Reaction mechanisms of concrete admixtures

Paulini, P.

doi:10.1016/0008-8846(90)90053-z

Cited by 37 publications

(14 citation statements)

References 3 publications

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“…6. Alite hydration (Paulini, 1990) The ability of ettringite, Ca 2+ , and pressure lead to concrete expansion, while product hydration growth makes shrinkage because product hydration volume is less than its ingredients (Fig. 6).…”

Section: Discussionmentioning

confidence: 99%

Early–Age Shrinkage of High-Performance Concrete Beam in Laboratory and Full-Scale

2019

CER

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The beam is a significant element structure in bridge and high-rise building. The aim of this study is to obtain the difference of early age shrinkage between beam with laboratory scale and full scale. High-performance concrete with compressive strength of 60 MPa was used. This research was done experimentally in Indonesia for 24 hours. Three pieces of specimens measuring laboratory size of 150 mm × 150 mm × 600 mm, and one specimen measuring 200 mm ×600 mm ×3000 mm as full-scale specimen were used. All specimens were covered with styrofoam to eliminate transfer humidity. Early age shrinkage was obtained by using an embedded vibrating wire strain gauge for each laboratory size specimen and four embedded vibrating wire strain gauge for the full-scale specimen. As a result, the shrinkage type of full-scale specimen is a similar type to laboratory size. Shrinkage in laboratory size specimen is 31.5% larger than in full-scale specimen. Maximum shrinkage in a fullscale specimen is about 0.8E-04 occurs at the concrete age of 15.8 hours, while in laboratory size specimen is about 1.255E-04 occur at the age of 22.2 hours. Fluctuation expansion and shrinkage are smoother in full-scale than in laboratory size specimen. This is because in full-scale ettringite can expand more optimally so that it can come with stand shrinkage losses due to the growth of hydration products. High rate deformation of both specimens scale is occurring in the age range of 5-9 hours. Therefore, it is safe to assume the behavior of a real beam of high-performance concrete similar to laboratory size beam.

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Section: Discussionmentioning

confidence: 99%

Early–Age Shrinkage of High-Performance Concrete Beam in Laboratory and Full-Scale

2019

CER

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“…Knudsen y Geiker (1985) y Paulini (1990). Esta técnica es más fácil de automatizar, pero también es más cara, debido a que se necesita una balanza de alta precisión para cada pasta a ser ensayada (LURA; WINNEFELD; KLEMM, 2010).…”

Section: Método De Gravimetríaunclassified

Métodos de determinación de la cinética de hidratación mediante la retracción química y parámetros que lo influencian

2017

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CACERES, D. P. E.; JOHN, V. J.; CINCOTTO, M. A. Métodos de determinación de la cinética de hidratación mediante la retracción química y parámetros que lo influencian. Ambiente Construído, Porto Alegre, v. 17, n. 4, p. 109-124, out./dez. 2017 Resumen edir la retracción química proporciona información sobre el desarrollo de la cinética de hidratación de materiales cementicios; además está relacionada con el grado y calor de hidratación. Para determinar la retracción química, se cuantifica la variación de volumen debido a las reacciones de hidratación en una muestra de pasta de cemento en condiciones de saturación. En general existen tres formas para medir esta retracción: dilatometría, gravimetría y picnometría. Estos procedimientos experimentales requieren equipos sencillos y de bajo costo. Existen parámetros que pueden influenciar en los resultados, tales como: espesor de la muestra, relación agua/cemento, área superficial de la muestra, cantidad de agua sobre la muestra y composición del cemento. En este trabajo se detallan los métodos para determinar la retracción química en pastas de cemento Portland, así como los parámetros que influencian en los resultados.

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“…-use of retarders (Paulini 1990) -a greater quantity of retarder causes greater initial expansion, -a greater quantity of C 2 S (belite) that causes an increase in volume (JCI 1998), -bleed water re-absorption that happens in the period immediately prior to and at the start of the setting process (Hammer 1998;Holt 2001).…”

Section: Autogenous Expansion Of Concretementioning

confidence: 99%

Autogenous Shrinkage and Expansion Related to Compressive Strength and Concrete Composition

Marušić

Štirmer

2016

ACT

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An extensive research was undertaken in order to determine the dependence of shrinkage of high and normal strength concrete on the compressive strength and concrete composition. The part of research concerning dependence of autogenous shrinkage on compressive strength is presented in this paper. Ten groups of concrete, with the total of twenty nine mixtures, were prepared. Concrete mixtures of each individual group were made using the same quantity of water, while the quantity of cement (CEM II/A-S 42,5R) and mineral admixture (silica fume) was varied in each group. Concrete groups differed according to the quantity of water. Autogenous shrinkage of concrete was monitored together with the influence of initial curing in water on concrete shrinkage. Initial autogenous expansion was noticed during testing autogenous shrinkage, especially on normal strength concrete. Based on the analysis of experimental results, the dependence of autogenous shrinkage at one day of concrete age on compressive strength was defined. The dependence of autogenous shrinkage at later ages on compressive strength of concrete was also presented. Finally, the autogenous shrinkage components of best-known theoretical shrinkage prediction models were compared with experimental data.

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Reaction mechanisms of concrete admixtures

Cited by 37 publications

References 3 publications

Early–Age Shrinkage of High-Performance Concrete Beam in Laboratory and Full-Scale

Early–Age Shrinkage of High-Performance Concrete Beam in Laboratory and Full-Scale

Métodos de determinación de la cinética de hidratación mediante la retracción química y parámetros que lo influencian

Autogenous Shrinkage and Expansion Related to Compressive Strength and Concrete Composition

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