Field validation of models for predicting lateral form pressure exerted by SCC

Billberg, Peter; Roussel, Nicolas; Amziane, Sofiane; Beitzel, Marc; Charitou, George; Freund, B. J.; Gardner, John W.; Grampeix, Guillaume; Graubner, C.-A.; Keller, Lloyd; Khayat, Kamal H.; Lange, David A.; Omran, Ahmed; Perrot, Arnaud; Proske, Tilo; Quattrociocchi, Robert; Vanhove, Yannick

doi:10.1016/j.cemconcomp.2014.02.003

Cited by 56 publications

(23 citation statements)

References 8 publications

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“…It has been shown that the structural build-up properties of cement-based materials can be used to predict or optimize concrete production. For instance, formwork pressure reduction or distinct-layer casting issues can be predicted using the structural build-up rate of self-compacting concrete [21][22][23][24]. In the present case, structural build-up is used to describe and model the competition between the load increase, linked to the building rate, and the mechanical strength of the first deposited layer of the structure which is linked to the cement-based material yield stress.…”

Section: Introductionmentioning

confidence: 99%

Structural built-up of cement-based materials used for 3D-printing extrusion techniques

2015

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Additive manufacturing and digital fabrication bring new horizons to concrete and cementbased material construction. 3D printing inspired construction techniques that have recently been developed at laboratory scale for cement-based materials. This study aims to investigate the role of the structural build-up properties of cement-based materials in such a layer by layer construction technique. As construction progresses, the cement-based materials become harder with time. The mechanical strength of the cement-based materials must be sufficient to sustain the weight of the layers subsequently deposited. It follows that the comparison of the mechanical strength, which evolves with time (i.e. structural buildup), with the loading due to layers subsequently deposited, can be expected to provide the optimal rate of layer by layer construction. A theoretical framework has been developed to propose a method of optimization of the building rate, which is experimentally validated in a layer-wise built column.

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Section: Introductionmentioning

confidence: 99%

Structural built-up of cement-based materials used for 3D-printing extrusion techniques

2015

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“…Billberg et al [43] made an evaluation of existing models for predicting the maximum lateral pressure exerted by SCC on vertical formworks. Eight different walls with different sections were tested at different casting rates.…”

Section: Scc Poured From the Topmentioning

confidence: 99%

“…The experimental data for SCC poured from the top of the formwork were those supplied by CEBTP [29], Proske and Graubner [24], Leemann and Hoffmann [30], Khayat et al [13] Assaad et al [31], Khayat and Assaad [32,33], Khayat [34], Billberg et al [10], Tejeda-Dominguez et al [35], Assaad and Khayat [36][37][38][39], Leemann et al [28], Giammatteo et al [40], Kwon et al [12], Beitzel [41], McCarthy et al [42], Gardner et al [27] and Billberg et al [43].…”

Section: Scc Poured From the Topmentioning

confidence: 99%

Analysis of casting rate for the validation of models developed to predict the maximum lateral pressure exerted by self-compacting concrete on vertical formwork

Teixeira

Santilli

Puente

2016

Journal of Building Engineering

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“…Maranhão [4] presented, in his report, the results of the studies carried out by the Laboratório de Madeiras e Estruturas de Madeiras (LaMEM -Wood and Wood Structures Laboratory), from the Structural Engineering Department from the School of Engineering of São Carlos -USP (University of São Paulo, Brazil), which indicate the placement rate and concrete consistency as the parameters that have most influenced the fresh concrete lateral pressure value. Differently, Billberg et al [11], based on the fresh concrete lateral pressure gauged through field research, concluded that in the case of the self-consolidating concrete, other causes may be more relevant than the placement rate, due to the low correlation between this parameter and the maximum relative lateral pressure (predicted rate between the measured pressure and hydrostatic pressure). The lack of correlation between the pressure and the placement rate displays that the self-consolidating concrete structural behavior at rest must be considered in the prediction of the lateral pressure on the formworks.…”

Section: Figurementioning

confidence: 99%

“…With the time of filling associated with the height of the column it was calculated the placement rate. On the measurement of the layers, it was performed the methodology established by Billberg et al [11], where it was used a measuring tape and a timer. Thus, it was verified, for each concrete layer placing inside the columns formworks, the depth of the surface with no concrete and the elapsed time until the concrete reached that specific level.…”

Section: Measurements Of the Placement Rate On The Fieldmentioning

confidence: 99%

Influence of the placement rate on the fresh concrete lateral pressure in the design of formworks

Sousa

Santos

Pereira

et al. 2018

Rev. IBRACON Estrut. Mater.

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ResumoThe fresh concrete lateral pressure generates a load that has great influence in the design of the formworks of columns, walls and lateral faces of the beams.Its prediction must be performed in such a way in order to approach precisely well over the rate values supported by the formworks, avoiding, therefore, the oversizing or undersizing of these temporary structures which represent up to 12% of the total cost of the construction. The calculation of the lateral pressure that fresh concrete exerts on the formworks involves several variables; one of them is the placement rate. The main objective of this work was to study the influence of the placement rate, in situ, on the lateral pressure of fresh concrete calculated from theoretical models presented by norms and international references. For this purpose, measurements of the placement rate were conducted on columns of five building work places at Goiânia city, Goiás, Brazil and it was calculated the maximum pressure supported by their respective formworks from the dimensions and spans between the supports of the components that constituted them. The obtained results indicate that the placement rate in the field observations reach 249 m/h, exceeding the values limited by the theoretical methods of calculation, and that the lateral pressure estimation produced from the placement rate measured in situ exceed the maximum values supported by the formworks up to 604 times. Thus, it was concluded that it is necessary to adjust equations to estimate the lateral pressure of fresh concrete at high rate of concrete placement, according to the current practices in the construction market.Keywords: lateral pressure, formworks, columns, placement rate.A pressão lateral do concreto fresco gera uma carga que possui grande influência no dimensionamento das fôrmas de pilares, paredes e faces laterais das vigas. Sua previsão deve ser realizada de modo que se aproxime bem dos valores suportados pelas fôrmas, evitando-se, assim, o superdimensionamento ou subdimensionamento dessas estruturas provisórias que representam até 12% do custo total da obra. O cálculo da pressão lateral que o concreto fresco exerce sobre as fôrmas envolve diversas variáveis, sendo uma delas a velocidade de concretagem. O principal objetivo deste trabalho foi estudar a influência da velocidade de concretagem sobre a pressão lateral do concreto fresco calculada a partir de modelos teóricos apresentados por normas e referências internacionais. Para isso, foram realizadas medições da velocidade de concretagem em pilares de cinco obras de Goiânia e calculadas as pressões máximas suportadas por suas respectivas fôrmas, a partir das dimensões e dos vãos entre os apoios dos elementos que as constituíam. Os resultados obtidos apontam que as velocidades de concretagem em campo chegam a 248,57 m/h, superando os valores limitados pelos métodos teóricos de cálculo, e que as estimativas da pressão realizadas a partir das velocidades medidas in loco ultrapassam os valores máximos suportados pelas fôrmas em ...

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Field validation of models for predicting lateral form pressure exerted by SCC

Cited by 56 publications

References 8 publications

Structural built-up of cement-based materials used for 3D-printing extrusion techniques

Structural built-up of cement-based materials used for 3D-printing extrusion techniques

Analysis of casting rate for the validation of models developed to predict the maximum lateral pressure exerted by self-compacting concrete on vertical formwork

Influence of the placement rate on the fresh concrete lateral pressure in the design of formworks

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