scholarly journals Failure Criteria and Constitutive Relationship of Lightweight Aggregate Concrete under Triaxial Compression

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 507
Author(s):  
Peihuan Ye ◽  
Yuliang Chen ◽  
Zongping Chen ◽  
Jinjun Xu ◽  
Huiqin Wu
Keyword(s):  
Triaxial Compression ◽  
Lightweight Aggregate ◽  
Confining Pressure ◽  
Failure Criteria ◽  
Constitutive Relationship ◽  
Lightweight Aggregate Concrete ◽  
Stress Strain ◽  
Aggregate Concrete ◽  
Stress Theory ◽  
Relationship Of

This paper investigates the compression behavior and failure criteria of lightweight aggregate concrete (LAC) under triaxial loading. A total of 156 specimens were tested for three parameters: concrete strength, lateral confining pressure and aggregate immersion time, and their effects on the failure mode of LAC and the triaxial stress-strain relationship of LAC is studied. The research indicated that, as the lateral constraint of the specimen increases, the failure patterns change from vertical splitting failure to oblique shearing failure and then to indistinct traces of damage. The stress-strain curve of LAC specimens has an obvious stress plateau, and the curve no longer appears downward when the confining pressure exceeds 12 MPa. According to the experimental phenomenon and test data, the failure criterion was examined on the Mohr–Coulomb theory, octahedral shear stress theory and Rendulic plane stress theory, which well reflects the behavior of LAC under triaxial compression. For the convenience of analysis and application, the stress-strain constitutive models of LAC under triaxial compression are recommended, and these models correlate well with the test results.

scholarly journals Properties of Lightweight Aggregate Concrete Reinforced with Carbon and/or Polypropylene Fibers

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 640 ◽  
Author(s):  
Hui Wei ◽  
Tao Wu ◽  
Xue Yang
Keyword(s):  
Tensile Strength ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Polypropylene Fibers ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Stress Strain ◽  
Aggregate Concrete ◽  
Ductility Index ◽  
Hybrid Forms

The impact of carbon and polypropylene fibers in both single and hybrid forms on the properties of lightweight aggregate concrete (LWAC), including the slump, density, segregation resistance, compressive strength, splitting tensile strength, flexural strength, and compressive stress–strain behavior, were experimentally investigated. The toughness ratio and ductility index were introduced for quantitatively evaluating the energy-absorbing capacity and post-peak ductility. A positive synergistic effect of hybrid carbon and polypropylene fibers was obtained in terms of higher tensile strength, toughness, and ductility. The toughness ratio and ductility index of hybrid fiber-reinforced LWAC were increased by 26%–37% and 12%–27% compared with plain LWAC, respectively. The fiber in both single and hybrid forms had a smaller effect on the linearity ascending branch of the stress–strain curves, whereas the post-peak patterns in terms of the toughness and ductility for the hybrid fiber-reinforced LWAC were significantly improved when the fiber in hybrid form.

Experimental Study of Stress-Strain Curves of Lightweight Aggregate Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 1762-1767 ◽  
Author(s):  
Xiang Liu ◽  
Jiang Tao Kong
Keyword(s):  
Strain Curve ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Concrete Material ◽  
Aggregate Concrete ◽  
Ordinary Concrete ◽  
Strength Grade ◽  
Strain Relationship

According to the contrast test of LC30, LC40 lightweight aggregate concrete and C30, C40 common concrete , the text researched the mechanical property of lightweight aggregate concrete and ordinary concrete in the same strength grade and obtained the regularity of stress-strain curve of lightweight aggregate concrete in different strength grade. Then we contrasted the experimental results and planning model, analysed the difference, and suggested that the standards should improve the descent stage of the stress-strain curve of lightweight aggregate concrete combined with correlative experiments data, and give the equation of the descent stage of stress-strain curves. Concrete material in axial compression is the basic physical mechanical performance of concrete material, and is the main basis for researching bearing capacity and deformation of concrete construction. The stress-strain relationship is all-around macroscopic reaction of basal compressive property . There have been many experiments work about the stress-strain relationship of lightweight aggregate concrete at home and abroad , and found the peak strain of lightweight aggregate concrete is higher than that of ordinary concrete in the context of same peak stress .In this paper, on the basis of experimental investigations of lightweight aggregate concrete , aim at the stress-strain relationship ,we have take comparison experiment about LC30,LC40 lightweight aggregate concrete and C30,C40 ordinary concrete , and sort out stress-strain curve under the condition of the shaft center being compressed, so get the average tress-strain curve of LC30,LC40 lightweight aggregate concrete , and analyse the curve.

Experimental Study on Bond Behavior of Profiled Steel Sheet-Lightweight Aggregate Concrete Composite Slab

2012 ◽  
Vol 594-597 ◽  
pp. 721-724
Author(s):  
Yan Kun Zhang ◽  
Yan Xiao Han ◽  
Ze Zao Song
Keyword(s):  
Experimental Study ◽  
Steel Sheet ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Composite Slab ◽  
Bond Behavior ◽  
Ordinary Concrete ◽  
Relationship Of ◽  
The Relationship

At present, there are much more researches on the ordinary concrete composite slab, and that on the lightweight aggregate concrete composite slab are relatively less. In this paper, the shear-bond behavior of lightweight aggregate concrete composite slab, with the profiled steel sheet YX-76-344-688, which is commonly used in China is studied. Base on experiments, the cracks developing process and its regularities of distribution, the bonding and slipping between profiled sheeting and concrete, the relationship of load and mid-span deflection, ultimate bearing capacity etc. are studied.

An Egg Shaped Failure Criterion for Lightweight Aggregate Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 2085-2088
Author(s):  
Wan Zhen Wang ◽  
Yuan Jiang Chen ◽  
Fei Yi Chen
Keyword(s):  
Failure Criterion ◽  
Lightweight Aggregate ◽  
Failure Criteria ◽  
Yield Function ◽  
Lightweight Aggregate Concrete ◽  
Light Weight ◽  
Experiment Data ◽  
Aggregate Concrete ◽  
Failure Envelopes ◽  
Light Weight Aggregate

Referring to an egg shaped yield function for geotechnical materials, a failure criterion for light-weight aggregate concrete is put forward, in which the tensile and compressive meridians are egg shaped curves and the failure envelopes in deviated plane is smooth elliptic curves. The suggested failure criteria could describe the failure characteristic of lightweight aggregate concrete at different stress state. The precision of the suggested egg shaped failure criteria is verified by comparing with experiment data of lightweight aggregate concrete.

Compressive Strength of Organic Lightweight Aggregate Concrete

2011 ◽  
Vol 374-377 ◽  
pp. 1531-1536
Author(s):  
Cong Mi Cheng ◽  
Da Gen Su ◽  
Juan He ◽  
Chu Jie Jiao
Keyword(s):  
Compressive Strength ◽  
Relative Density ◽  
Lightweight Aggregate ◽  
Cement Matrix ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Slowing Down ◽  
Density Relationship ◽  
The Difference ◽  
Relationship Of

Organic lightweight aggregate concrete (OAC) is produced by replacing normal aggregate with organic aggregate in concrete or mortar either partially or fully, depending on the requirements of the strength and density. The study aims to investigate the compressive strength of OAC containing virgin EPS beads, recycled EPS granules and rubber granules with diameter 3-5 mm, and the influence of cement matrix on compressive strength of OAC. The results show that compressive strength of OAC decreases as organic aggregate content increases; furthermore, the decreasing rate of the strength is slowing down. The dimensionless compress strength-density relationship of EPS lightweight aggregate concrete (PAC) containing virgin EPS, recycled EPS and different cement matrix has uniform law. It can be modeled as σ*pl/σs=0.916(ρ*/ρs)3.04. The experimental compressive strength of ultra-lightweight EPS concrete with density lower than 900 kg/m3is much higher than the value calculated by Gibson formula. The larger the relative density is, the greater the difference between the two is. The dimensionless compressive strength-density relationship of rubcrete can be modeled as σ*pl/σs=0.956(ρ*/ρs)8.66. The compressive strength of rubcrete, compared with PAC, is more sensitive to the relative density.

scholarly journals The Study on the Whole Stress–Strain Curves of Coral Fly Ash-Slag Alkali-Activated Concrete under Uniaxial Compression

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4291
Author(s):  
Huailiang Wang ◽  
Lang Wang ◽  
Lei Li ◽  
Baoquan Cheng ◽  
Yonggang Zhang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Uniaxial Compression ◽  
Peak Stress ◽  
Constitutive Relationship ◽  
Lightweight Aggregate Concrete ◽  
Loading Test ◽  
Stress Strain ◽  
Aggregate Concrete ◽  
Alkali Activated Concrete ◽  
Alkali Activated

This study aimed to research the whole stress–strain curves of coral Fly Ash-Slag Alkali-Activated Concrete (CAAC) in different strength grades. Fly ash-slag alkali-activated concrete was used as cementing materials to produce coral aggregate concrete. A monotonic loading test was conducted on the prismatic specimens to obtain elastic modulus (Ec), Poisson’s ratio (μ) and the constitutive relationship of CAAC under uniaxial compression. When the strain of CAAC reached the maximum value, the specimen was split and damaged rapidly. As the strength grade increased, the ratio of residual stress (σri) to peak stress (σ0i) decreased in the range of 0.17–0.28. The Ec of CAAC increased gradually, and μ increased to the peak value and then decreased. According to the test results, the constitutive equation of CAAC can be expressed by piecewise expression, which can better reflect all the experimental characteristics. It was also found that CAAC has many similar characteristics with coral concrete and lightweight aggregate concrete. To improve the strength and toughness of CAAC, some fibers, such as organic fiber, can be added to expand the application of CAAC in engineering projects.

scholarly journals Evaluation of Stress–Strain Behavior of Self-Compacting Rubber Lightweight Aggregate Concrete under Uniaxial Compression Loading

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4064 ◽  
Author(s):  
Jing Lv ◽  
Tianhua Zhou ◽  
Qiang Du ◽  
Kunlun Li ◽  
Kai Sun
Keyword(s):  
Compressive Strength ◽  
Failure Modes ◽  
Experimental Studies ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Peak Strain ◽  
Stress Strain ◽  
Aggregate Concrete ◽  
Rubber Particles ◽  
Strain Relationship

The recycling of waste tires in lightweight aggregate concrete (LC) would achieve huge environmental and societal benefits, but the effects of rubber particles on the partial properties of LC are not clear (e.g., the stress–strain relationship). In this paper, uniaxial compressive experiments were conducted to evaluate the stress–strain relationship of self-compacting rubber lightweight aggregate concrete (SCRLC). Rubber particles were used to replace sand by volume, and substitution percentages of 0%, 10%, 20%, 30%, 40%, and 50% were set as influence factors. Experimental results indicate that with increased rubber particles substitution percentage, the cubic compressive strength and axial compressive strength of SCRLC decreased, while the failure modes of SCRLC prism specimens gradually changed from brittle to ductile failure. As the rubber particles substitution percentage increased from 0% to 50%, the peak strain of SCRLC increased whereas peak stress, elastic modulus, and peak secant modulus of SCRLC deceased, the descending stage of stress–strain curves became softer. The rubber particles substitution percentage of 30% was the critical point at which an obvious change in the properties of SCRLC occurred. Based on the data collected from experimental studies, a predictive model for SCRLC was established and a further prediction of the SCRLC stress–strain relationship was given.

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