A long term restrained shrinkage study of concrete slabs on ground

Shadravan, Shideh; Ramseyer, Chris; Kang, Thomas H.‐K.

doi:10.1016/j.engstruct.2015.08.018

Cited by 28 publications

(22 citation statements)

References 2 publications

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“…Many studies show that the deterioration of concrete would be aggravated in harsh environment, especially under freeze–thaw cycles, drying–wetting cycles, and sulfate attack . Some researches also indicate that tensile stress and swelling stress would generate when concrete is constrained, and cracks would produce more rapidly than those under unconstrained condition . It is essential to predict and evaluate the damage results of concrete, especially the concrete under restricted condition, in a certain period of time under drying–wetting cycles and sulfate attack.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] Some researches also indicate that tensile stress and swelling stress would generate when concrete is constrained, and cracks would produce more rapidly than those under unconstrained condition. [6][7][8] It is essential to predict and evaluate the damage results of concrete, especially the concrete under restricted condition, in a certain period of time under drying-wetting cycles and sulfate attack.Many studies show that, the deformation, 9 damage rate (ultrasonic velocity method), 10 mass loss, and loss rate of strength 11 can be used to predict and evaluate the deterioration results of concrete. There are many testing standards in concrete exposed to sulfate attack, such as American standards ASTM C1012 12 and Chinese national standards GB/T 749-2008.…”

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confidence: 99%

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Study on the deterioration process of cement‐based materials under sulfate attack and drying–wetting cycles

Chen

Huang

Qian

2017

Structural Concrete

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In this paper, the deterioration process of mortars degraded by sulfate under the restricted and unconstrained condition was investigated, respectively. Sodium sulfate (5 wt%) and dry–wet circulation method was adopted to accelerate the deterioration process. The deformation, damage rate, and porosity were measured by linear variable differential transducers (LVDTs), ultrasonic velocity measuring technology, and X‐ray computed tomography (XCT), respectively. Mass loss and loss rates of flexural strength and compressive strength were also measured to evaluate the deterioration results. Scanning electron microscope (SEM), energy‐dispersive Spectrometer (EDS), and X‐ray diffraction (XRD) were used to analyze the degradation mechanisms. The experimental results indicate that the greater the water–cement (w/c) ratio of mortars, the more serious the deterioration. XCT images and analysis results of porosities show that, among the mortars after being degraded by sulfate solution for 360 drying–wetting cycles, the M30‐SR sample under restricted condition is deteriorated most seriously. SEM/EDS and XRD analysis results indicate that the microstructure of hydration products changed obviously. Sodium sulfate and gypsum are observed after being degraded by sodium sulfate.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Study on the deterioration process of cement‐based materials under sulfate attack and drying–wetting cycles

Chen

Huang

Qian

2017

Structural Concrete

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“…Also, Shadravan et al [6] investigated the full scale behavior of concrete slabs on ground in a controlled environment in terms of different concrete materials properties and the evaluating their performance as real slabs which exposed to the controlled environment and ground moisture from the top and bottom, respectively. But the shape or morphology of shrinkage cracks were not studied.…”

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confidence: 99%

“…Majority of the previous studies addressed the creep, shrinkage and cracking of high performance restrained concrete as well as the impact of aggregate size and paste volume on drying shrinkage micro-cracking in cement-based composites using methods such as image analysis, a modified Weibull function, and scanning electron microscopy [1][2][3][4][5][6][7][8]. Although some researchers studied the type of shrinkage cracks for unrestrained cement paste or concrete samples, their tests were under very dry conditions, which rarely occur in concrete structures [4,[9][10].…”

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confidence: 99%

Assessment of shrinkage-induced cracks in restrained and unrestrained cement-based slabs

Ababneh

Al-Rousan

Alhassan

et al. 2017

Construction and Building Materials

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“…Behaviour of the floor slab depends on its load values (Concrete Society 2003), the layout and stiffness of the piles, and the thickness of the slab (Shadravan et al 2015).…”

Section: Influence Of Pile Settlements On the Slab Behaviourmentioning

confidence: 99%

Influence of the Pile Stiffness on the Ground Slab Behaviour

Urbonas

Sližytė

Mackevičius

2016

Journal of Civil Engineering and Management

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Abstract. Just as other structural elements, ground slabs are an important unit of a building. It is especially true in the case of buildings, such as logistic centres, for which the primary purpose is storage of various goods. In this kind of buildings, floor slabs usually have high loads. For buildings where truck lifts are used, there are special requirements for flatness tolerance across and along the driving track of truck lifts. Therefore, the floor settlement differences in selected distances are limited. In localities where the soils under the floor slab are weak, they should be replaced or compacted. If these solutions are not possible or economically inappropriate, the slabs have to be supported on piles that must be based on strong deep soils. During the design process, it is very important to assign a proper value of rigidity of the piles. Pile stiffness has an enormous influence on the settlement of the slab as well as on the reinforcement intensity of the slab or even on the slab thickness. This paper presents the methodology for the evaluation of pile stiffness. In addition, it provides recommendations for the calculation of the floor slab on the piles. Calculations and obtained results confirmed the importance of certain design stages.

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A long term restrained shrinkage study of concrete slabs on ground

Cited by 28 publications

References 2 publications

Study on the deterioration process of cement‐based materials under sulfate attack and drying–wetting cycles

Study on the deterioration process of cement‐based materials under sulfate attack and drying–wetting cycles

Assessment of shrinkage-induced cracks in restrained and unrestrained cement-based slabs

Influence of the Pile Stiffness on the Ground Slab Behaviour

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