Restrained shrinkage behavior of expansive mortar at early ages

Choi, Hyeonggil; Lim, Myungkwan; Kitagaki, Ryoma; Noguchi, Takafumi; Kim, Gyu-Yong

doi:10.1016/j.conbuildmat.2015.03.075

Cited by 29 publications

(12 citation statements)

References 5 publications

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“…Currently, many investigators focus on revealing the mechanisms of cracking by several kinds of experiments and developing prediction models of crack development [12,[16][17][18]. e ring test is a commonly used method for assessing the potential of shrinkage cracking.…”

Section: Introductionmentioning

confidence: 99%

“…e ring test is a commonly used method for assessing the potential of shrinkage cracking. Moon and Weiss used the ring test to assess the restrained shrinkage behavior of mortar and concrete under various conditions [5,8,9,12,17,19]. ey proposed revisions to the estimation equations developed in previous studies to consider the changes in stress in the cross section because of di erential drying shrinkage.…”

Section: Introductionmentioning

confidence: 99%

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Influences of Environmental Conditions on the Cracking Tendency of Dry‐Mixed Plastering Mortar

Yang

et al. 2018

Advances in Materials Science and Engineering

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Cracking tendency is one of the important performances of dry-mixed plastering mortar (DMPM). Environmental condition is a key factor to affect the cracking tendency of DMPM. For the purpose of evaluating the cracking resistance of DMPM and revealing the influence of environmental conditions on the cracking tendency of DMPM, a series of experiments were performed on restriction-induced cracking behaviors as well as free shrinkage, water loss, and mechanical properties of DMPM. The restricted shrinkage tests were based on ring tests and plate experiments. The results showed that the initial drying age exhibits significant influence on the cracking tendency of DMPM, and there was a stress balance period when the initial drying age was 2 days. But, the phenomena cannot be observed when the initial age was 3 d, 5 d, and 7 d. In order to eliminate the cracking tendency of DMPM, it should avoid water loss from the plaster layer during construction in practical engineering, especially, before initial drying ages.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influences of Environmental Conditions on the Cracking Tendency of Dry‐Mixed Plastering Mortar

Yang

et al. 2018

Advances in Materials Science and Engineering

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“…With prolonged shrinkage action and the presence of hard obstacles to volume reduction, for example, reinforcement or aggregate, holding-down gears, high tensile stresses arise in the cement stone, which can lead to the formation of cracks and destruction of concrete [1,2]. Reduction in shrinkage is usually achieved by constructive methods: increase in the number of reinforcement, breakdown of structures into separate blocks, increasing the frequency of shrinkage joints and other ways [3]. As a rule, all these measures increase construction costs and can shorten the life of structures.…”

Section: Introductionmentioning

confidence: 99%

Electricity costs for grinding of cement with expanding additives

Самченко¹,

Zorin²

2018

IJET

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The most popular building material, including on transport facilities, is cement. Cement production is associated with the electricity costs. The biggest cost item is the consumption for the cement clinker grinding. It is known that disperse characteristics of cements, such as fineness of grinding, specific surface, coarseness of grading, largely determine their hydraulic properties, and for expanding cementsthe deformation ones. In the paper, the issues of electric power consumption were considered when grinding extender expanders: aluminous slag, sulfoaluminate, sulfoferrite and sulfoalumoferrite clinkers.

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“…18 donde es la constante de proporcionalidad elástica y es el desplazamiento respecto a la posición de equilibrio.…”

Section: Movimiento Oscilatorio O Vibratoriounclassified

“…Aunque la arena actúa como base sólida regulando los cambios de volumen y evitando los agrietamientos, esto solo es posible si el secado se produce de forma lenta y el mortero es capaz de alcanzar la suficiente resistencia a tracción como para soportar las tensiones internas generadas. Si por el contrario, el secado es muy virulento, la pérdida de agua es excesiva y se forman grietas apreciables, que dividen al mortero en formas más o menos poligonales [18].…”

Section: Ensayos Y Propiedades De Los Morteros Para Edificaciónunclassified

Estudio de la transmisión de vibraciones por impacto en losas de hormigón y mortero

Vega¹

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Tesis Doctoral: Estudio de la transmisión de vibraciones en losas de hormigón y mortero.Daniel Ferrández Vega pág. 5 RESUMENEn la actualidad existe una amplia variedad de sistemas y materiales que se emplean como atenuadores del ruido de impacto y evitan la transmisión de vibraciones en los edificios. Muchos de estos sistemas empleados en construcción, se caracterizan por desolidarizar la capa de compresión del forjado de la estructura, cumpliendo con la condición de ser materiales elásticos.Para la realización de los ensayos acústicos que permiten validar un determinado material o sistema constructivo como atenuador de este tipo de ruidos, es necesario realizar una prueba poco económica y de difícil ejecución tal y como marca la actual norma UNE-EN ISO 140. En primer lugar se necesita elaborar un forjado de referencia, que ha de ensayarse independientemente. Después, se ha de colocar la losa flotante y volver a realizar la prueba, siendo la diferencia entre las medidas realizadas la que determina la reducción al ruido de impacto.En este trabajo se presenta un sistema capaz de detectar las vibraciones y mesurarlas más sencillo y económico, consistente en un dispositivo de golpeo alternativo y un sensor capaz de recoger, una vez producido el impacto, la energía absorbida por la placa. Producido el impacto, la baldosa sufre una deformación que absorbe parte de la energía, siendo la restante transmitida a través del material y, a su vez, causante del ruido aéreo inducido en la estancia colindante. La placa absorbe su energía a través de su propia deformación, la cual se mide con ayuda del sensor capacitivo.Es por ello que para realizar este estudio de la transmisión de vibraciones y evaluar los distintos modos de transmisión a través de las estructuras, se elaboraron planchas de diferentes geometrías y dos materiales distintos, hormigón y mortero, así como, también se varió la geometría de los aislantes y su tipología, poliestireno expandido con y sin elastificar. Además, se tomaron medidas en una losa de grandes dimensiones, que puede servir como premisa para elaborar un nuevo sistema alternativo de medida del aislamiento acústico a ruido de impacto.Palabras Clave: Vibración, ruido de impacto, sensor capacitivo, hormigón, mortero, poliestireno expandido.Tesis Doctoral: Estudio de la transmisión de vibraciones en losas de hormigón y mortero.Daniel Ferrández Vega pág. 6 ABSTRACTCurrently there is a large variety of systems and materials used as impact noise attenuators and prevent the transmission of vibrations in buildings. Many of these systems used in construction are characterized by separate the compression layer of the floor of the structure, provided the condition of being elastic materials.For conducting acoustic tests which validate a particular material or construction system as attenuator such noises, it is necessary to perform an uneconomical and difficult to execute test, such evidence as marks the current UNE-EN ISO 140. First place needs to develop a forged reference to be tested independently. Then, ...

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Restrained shrinkage behavior of expansive mortar at early ages

Cited by 29 publications

References 5 publications

Influences of Environmental Conditions on the Cracking Tendency of Dry‐Mixed Plastering Mortar

Influences of Environmental Conditions on the Cracking Tendency of Dry‐Mixed Plastering Mortar

Electricity costs for grinding of cement with expanding additives

Estudio de la transmisión de vibraciones por impacto en losas de hormigón y mortero

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