Dissertations / Theses on the topic 'Cement creep'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 22 dissertations / theses for your research on the topic 'Cement creep.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Al-Kaisi, Ali Farhan. "Early age strength and creep of slag cement concretes." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329041.
Full textBoukendakdji, Mustapha. "Mechanical properties and long-term deformation of slag cement concrete." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236998.
Full textNguyen, Dan-Tam. "Microindentation Creep of Calcium-Silicate-Hydrate and Secondary Hydrated Cement Systems." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31519.
Full textDias, Wiranjith Priyan Solomon. "Time dependent deformations of hardened cement paste from 20°C to 725°C." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37992.
Full textBarker, D. S. "A numerical analysis of the effect of surface finish and cement creep in cemented total hip replacement /." Title page, abstract and contents only, 1996. http://web4.library.adelaide.edu.au/theses/09ENS/09ensb255.pdf.
Full textAili, Abudushalamu. "Shrinkage and creep of cement-based materials under multiaxial load : poromechanical modeling for application in nuclear industry." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1014/document.
Full textThe main interest of the thesis is the long-term mechanical behavior of the containment building of french nuclear power plants. The containment buildings of the power plants are biaxially prestressed concrete structures. Therefore, we summarize the problem of interest into two following key points: biaxiality of load and long-term delayed strain.In order to characterize the delayed strain under biaxial load, our study first concentrates on the viscoelastic Poisson's ratio of concrete. In this purpose, we start by scrutinizing the definition of Poisson's ratio in non-aging linear isotropic viscoelasticity. Then, from the analysis of experimental results from the literature, we can obtain the viscoelastic Poisson's ratio of concrete. As an extension, we use micromechanics to shed some light on the long-term creep mechanism of the C-S-H gel.In a second step, we aim at proposing a poroviscoelastic model without postulating a priori the classical decomposition of delayed strains. We start by identifying the major experimental tendencies and physical phenomena that we aim at capturing with the model. From experimental data of autogenous shrinkage and basic creep from the literature, we analyze the possible physical origin of long-term autogenous shrinkage. In the end, a physics-based poroviscoelastic model is proposed, derived from the poromechanics theory. The prediction of the model is compared with experimental results from literature
Gul, Waqar Ahmed Waqar. "Effect Of Recycled Cement Concrete Content On Rutting Behavior Of Asphalt Concrete." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609765/index.pdf.
Full textLopez, Mauricio. "Creep and Shrinkage of High Performance Lightweight Concrete: A Multi-Scale Investigation." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-11222005-122831/.
Full textKurtis, Kimberly E., Committee Co-Chair ; Kahn, Lawrence F., Committee Co-Chair ; Lai, James S., Committee Member ; Gokhale, Arun M., Committee Member ; Castrodale, Reid W., Committee Member. Vita.
Tamtsia, Tamboue Basile-Honore. "The role of C-S-H microstructure and calcium hydroxide on creep and shrinkage of hardened portland cement paste." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/6087.
Full textDelsaute, Brice. "New approach for Monitoring and Modelling of the Creep and Shrinkage behaviour of Cement Pastes, Mortars and Concretes since Setting Time." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/241829.
Full textDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Delsaute, Brice. "New approach for Monitoring and Modeling of the Creep and Shrinkage behaviour of Cement Pastes, Mortars and Concretes since Setting Time." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1104/document.
Full textFor usual concrete structure built in several phases, concrete deformations are restrained during the hardening process. When shrinkage is restrained, tensile stresses are induced and a cracking risk occurs. Modelling the evolution of an early age set of parameters on concrete is necessary to predict the early age behaviour of concrete structures. The difficulty lies in the fact that the modelling of concrete properties must be based on experimental data at early age and this data must be obtained automatically because the hardening process of the concrete takes place rapidly during the first hours and also the first days. The thesis deals with experimental and numerical study of the early age properties of cement based materials and more specifically the development of the autogenous deformation, the coefficient of thermal expansion, the E-modulus and the basic creep in compression and tension. For this purpose, a comprehensive work was carried out at ULB and Ifsttar involving the development of a new approach with new test procedures and the design of new testing devices to generate experimental data since the setting of the material. The methodology is based on two repeated testing methods. For the characterization of the viscoelastic behaviour of a concrete since setting, a permanent loading coupled to a test with repeated minute-long loadings is needed. Whereas, the autogenous strain, the coefficient of thermal expansion and the setting are characterized with repeated thermal variations on a concrete sample. The new approach was defined on an ordinary concrete and then extended to the study of the following parameters: the water-cement ratio, the restrained effect of aggregate on the cement paste in the development of concrete properties at early age, the substitution of cement by mineral addition and the difference of behaviour in tension and in compression. Based on these experimental results, new models were developed for the characterization of the early age properties of cement based materials since setting time. An adapted version of the Model Code 2010 for the modelling of basic creep is also proposed
Johansson, Emil, and Hedén Victor Granlund. "Numerisk beräkning av krypsättningar i pelarförstärkt lera." Thesis, KTH, Jord- och bergmekanik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298990.
Full textThis master thesis investigates the suitability of using multicement, a mixture of cement and cement kiln dust (CKD), for deep cement mixing (DCM) as soil improvement in an area with high requirements regarding the maximum allowed settlements. This was done by numerical modelling of long-term settlement behaviour for a DCM improved soil. Furthermore, the usability of different material models when considering creep behaviour are studied. The report also investigates whether creep behaviour should be considered or not in this type of simulation. The simulations are done according to the geotechnical conditions and the planned design for an old gallop track in Täby Park, Sweden. A literature review is done as a basis for the simulations performed in Plaxis 2D with an axis symmetric 2D-model. The use of Mohr-Coulomb (MoC), Soft SoilCreep (SSC) and Concrete Model (CM) for the columns are motivated. Creep settlements are included in the clay for all simulations while the columns are simulated both with and without creep settlements. To ensure the suitability of the model, a calibration is done by replication of a research study as well as replication of settlement calculations of the unimproved clay on Galoppfältet. Thereafter different geometric options for the columns and varying fill depths are simulated. Lastly a sensitivity analysis is conducted to display how much the uncertain material properties affect the result. Using multicement columns (MC columns) for DCM seems to be a good method for stabilizing the soil in Galoppfältet to achieve small settlements over time. For columns with a diameter of 800 mm and a center distance of 1200 mm the following settlements were calculated with the different material models for different fill heights. This geometry was considered most suitable for the conditions at Galoppfältet. The two material models which account for creep in the columns show significantly different levels of total settlement. Due to lack of material data the results from simulations with SSC is deemed incorrect and thus not shown in the abstract. Thereby the results from MoC and CM without creep are deemed most credible even though they may be slightly low since they do not consider creep settlements in the columns. Furthermore, the Concrete Model is considered a good model to simulate settlements including creep in improved clay given that the material properties are carefully selected based on testing of the material. Soft Soil Creep may potentially be suitable for columns according to the calibration given that the different material parameters are investigated for the local conditions. However, CMare favoured. Mohr-Coulomb is deemed as a good model if creep settlements are neglected. With regards to this, the authors believe that creep tests of multicement columns should be considered to create improved preconditions for dimensioning of DCM columns with creep. This to improve the accuracy of design and potentially create cost reductions.
Venditti, N. P. "The creep behaviour of polyethylmethacrylate based bone cements." Thesis, Swansea University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639308.
Full textRhardane, Abderrahmane. "Elaboration d’une approche micromécanique pour modéliser l’endommagement des matériaux cimentaires sous fluage et cycles de gel-dégel." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0060/document.
Full textNumerical modelling of the constitutivebehaviour of cementitious materials exposed to aggressive environment offers an alternative point of view for the identification and assessment of internal mechanisms which cannot be explicitly explored using standard experimental techniques. In this regard, the development of advanced modelling tools that take into account the interactions between the heterogeneous microstructure of cement paste and the macroscopic behaviour cementitious materials is highly valued. Such modelling approaches give a much better description of the physical processes and avoid recurrent parameter calibration when dealing with a different microstructure.The work presented in this PhD thesis proposes a numerical modelling approach of damage in cement based materials taking heed of the physical mechanics that can only be characterized at the microscopic level. In the proposed approach, the principles of constructing a virtual microstructure of cement paste are laid out and the micromechanical parameters of cement phases are identified. The predictive capacity of the micromechanical approach is put to the test by a comparison of numerical results with experimental data determined in the present study and found in the literature. Finally, the power of the approach is illustrated through simulations of creep and freeze-thaw behaviour at the microscopic scale of cement paste.This approach paves the way for a multitude of applications, such as the study of the effect of shrinkage, creep, freeze-thaw cycles, thermal cracking, self-healing and carbonation on the thermomechanical properties of cement-based materials
Darquennes, Aveline. "Comportement au jeune âge de bétons formulés à base de ciment au laitier de haut-fourneau en condition de déformations libre et restreinte." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210239.
Full text1. Lors du suivi du retrait restreint à l’aide de l’essai à l’anneau en condition de dessiccation, le béton formulé à base de ciment au laitier de haut-fourneau a fissuré bien avant le béton formulé à base de ciment Portland.
2. Le retrait total en condition libre du béton formulé à base de ciment au laitier de haut-fourneau est nettement supérieur à celui du béton formulé à base de ciment Portland. Cette différence de comportement est principalement due à l’accroissement rapide et plus élevé du retrait endogène des bétons formulés à base de ciment au laitier de haut-fourneau.
Au vu de ces résultats expérimentaux, il a semblé intéressant de déterminer quel était l’impact de la déformation endogène des bétons formulés à base de ciments au laitier de haut-fourneau (CEM III) sur leur sensibilité à la fissuration. Afin de répondre à cette question, les déformations différées (retrait endogène, fluage propre en compression et en traction) au jeune âge de trois compositions de béton avec différentes teneurs en laitier (0, 42 et 71%) ont été étudiées expérimentalement en conditions libre et restreinte. Cependant, le suivi du retrait endogène libre et restreint a nécessité le développement de plusieurs dispositifs expérimentaux limitant au maximum les artefacts de mesure, tels que la TSTM (Temperature Stress Testing Machine). De plus, l’interprétation de ces résultats expérimentaux a également nécessité une caractérisation du comportement de ces matériaux à l’échelle macro- et microscopique.
Finalement, cette étude a montré que malgré une déformation endogène plus élevée, les bétons formulés à base de ciment au laitier de haut-fourneau fissurent après le béton formulé à base de ciment Portland. Ce comportement est dû à :
-l’impact du laitier sur la réaction d’hydratation du matériau cimentaire ;
-la présence d’une expansion de la matrice cimentaire des bétons formulés à base de ciment au laitier de haut-fourneau au jeune âge qui retarde l’apparition des contraintes de traction au sein du matériau ;
-la plus grande capacité de ces matériaux cimentaires à relaxer les contraintes de traction/
Today, the use of concretes with mineral additions (fly ash, slag) for civil engineering structures is spreading worldwide. Indeed, the production of blended cements is more respectful of the environment than the production of Portland cement, because it allows reducing greenhouse gas emissions and using industrial wastes. Slag cement concretes are also largely used for their good resistance to alkali-silica reactions, sulphate attacks and chloride diffusion. However, some of constructions built with slag cement concretes have exhibited cracking at early age due to their restrained deformations, such as thermal, autogenous and drying shrinkage. Following these observations, a preliminary experimental study was realized in the laboratory of BATir Department at ULB. It revealed several characteristics of the behaviour of slag cement concretes:
1. The study of restrained deformations under drying conditions by means of ring tests showed that the slag cement concretes seem more prone to crack than the Portland cement concretes;
2. The total free shrinkage for slag cement concrete is clearly larger than for Portland cement concrete. This difference of behaviour is mainly due to the fast and large increase in the autogenous deformation of the slag cement concrete.
Following these experimental results, the effect of the autogenous deformation on the cracking sensibility of slag cement concretes seemed interesting to investigate. Their deformations (autogenous deformation, compressive and tensile basic creep) have been studied at early age for three concretes characterized by different slag contents (0, 42 and 71%) under free and restrained conditions. For monitoring free and restrained autogenous deformations, several test rigs aimed at limiting artefacts were designed, like the TSTM (Temperature Stress Testing Machine). Moreover, the behaviour of these concretes was also characterized by a study at a macro- and microstructure scale.
Finally, this study shows that the slag cement concretes under sealed and fully restrained conditions crack later than the Portland cement concrete, despite the fact that they are characterized by the largest autogenous deformation. This behaviour is due to:
- the slag effect on the hydration reaction of cementitious material;
- the cement matrix expansion of the slag cement concretes at early age which delays the occurrence of tensile stresses inside the material;
- the largest capacity of this concrete to relax tensile stresses.
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
Thyagarajan, Ganesh. "Three-dimensional finite element modeling of total hip arthroplasty--creep under dynamic load." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1934.
Full textTitle from document title page. Document formatted into pages; contains ix, 80 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 75-80).
Milne, Josephine, and mikewood@deakin edu au. "Studies of the biology of four species of Dicranoloma." Deakin University, 1997. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050902.113817.
Full textBarker, D. S. "A numerical analysis of the effect of surface finish and cement creep in cemented total hip replacement." Thesis, 1996. http://hdl.handle.net/2440/120735.
Full textCabangon, Rico Jariel. "Physical and flexural creep properties of wood-wool cement boards." Phd thesis, 2003. http://hdl.handle.net/1885/148685.
Full textQIAN, SHENG-WEN, and 錢勝文. "A study of viscosity and creep properties of solidified bentonite-cement mixtures." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/11187697731683370634.
Full textHarinadha, Reddy D. "Time Dependent Deformations and High Temperature Effects on Different Types of Concrete : Experimental and Numerical Studies." Thesis, 2016. http://hdl.handle.net/2005/3207.
Full textYu, Jin-Yi, and 游瑾宜. "Study on the creep test of cemented sand." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5080032%22.&searchmode=basic.
Full text國立中興大學
水土保持學系所
107
Using triaxial tests, before the failure of specimens, the deviator stress was fixed and the cyclic mean stress was applied to study the influence of creep on cemented sand. Compared with the natural geological materials with anisotropy, cemented sand is a synthetic material with homogeneous and uniform advantages, so the error caused by the test is small. Due to the material composition, cemented sand has the property of being weakened by water, so the pore water pressure is not added during the test. It has been found through experiments that the creep test with the cyclic mean stress has a shorter duration than the conventional creep test with only fixed deviator stress, and the volumetric strain of the two creep test is similar. Therefore, in order to shorten the time of observing the material''s creep behavior, a creep test method with a fixed deviator stress and cyclic mean stress is selected for research. The test results show that the axial strain accumulation, the axial strain rate, and the strength after creep of cemented sand, both are positively correlated with the creep initial mean stress, under the same creep time and creep initial stress ratio. The test results also show that the axial strain accumulation and the axial strain rate of cemented sand are positively correlated with the creep initial stress ratio, and the strength after creep of cemented sand is negatively correlated with the creep initial stress ratio, under the same creep time and creep initial mean stress. Under the same creep initial stress ratio, cemented sand with the same amplitude and period for triaxial creep test. According to the test results, the number of cycles to failure, the axial strain accumulation and the axial strain rate in the creep second stage of cemented sand are positively correlated with the creep initial mean stress. In this study, cemented sand was used to conduct the creep test. After testing, it was found that the volumetric strain case of the cyclic mean stress creep test is similar to the conventional creep test with only fixed deviator stress and is relatively short. Therefore, the cyclic creep test may be used to replace the traditional creep test to shorten the time for studying the material''s creep behavior. Although the creep behavior discussed in this study is not quite comprehensive due to the limitations of measuring instruments., it may be a possibility to replace the traditional creep test with a cyclic creep test. In addition, it is also observed that the creep initial stress ratio, and the creep initial mean stress both have an effect on the creep behavior of the cemented sand.