Autogenous shrinkage in high-performance cement paste: An evaluation of basic mechanisms

Lura, Pietro; Jensen, Ole Mejlhede; Breugel, K. van

doi:10.1016/s0008-8846(02)00890-6

Cited by 548 publications

(290 citation statements)

References 10 publications

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“…All hydrogel compositions displayed a short peak swelling followed by significant deswelling at 0.005 M (Figure 4a). Similar behavior is seen at 0.025 M (Figure 4b), although the changes in swelling capacities of all hydrogels were much lower, ranging of about 5 gfluid/ghydrogel rather than (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) gfluid/ghydrogel as observed in the 0.005 M concentration solutions. At 0.1 M, virtually no swelling was observed in any hydrogels, again suggesting that at high concentrations of aluminum, the cations are strongly associating with the outermost portions of the hydrogel and may be forming a dense layer through which the solvent cannot diffuse during the timescales of observation.…”

Section: Hydrogel Swelling Behavior In Aluminum Sulfate Solutionssupporting

confidence: 75%

“…Water is consumed by the Portland cement to form calcium-silicate-hydrate (CSH), which is the inorganic binder from which the compressive strength of concrete is derived [8,9]. In HPC mixes, significant inward Laplace pressures will develop as the water is consumed and drained from the smallest pores within the hydrated cement network [10]. These pressures are high enough to cause a bulk volumetric collapse of the system referred to as autogenous shrinkage, which can result in early-age cracking and structural failure, especially if the concrete is restrained against forms, reinforcements, or other concrete [11].…”

Section: Introductionmentioning

confidence: 99%

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Improved Concrete Materials with Hydrogel-Based Internal Curing Agents

Krafcik

Macke

Erk

2017

Gels

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This research article will describe the design and use of polyelectrolyte hydrogel particles as internal curing agents in concrete and present new results on relevant hydrogel-ion interactions. When incorporated into concrete, hydrogel particles release their stored water to fuel the curing reaction, resulting in reduced volumetric shrinkage and cracking and thus increasing concrete service life. The hydrogel's swelling performance and mechanical properties are strongly sensitive to multivalent cations that are naturally present in concrete mixtures, including calcium and aluminum. Model poly(acrylic acid(AA)-acrylamide(AM))-based hydrogel particles with different chemical compositions (AA:AM monomer ratio) were synthesized and immersed in sodium, calcium, and aluminum salt solutions. The presence of multivalent cations resulted in decreased swelling capacity and altered swelling kinetics to the point where some hydrogel compositions displayed rapid deswelling behavior and the formation of a mechanically stiff shell. Interestingly, when incorporated into mortar, hydrogel particles reduced mixture shrinkage while encouraging the formation of specific inorganic phases (calcium hydroxide and calcium silicate hydrate) within the void space previously occupied by the swollen particle.

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Section: Hydrogel Swelling Behavior In Aluminum Sulfate Solutionssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Improved Concrete Materials with Hydrogel-Based Internal Curing Agents

Krafcik

Macke

Erk

2017

Gels

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“…Due to hydration, pore water is consumed and after the plastic state the pore structure is partly empty, known as self-desiccation which creates a capillary force and an under-pressure in the pore water. The pressure is transferred to the solid and results in external contraction of the cement-based material, called autogenous or bulk shrinkage (Lura et al, 2003). Table 4 and 6.…”

Section: Reduction Of Shrinkagementioning

confidence: 99%

Cement sheath modification using nanomaterials for long-term zonal isolation of oil wells: Review

Jafariesfad

Geiker

Gong

et al. 2017

Journal of Petroleum Science and Engineering

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Well cementing is an important operation during drilling and completion of oil wells. The cement sheath must maintain well integrity behind the casing and provide long-term zonal isolation to ensure safety and prevent environmental problems. Despite recent technological advancement in smart polymeric materials, fibers and self-healing materials, it is still a big challenge to provide adequate long-term zonal isolation in severe oil well conditions. This review provides an overview of challenges faced in oil wells compromising the long-term ability of the cement sheath to provide zonal isolation. Factors controlling the long-term performance of cement sheath are discussed, in terms of shrinkage, tensile strength and flexibility. The use of nanomaterials as cement additive to fabricate flexible, high-tensile strength, and low-shrinkage cement system are reviewed.Introduction of nanomaterials into the cement system is a promising approach to design a sealant for the entire life of the well, thereby avoiding potential remedial costs and environmental impacts.

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“…It was concluded that the performance of cement paste and concrete is highly related to the pore volume and pore size distribution. Generally, large capillaries (larger than 100 nm) affect the strength and permeability of concrete [13,14] while small capillaries (less than 100 nm) influence the shrinkage and creep behavior of concrete [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Exploring Polymer-Modified Concrete and Cementitious Coating with High-Durability for Roadside Structures in Xinjiang, China

Guo

Sun²

2017

Advances in Materials Science and Engineering

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The concrete roadside structures in Xinjiang, China, such as roadside barriers, bridge rails, and drainage holes, are severely damaged by the coupled effect of seasonal freeze-thaw cycles and deicer salts. To solve the corrosion problems of roadside structures, polymermodified concrete was recommended for the future construction of roadside structures and polymer-modified cementitious coating was suggested for the protection of the current corroded ones. In this study, air-entraining agent and carboxylated styrene-butadiene latex were added for concrete modification and the corresponding performance tests were conducted. In addition, the performances of six types of readily available coating materials, including the acrylic latex modified cementitious coating designed in this study, were tested in freeze-thaw condition with the presence of chloride ions. The results show that 0.013% of the air-entraining agent and 10% of the carboxylated styrene-butadiene latex were appropriate dosage rates for the modification of Portland cement concrete, in terms of the improvement of the freeze-thaw resistance, compressive strength, and chloride impermeability. For the protection of the current corroded roadside structures, the acrylic-modified cementitious coating material demonstrated a good performance and the field monitoring confirmed that the coating is suitable for the protection of the roadside structures in Xinjiang.

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Autogenous shrinkage in high-performance cement paste: An evaluation of basic mechanisms

Cited by 548 publications

References 10 publications

Improved Concrete Materials with Hydrogel-Based Internal Curing Agents

Improved Concrete Materials with Hydrogel-Based Internal Curing Agents

Cement sheath modification using nanomaterials for long-term zonal isolation of oil wells: Review

Exploring Polymer-Modified Concrete and Cementitious Coating with High-Durability for Roadside Structures in Xinjiang, China

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