanced with the increasing of prewetting degree of lightweight aggregate, and the addition of flyash retarded the decrease of IRH at early age. The drying shrinkage of LAC increased quickly at early stage and it slowed down to the even after 60 days or longer age. Furthermore, the drying shrinkage of LAC increased with increasing of water cement ratio. The effect of air content on the drying shrinkage of LAC was limited at early stage. However, at the late stage it grew at different level with increasing of air content. By raising the prewetting degree of lightweight aggregate, mixing with proper dosage of flyash, the shrinkage rate of LAC can be reduced markedly. Key words: lightweight aggregate concrete, internal relative humidity, drying shrinkage, prewetting degree, flyash.

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