Autogenous deformation and RH-change in perspective

Jensen, Ole Mejlhede; Hansen, Poul Henrik Kyvsgaard

doi:10.1016/s0008-8846(01)00501-4

Cited by 292 publications

(138 citation statements)

References 9 publications

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“…The water-cement ratio in the concrete mix, due to its workability, usually is W/C = 0.3÷0.5. However, for cement complete hydration only W/C theor hydr = 0.20÷0.25 is sufficient, but complete hydration generally never happens and then W/C real hydr = 0.12÷0.15 [2]. This indicates that the excess of water from the concrete mix must evaporate, the value increasing with higher W/C, i.e.…”

Section: Unrestrained Shrinkage Of Concrete ε Cs (T)mentioning

confidence: 99%

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The influence of concrete shrinkage on durability of reinforced structural members

Flaga¹

2015

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The aim of the paper was to present the author's novel approach to the problem of the influence of concrete shrinkage on the static-strength performance of reinforced structures. The problem of concrete shrinkage has been known in concrete technology for years, mainly in the theoretical and experimental aspects. However, there are few works in which the effect of concrete shrinkage in real reinforced structural members and structures is shown. In the present article the author performs an analysis of these effects on a macro-scale, useful in the assessment of the influence of concrete shrinkage on limit states of bearing capacity and serviceability of reinforced concrete structures. An important distinction is made between shrinkage stresses imposed in RC members by external and internal (reinforcement induced) constraints and residual shrinkage stresses inside members (massive especially) resulting from non-stationary and non-linear moisture fields. The article concludes with a way of calculating the necessary, near-surface anti-shrinkage reinforcement in such members.Key words: unrestrained shrinkage of concrete, calculation of shrinkage in reinforced concrete, internal forces and shrinkage stresses in a structure imposed by external and internal constraints, residual shrinkage stresses, massive elements.

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Section: Unrestrained Shrinkage Of Concrete ε Cs (T)mentioning

confidence: 99%

“…There are many research works worldwide on the problems of concrete shrinkage, its causes, development in time, thermal, moisture and geometry conditions [1][2][3][4]. Fewer works, although also numerous, have been devoted to the problem of the influence of concrete shrinkage on reinforced members and structures [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The influence of concrete shrinkage on durability of reinforced structural members

Flaga¹

2015

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…The loss of water with time increases the concrete shrinkage. Autogenous type of shrinkage is also studied in concrete [3]. The studies showed the uncontrolled shrinkage leads to concrete cracking.…”

Section: Introductionmentioning

confidence: 99%

Self-sealing concrete mortar, concrete mortar mixed with super absorbent polymer

Al-Nasra

2017

MATEC Web Conf.

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Abstract.Researchers tried almost every conceivable material to be mixed in concrete to alter some of its properties. In this research superabsorbent polymer is used as an admixture to improve its water tightness properties especially in concrete tanks, aeration basins, and retaining structures. The concrete tries to seal the leak by blocking the water path by semi-solid gels. This gel is the product of the interaction of the superabsorbent polymer with water. Several samples have been prepared to study the effect of the superabsorbent polymer on the concrete strength, and on the concrete capability to block the water flow. Concrete cubes, concrete beams, and concrete tension samples were prepared to study the concrete strength of concrete mixed with superabsorbent polymer. Also concrete short cylindrical samples were prepared to study the concrete ability to block the water flow. These cylindrical samples were intentionally broken into two approximately equal pieces to create an induced crack. The artificially cracked samples are then subjected to water pressure to study the concrete ability to stop the water flow though the induced concrete crack. Two kinds of water pressure are used in this research; the constant head, and the falling head.

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“…Cuando no se produce el curado interno, el HAR puede sufrir en edades tempranas deformaciones y microfisuras importantes por todo el sistema (3). La densa microestructura del hormigón moderno produce rápidamente discontinuidad capilar en la red porosa inicial y, en consecuencia, impide el acceso del agua exterior al interior y con ello la saturación del volumen total (4).…”

Section: Introductionunclassified

“…En el primer caso, los agentes de curado pueden ser áridos ligeros (AL) o polímeros superabsorbentes (PSA) (5). Los resultados obtenidos con los PSA han demostrado que contribuyen a reducir los problemas de calidad del hormigón (3,(5)(6)(7). Sin embargo, su introducción en la matriz del cemento conlleva también una menor resistencia (8).…”

Section: Introductionunclassified

Efecto de las condiciones de curado en las propiedades mecánicas de los morteros con partículas superabsorbentes

Esteves¹,

Paiva²,

Ferreira³

et al. 2010

Mater. construcc.

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RESUMENEste artículo presenta el efecto de las condiciones de curado sobre las propiedades mecánicas de los morteros a los que se han añadido polímeros superabsorbentes como agentes de curado interno. Los morteros se curaron a dos temperaturas, 20 y 40 °C, y a varios valores de la humedad relativa entre el 30 y el 95%. Se estudió asimismo dicho efecto en función de la relación agua/cemento. Se realizaron pruebas de resistencia a la compresión y a la tracción a distintas edades. Los resultados incluyen la evolución de la pérdida de masa y su relación tanto con las condiciones ambientales como con el comportamiento resistente de los morteros. El curado interno de éstos con polímeros superabsorbentes permitió el mantenimiento de sus propiedades mecánicas en condiciones de curado extremas.Palabras clave: polímeros superabsorbentes, morteros, curado, propiedades mecánicas. SUMMARYThis paper describes the effect of curing conditions on the mechanical properties of mortars containing superabsorbent polymers (SAP). Curing temperature and relative humidity were varied from 20 to 40 ºC and 30 to 95%, respectively, in mixes with different water/cement and cement/aggregate ratios. Tensile and compressive strength tests were performed at several ages. Weight loss over time was measured and related to curing conditions and strength. The addition of SAPs was found to effectively maintain cement-based mortar strength under extreme curing conditions. K Ke ey yw wo or rd ds s: : superabsorbent polymers, mortars, curing, mechanical properties.(

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Autogenous deformation and RH-change in perspective

Cited by 292 publications

References 9 publications

The influence of concrete shrinkage on durability of reinforced structural members

The influence of concrete shrinkage on durability of reinforced structural members

Self-sealing concrete mortar, concrete mortar mixed with super absorbent polymer

Efecto de las condiciones de curado en las propiedades mecánicas de los morteros con partículas superabsorbentes

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