Time-Dependent Behavior of Self-Consolidating Concrete Loaded at Early Age: Influence of Chemical Admixtures

Ghezal, Aïcha F.; Assaf, Gabriel J.

doi:10.1061/(asce)mt.1943-5533.0001308

Cited by 11 publications

(3 citation statements)

References 13 publications

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“…The midspan deflection of the concrete beam caused by the external load can be obtained by deducting the measured deflection of the loaded beam by that of the unloaded beam, which is displayed in Figure 2 b . It can be seen that the midspan deflection caused by external load under drying condition is greater than that under the sealed condition, which is consistent with the findings of Ghezal and Assaf ( 19 ).…”

Section: Flexural Creep Testsupporting

confidence: 90%

“…For the drying case, the top and bottom surfaces were exposed to the environment with RH = 50% and temperature of 23°C and other faces of the concrete beams were sealed to ensure a symmetric drying condition. Since the drying of all the concrete beams is symmetric and the shrinkage deformation is not reinforced, the shrinkage strain has a negligible effect on the measured deflection of concrete beams ( 19 ). All flexural creep tests started at 7 days and the measuring duration was about 30 days.…”

Section: Flexural Creep Testmentioning

confidence: 99%

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Performance Evaluation of Concrete Pavement Slab Considering Creep Effect by Finite Element Analysis

Liang

Wei

et al. 2018

Transportation Research Record

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Creep, as an intrinsic property of concrete material, will inevitably affect the performance of concrete pavement slabs in the field. However, the creep effect on the performances of concrete pavement slabs is far from being fully investigated. In this study, a test set-up is designed to measure the flexural creep of concrete beams exposed to both sealed and drying conditions. The measured flexural creep results are then modeled by the microprestress–solidification theory-based creep model which is incorporated into finite element analysis to evaluate numerically the creep effect on the moisture warping deformation, warping stress, and the total stress under traffic load in concrete slabs. Parameters including slab size, slab thickness, and subgrade modulus are considered. It is found that concrete creep has a significant effect on slab performance. Based on the measured creep properties in this study, the warping deformation of slabs can be reduced by 8–62%, and the warping stress and the total stress can be relaxed by at least 50%. Therefore, it is of importance to incorporate creep effect in analyzing warping deformation and stress generated in concrete pavement slabs. This study also provides a numerical methodology to the current performance evaluation of concrete slabs in the field.

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Section: Flexural Creep Testsupporting

confidence: 90%

Section: Flexural Creep Testmentioning

confidence: 99%

Performance Evaluation of Concrete Pavement Slab Considering Creep Effect by Finite Element Analysis

Liang

Wei

et al. 2018

Transportation Research Record

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“…As for tests about consolidation and creep behavior, Jia et al [ 30 ] conducted a series of triaxial unloading tests with frozen clay subjected to long-term high-pressure K 0 consolidation before freezing, which indicated that the creep behavior of frozen clay is affected by the consolidation time and consolidation stress. Ghezal et al [ 31 ] used chemical admixtures and commercially ternary blended cements to produce self-consolidating concrete, which showed that the magnitude of flexural creep varies widely depending on the properties of the polycarboxylic chemical admixture in use. Kamoun et al [ 32 ] carried out disturbed clay samples to analyze their creep behavior, which showed that the variation of axial creep strain is correlated with time in a semi-logarithmic function.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Consolidation-Creep Behavior of Subgrade Modified Soil in Seasonally Frozen Areas

Wang

Pang

et al. 2021

Materials

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Frost heaving and boiling are the most common road disorders due to the special climatic conditions in a seasonal frozen area. From the perspective of controlling road disorders in seasonally frozen areas and making effective use of industrial waste residue, two kinds of subgrade modified soil—crumb rubber modified fly ash soil (CRFS) and oil shale waste residue modified fly ash soil (OSFS)—were proposed by the research group. The research results proved that the two new subgrade fillers both have excellent engineering characteristics in cold areas, such as high strength and low thermal conductivity, and both have the function of waste utilization, giving them broad application prospects. In road engineering, the instability of slopes and retaining walls and the uneven settlement of the subgrade are closely related to soil creep, which are problems that cannot be ignored in road design and use. As a new material to treat road disorders in seasonally frozen areas, more attention should be paid to the continuous deformation property of modified soil under long-term load. The study on the creep characteristics of the modified soil can provide reliable parameters for the design of the modified soil subgrade and predict the settlement of the subgrade after construction, which is of great significance to the stability of the subgrade. In this paper, an experimental study on the consolidation–creep characteristics of two kinds of subgrade modified soil in a seasonal frozen region was carried out, the relationship between modified soil deformation and time is discussed, and the effects of different moisture contents and compaction degrees on the creep characteristics of modified soil were analyzed. The test results provide parameters for the engineering design of modified soil subgrade and provide data support for the popularization and application of modified soil in seasonally frozen subgrade.

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Testing and Analysis of Micro Creep

Wei¹,

Liang²,

Kong³

2022

Mechanical Properties of Cementitious Materials at Microscale

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Time-Dependent Behavior of Self-Consolidating Concrete Loaded at Early Age: Influence of Chemical Admixtures

Cited by 11 publications

References 13 publications

Performance Evaluation of Concrete Pavement Slab Considering Creep Effect by Finite Element Analysis

Performance Evaluation of Concrete Pavement Slab Considering Creep Effect by Finite Element Analysis

Experimental Study on Consolidation-Creep Behavior of Subgrade Modified Soil in Seasonally Frozen Areas

Testing and Analysis of Micro Creep

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