Formwork Pressure Model for Self-Consolidating Concrete Using a Pressure Decay Signature

Henschen, Jacob; Castaneda, Daniel I.; Lange, David A.

doi:10.14359/51702183

Cited by 8 publications

(11 citation statements)

References 11 publications

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“…Referring to the current state of the knowledge [ 40 , 42 , 45 , 46 , 47 , 48 , 49 ], the characteristic features of formwork pressure of radiation-shielding SCC seem to be similar to those of SCC with common rock aggregates. Therefore, it is reasonable to assume that the formwork pressure models presented in [ 12 ] could be applicable for the lateral pressure prediction of SCC with a special heavyweight or hydrous aggregate.…”

Section: Discussion Of the Resultsmentioning

confidence: 94%

Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix

2021

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High-fluidity and self-compacting concrete (SCC) mixes were developed using special aggregates for radiation-shielding concrete. The special aggregates comprised heavyweight and hydrous aggregates (crushed magnetite, crushed serpentine, and their mixtures), which were selected to provide an enhanced attenuation of gamma and neutron radiation, respectively. For the mixed concrete design with a bulk density of up to 3570 kg/m3, two cement types were used: Portland cement CEM I and slag cement CEM III/A. The basic properties of the fresh self-compacting concrete were evaluated and the lateral formwork pressure exerted by the freshly mixed self-compacting concrete was measured and analyzed. An original test setup was developed for the determination of the lateral pressure on the square column formwork with pressure measurements carried out using six strain gauge pressure transducers, which was adequate for heavyweight concrete mixture testing. Self-compacting concrete mixtures containing a magnetite aggregate or blends of serpentine and magnetite aggregates with a slump flow of at least 550 mm were developed. The lateral pressure on the formwork was directly proportional to the density of the self-compacting heavyweight concrete mixes. The maximum values of the lateral pressure recorded in the test at a casting speed of 1.5 m/h did not exceed 27 kPa and 55% of hydrostatic pressure. Concrete mixtures with basalt, magnetite, and magnetite/serpentine blended aggregates were found to develop sufficient shear strength for proper stability during casting.

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Section: Discussion Of the Resultsmentioning

confidence: 94%

Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix

2021

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“…Another important factor that has an impact on the formwork pressure is reinforcement, i.e., its orientation and dimensions [ 54 , 71 ]. Congested reinforcement can reduce the pressure by taking over a part of the concrete load.…”

Section: Parameters Affecting the Lateral Formwork Pressurementioning

confidence: 99%

Lateral Formwork Pressure for Self-Compacting Concrete—A Review of Prediction Models and Monitoring Technologies

2021

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The maximum amount of lateral formwork pressure exerted by self-compacting concrete is essential to design a technically correct, cost-effective, safe, and robust formwork. A common practice of designing formwork is primarily based on using the hydrostatic pressure. However, several studies have proven that the maximum pressure is lower, thus potentially enabling a reduction in the cost of formwork by, for example, optimizing the casting rate. This article reviews the current knowledge regarding formwork pressure, parameters affecting the maximum pressure, prediction models, monitoring technologies and test setups. The currently used pressure predicting models require further improvement to consider several pressures influencing parameters, including parameters related to fresh and mature material properties, mix design and casting methods. This study found that the maximum pressure is significantly affected by the concretes’ structural build-up at rest, which depends on concrete rheology, temperature, hydration rate and setting time. The review indicates a need for more in-depth studies.

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“…The literature does not seem to provide a complete answer to whether SCC is as strong as conventional concrete with compressive strength, especially in terms of physical and chemical properties. Few studies [22][23][24] partially answer this question, but they usually concern the high-performance concrete. Other studies yield results for low to medium compressive strength SCCs [25][26][27].…”

Section: Mission Statementmentioning

confidence: 99%

Determining the tribological features of concrete and assessing the service life of architectural facilities

Kuzmin¹,

Martínez‐García²,

Kharitonenkov³

et al. 2021

J. meas. eng.

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The construction industry is increasingly striving to improve the tribological features of architectural structures to increase their service life. The focus lies on self-compacting concrete (SCC) as the most appropriate option to fulfil this task. However, there are still some problems related to its durability, particularly in terms of physical and chemical properties, which are crucial in preventing corrosion of the reinforcement. This study seeks to assess the durability of self-compacting concrete and С20/25 class concrete with similar compressive strength. The measurements taken during the study include the primary strength indicators (water porosity, chloride diffusion, and oxygen permeability) and additional properties necessary for a better understanding (mercury porosity, capillary water absorption, carbonation, and ammonium nitrate leaching). Mixes of SCC and conventional concrete contained the same raw materials in identical proportions. Test results revealed that the service life of these two concretes could be considered equivalent. Therefore, self-compacting concrete with specific compressive strength can be regarded as durable as shock concrete. The scientific novelty of the study lies in the measurement of durability properties and the service life of concrete structures taking the coefficient of friction on a steel plate for the purpose of comparing concretes with equivalent compressive strength.

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Formwork Pressure Model for Self-Consolidating Concrete Using a Pressure Decay Signature

Cited by 8 publications

References 11 publications

Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix

Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix

Lateral Formwork Pressure for Self-Compacting Concrete—A Review of Prediction Models and Monitoring Technologies

Determining the tribological features of concrete and assessing the service life of architectural facilities

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