Characterization data of reference cement CEM I 42.5 R used for priority program DFG SPP 2005 “Opus Fluidum Futurum – Rheology of reactive, multiscale, multiphase construction materials”

Lu, Zhao; Haist, Michael; Ivanov, Dimitri A.; Jakob, Cordula; Jansen, Daniel; Leinitz, Sarah; Link, Julian; Mechtcherine, Viktor; Neubauer, J.; Plank, Johann; Schmidt, Wolfram; Schilde, Carsten; Schröfl, Christof; Sowoidnich, T.; Stephan, Dietmar

doi:10.1016/j.dib.2019.104699

Cited by 26 publications

(17 citation statements)

References 5 publications

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“…For compressive strength tests, cement paste prisms with both pure cement and cement with fly ash of 15 mm × 15 mm × 60 mm were prepared. Cement pastes were mixed containing OPC (CEM I 42.5 R, Heidelberg Cement, Heidelberg, Germany; technical characteristics given in data in brief by Lu et al [ 56 ]) and demineralized water. Fly ash was supplied by Powerment GmbH, Germany.…”

Section: Methodsmentioning

confidence: 99%

Performance of Rice Husk Ash as Supplementary Cementitious Material after Production in the Field and in the Lab

et al. 2020

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Supplementary cementitious materials (SCM) can reduce the total amount of Portland cement clinker in concrete production. Rice husk ashes (RHA) can be converted from an agricultural by-product to a high-performance concrete constituent due to a high amount of reactive silica with pozzolanic properties if they are burnt under controlled conditions. The way and duration of combustion, the cooling process as well as the temperature have an effect on the silica form and thus, the chemical and physical performance of the RHA. Various studies on the best combustion technique have been published to investigate the ideal combustion techniques. Yet, the process mostly took place under laboratory conditions. Investigating the difference between the performance of RHA produced in a rural environment and laboratory conditions is useful for the assessment and future enhancement of RHA production, and its application both as building material, for example in rural areas where it is sourced in large quantities, and as additive for high performance concrete. Thus, the paper presents a comparison between RHA produced under rudimentary conditions in a self-made furnace in the rural Bagamoyo, Tanzania and under controlled laboratory conditions at the Technical University of Munich, Germany, with different combustion methods and temperatures. In a second step, RHA was ground to reach particle size distributions comparable to cement. In a third step, cement pastes were prepared with 10%, 20% and 40% of cement replacement, and compared to the performance of plain and fly ash blended cement pastes. The results show that controlled burning conditions around 650 °C lead to high reactivity of silica and, therefore, to good performance as SCM. However, also the RHA burnt under less controlled conditions in the field provided reasonably good properties, if the process took place with proper burning parameters and adequate grinding. The knowledge can be implemented in the field to improve the final RHA performance as SCM in concrete.

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Section: Methodsmentioning

confidence: 99%

Performance of Rice Husk Ash as Supplementary Cementitious Material after Production in the Field and in the Lab

et al. 2020

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“…Deionized water was used for all experiments. For more information about the cement, the reader is referred to [31]. The used SP, provided by BASF, was designed for ready-mixed concrete.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Incompatibilities of Cement and Superplasticizers and Their Influence on the Rheological Behavior

et al. 2020

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The rheological behavior of cement paste and the improvement of its flowability takes center stage in many research projects. An improved flowability can be achieved by the addition of superplasticizers (SP), such as polycarboxylate ethers (PCE). In order to be able to use these PCEs effectively and in a variety of ways and to make them resistant to changes in the environment, it is crucial to understand the influence of SPs on cement hydration. For that reason, the topic of this paper was the incompatibility of a specific SP and an ordinary Portland cement (OPC). The incompatible behavior was analyzed using rheological tests, such as the spread flow test and penetration test, and the behavior was compared by means of an ultrasound technique and explained by the phase content measured by in-situ X-ray diffraction (XRD) the heat evolution measured by calorimetry, and scanning electron microscope (SEM) images. We showed that the addition of the SP in a high dosage led to a prevention of the passivation of the most reactive and aluminum-containing clinker phases, aluminate and brownmillerite. This induced the aluminate reaction to take place in the initial period and led to an immediate stiffening of the cement paste and, therefore, to the complete loss of workability. The results showed that in addition to the ettringite, which began to form directly after water addition, hemicarbonate precipitated. The fast stiffening of the paste could be prevented by delayed addition of the SP or by additional gypsum. This fast stiffening was not desirable for SPs, but in other fields, for example, 3D printing, this undesirable interaction could be used to improve the properties of printable mortar.

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“…The ultrasound gel, trade name: ''Ultraschallgel''; Gello GmbH, Germany, is a product used in medical investigations. The cement paste consisted of ordinary Portland cement CEM I 42.5 R, OPC; HeidelbergCement, Ennigerloh; see [18], and de-mineralized water. Both substances were provided by their respective producers.…”

Section: Investigated Substances and Sample Preparationmentioning

confidence: 99%

Interlaboratory study on rheological properties of cement pastes and reference substances: comparability of measurements performed with different rheometers and measurement geometries

et al. 2020

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This paper presents the results of an interlaboratory study of the rheological properties of cement paste and ultrasound gel as reference substance. The goal was to quantify the comparability and reproducibility of measurements of the Bingham parameters yield stress and plastic viscosity when measured on one specific paste composition and one particular ultrasound gel in different laboratories using

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Characterization data of reference cement CEM I 42.5 R used for priority program DFG SPP 2005 “Opus Fluidum Futurum – Rheology of reactive, multiscale, multiphase construction materials”

Cited by 26 publications

References 5 publications

Performance of Rice Husk Ash as Supplementary Cementitious Material after Production in the Field and in the Lab

Performance of Rice Husk Ash as Supplementary Cementitious Material after Production in the Field and in the Lab

Investigation of the Incompatibilities of Cement and Superplasticizers and Their Influence on the Rheological Behavior

Interlaboratory study on rheological properties of cement pastes and reference substances: comparability of measurements performed with different rheometers and measurement geometries

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