Influence of aggregates grading and water/cement ratio in workability and hardened properties of mortars

Haach, Vladimir Guilherme; Vasconcelos, Graça; Lourenço, Paulo B.

doi:10.1016/j.conbuildmat.2010.11.011

Cited by 224 publications

(89 citation statements)

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“…The WA allows the coalescence of foam bubbles inside the mortar, and consequently, an increase in the size of the bubbles and air content, which lessens density and CS. Results are in agreement with former studies by Nambiar and Ramamurthy [50] and Haach et al [49].…”

Section: Compressive Strength-cssupporting

confidence: 83%

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Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

et al. 2017

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Featured Application: The use of construction and demolition waste (CDW) in the development of building materials has been done constantly. The CDW from Passo Fundo region of Rio Grande do Sul/Brazil can be used in development of foamed concrete fully replacing the natural sand. Abstract:The main objective of this study was to evaluate the use of construction and demolition waste (CDW) from the Passo Fundo region of Rio Grande do Sul (RS), Brazil, in the development of aerated foamed concrete. This waste had not yet been characterized or even reused. CDW was processed (sieved only), characterized, and used as an aggregate, completely substituting natural sand. The influence of CDW granulometry and the amount of foam upon compressive strength, wet and dry bulk density, water absorption, and the air voids of concrete blocks were determined. Results showed that CDW has regular characteristics for the development of aerated foamed concrete. Compressive strength and density decreased as the amount of foam increased, while water absorption and air voids also increased. Also, CDW that was classified as coarse showed higher compressive strength. On average, CDW medium-sized particles had a higher air void content, while water absorption showed little variation with respect to granulometry. CDW residue from the region of study can be used as aggregate for the development of aerated foamed concrete. However, it must characterized before being used to guarantee the quality of the final product.

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Section: Compressive Strength-cssupporting

confidence: 83%

“…This shows that CDW granulometry has a significant influence upon CS by a contribution of 15%. Studies performed by Haach et al [49] also found a small influence of granulometry on CS; however, natural sand was used as aggregate. FS also significantly influenced CS by a contribution of 71%.…”

Section: Compressive Strength-csmentioning

confidence: 99%

Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

et al. 2017

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“…Many scholars have conducted several research works on the effects of different parameters including water to cement (W/C) ratio, sand to cement (S/C) ratio and aggregate type S/Con the compressive strength and related factors such as porosity, workability and durability of mortar [14][15][16][17][18][19][20]. As instance, Singah et al studied the effect of W/C ratio on mechanical properties of cement mortar such as compressive and tensile strengths [14].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of different types of aggregates on the compressive strength of mortar was studied by Bumanis et al [16]. Snuck et al investigated the effect of W/C ratio and aggregate grade on the workability and hardened properties of mortar [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Main Factors on Fracture Mode of Mortar, A Graphical Study

2017

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One of the most effective ways to identify the concrete properties is to understand further about the cement mortar, which is a mixture of cement paste and fine aggregate. In order to identify the behavior of cement mortar, all required materials including cement, fine aggregate, water as well as the different ratios of each material should beinvestigated. The main objective of this research is to study the effectiveness of main parameters of mortar on the fracture mode and related factors. Specifically 26 mixing designs of flexural mortar with three cement strength classes (32.5, 42.5 and 52.5 MPa), three water to cement (W/C) ratios (0.25, 0.3 and 0.35) and three sand to cement (S/C) ratios (2.5, 2.75 and 3) were first prepared. The prepared samples were then tested using a stress-strain apparatus. Some pictures were finally taken from the fracture surfaces to investigate the mode and angle of fractures. The results indicated that any change in the main parameters of mortar changes the fracture mode and the fracture angle.

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“…Cuando esto sucede, las probetas quedan completamente rellenas y la masa de mortero se distribuye con facilidad ocupando todo el molde evitando espacios internos, a priori esto es ventajoso, pero si el escurrimiento es excesivo puede debilitar en exceso la muestra obteniendo consecuencias contraproducentes [20].…”

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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Influence of aggregates grading and water/cement ratio in workability and hardened properties of mortars

Cited by 224 publications

References 18 publications

Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

Characterization and Use of Construction and Demolition Waste from South of Brazil in the Production of Foamed Concrete Blocks

Effect of Main Factors on Fracture Mode of Mortar, A Graphical Study

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

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