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Christof Schrofl - One of the best experts on this subject based on the ideXlab platform.
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effect of superabsorbent polymers saps on rheological properties of fresh cement based mortars development of yield stress and plastic viscosity over time
Cement and Concrete Research, 2015Co-Authors: Viktor Mechtcherine, Egor Secrieru, Christof SchroflAbstract:Abstract Superabsorbent polymers (SAPs) are a new, promising, multipurpose Chemical Admixture for concrete. This article addresses the rheological behaviour of fresh, cement-based mortars modified with SAP. Two types of SAP with differing water absorption and desorption kinetics were used. Additionally, for one the grading was varied. Three reference mortars were investigated. The rheological properties of these fresh mortars were tested for 90 min by continuous flow rheometry. It was found that the distinct kinetics of water uptake inherent in the SAP samples, as governed by their particular Chemical structures, is the major factor that governs the rheological properties of fresh mortar. Furthermore, the grading of SAP distinctly affects the development of yield stress and plastic viscosity over time. The particular effects of specific SAP addition on the rheological characteristics of a mortar depend on the water-to-binder ratio, the dosage of superplasticizer, and the dosage of silica fume, if present.
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Effect of superabsorbent polymers (SAPs) on rheological properties of fresh cement-based mortars — Development of yield stress and plastic viscosity over time
Cement and Concrete Research, 2014Co-Authors: Viktor Mechtcherine, Egor Secrieru, Christof SchroflAbstract:Abstract Superabsorbent polymers (SAPs) are a new, promising, multipurpose Chemical Admixture for concrete. This article addresses the rheological behaviour of fresh, cement-based mortars modified with SAP. Two types of SAP with differing water absorption and desorption kinetics were used. Additionally, for one the grading was varied. Three reference mortars were investigated. The rheological properties of these fresh mortars were tested for 90 min by continuous flow rheometry. It was found that the distinct kinetics of water uptake inherent in the SAP samples, as governed by their particular Chemical structures, is the major factor that governs the rheological properties of fresh mortar. Furthermore, the grading of SAP distinctly affects the development of yield stress and plastic viscosity over time. The particular effects of specific SAP addition on the rheological characteristics of a mortar depend on the water-to-binder ratio, the dosage of superplasticizer, and the dosage of silica fume, if present.
Viktor Mechtcherine - One of the best experts on this subject based on the ideXlab platform.
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effect of superabsorbent polymers saps on rheological properties of fresh cement based mortars development of yield stress and plastic viscosity over time
Cement and Concrete Research, 2015Co-Authors: Viktor Mechtcherine, Egor Secrieru, Christof SchroflAbstract:Abstract Superabsorbent polymers (SAPs) are a new, promising, multipurpose Chemical Admixture for concrete. This article addresses the rheological behaviour of fresh, cement-based mortars modified with SAP. Two types of SAP with differing water absorption and desorption kinetics were used. Additionally, for one the grading was varied. Three reference mortars were investigated. The rheological properties of these fresh mortars were tested for 90 min by continuous flow rheometry. It was found that the distinct kinetics of water uptake inherent in the SAP samples, as governed by their particular Chemical structures, is the major factor that governs the rheological properties of fresh mortar. Furthermore, the grading of SAP distinctly affects the development of yield stress and plastic viscosity over time. The particular effects of specific SAP addition on the rheological characteristics of a mortar depend on the water-to-binder ratio, the dosage of superplasticizer, and the dosage of silica fume, if present.
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Effect of superabsorbent polymers (SAPs) on rheological properties of fresh cement-based mortars — Development of yield stress and plastic viscosity over time
Cement and Concrete Research, 2014Co-Authors: Viktor Mechtcherine, Egor Secrieru, Christof SchroflAbstract:Abstract Superabsorbent polymers (SAPs) are a new, promising, multipurpose Chemical Admixture for concrete. This article addresses the rheological behaviour of fresh, cement-based mortars modified with SAP. Two types of SAP with differing water absorption and desorption kinetics were used. Additionally, for one the grading was varied. Three reference mortars were investigated. The rheological properties of these fresh mortars were tested for 90 min by continuous flow rheometry. It was found that the distinct kinetics of water uptake inherent in the SAP samples, as governed by their particular Chemical structures, is the major factor that governs the rheological properties of fresh mortar. Furthermore, the grading of SAP distinctly affects the development of yield stress and plastic viscosity over time. The particular effects of specific SAP addition on the rheological characteristics of a mortar depend on the water-to-binder ratio, the dosage of superplasticizer, and the dosage of silica fume, if present.
Yohannes L Yaphary - One of the best experts on this subject based on the ideXlab platform.
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reduction in cement content of normal strength concrete with used engine oil ueo as Chemical Admixture
Construction and Building Materials, 2020Co-Authors: Yohannes L YapharyAbstract:Abstract In this study, the coupling effects of admixing a used engine oil (UEO) and reducing the cement paste content on the properties of a normal strength concrete were investigated. Initially, various tests were performed to determine the effect of the admixed UEO on the properties (i.e. workability, air content, setting times, strengths, drying shrinkage, and freezing and thawing (F–T) durability) of the reference concrete (formed in accordance with ASTM C494). Based on the acquired knowledge regarding the aforementioned effects, the Chemical-Admixture type of the UEO was evaluated. The UEO largely complies with the ASTM C494 type A water-reducing Admixture specifications. The admixed UEO can facilitate the production of concrete with 9.4% less cement content than that in the reference concrete, but with comparable properties. This study provides a basis for realizing a more economical and eco-friendly production of concrete by both reducing its cement content and admixing UEO.
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reduction in cement content of normal strength concrete with used engine oil ueo as Chemical Admixture
Construction and Building Materials, 2020Co-Authors: Yohannes L YapharyAbstract:Abstract In this study, the coupling effects of admixing a used engine oil (UEO) and reducing the cement paste content on the properties of a normal strength concrete were investigated. Initially, various tests were performed to determine the effect of the admixed UEO on the properties (i.e. workability, air content, setting times, strengths, drying shrinkage, and freezing and thawing (F–T) durability) of the reference concrete (formed in accordance with ASTM C494). Based on the acquired knowledge regarding the aforementioned effects, the Chemical-Admixture type of the UEO was evaluated. The UEO largely complies with the ASTM C494 type A water-reducing Admixture specifications. The admixed UEO can facilitate the production of concrete with 9.4% less cement content than that in the reference concrete, but with comparable properties. This study provides a basis for realizing a more economical and eco-friendly production of concrete by both reducing its cement content and admixing UEO.
Egor Secrieru - One of the best experts on this subject based on the ideXlab platform.
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effect of superabsorbent polymers saps on rheological properties of fresh cement based mortars development of yield stress and plastic viscosity over time
Cement and Concrete Research, 2015Co-Authors: Viktor Mechtcherine, Egor Secrieru, Christof SchroflAbstract:Abstract Superabsorbent polymers (SAPs) are a new, promising, multipurpose Chemical Admixture for concrete. This article addresses the rheological behaviour of fresh, cement-based mortars modified with SAP. Two types of SAP with differing water absorption and desorption kinetics were used. Additionally, for one the grading was varied. Three reference mortars were investigated. The rheological properties of these fresh mortars were tested for 90 min by continuous flow rheometry. It was found that the distinct kinetics of water uptake inherent in the SAP samples, as governed by their particular Chemical structures, is the major factor that governs the rheological properties of fresh mortar. Furthermore, the grading of SAP distinctly affects the development of yield stress and plastic viscosity over time. The particular effects of specific SAP addition on the rheological characteristics of a mortar depend on the water-to-binder ratio, the dosage of superplasticizer, and the dosage of silica fume, if present.
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Effect of superabsorbent polymers (SAPs) on rheological properties of fresh cement-based mortars — Development of yield stress and plastic viscosity over time
Cement and Concrete Research, 2014Co-Authors: Viktor Mechtcherine, Egor Secrieru, Christof SchroflAbstract:Abstract Superabsorbent polymers (SAPs) are a new, promising, multipurpose Chemical Admixture for concrete. This article addresses the rheological behaviour of fresh, cement-based mortars modified with SAP. Two types of SAP with differing water absorption and desorption kinetics were used. Additionally, for one the grading was varied. Three reference mortars were investigated. The rheological properties of these fresh mortars were tested for 90 min by continuous flow rheometry. It was found that the distinct kinetics of water uptake inherent in the SAP samples, as governed by their particular Chemical structures, is the major factor that governs the rheological properties of fresh mortar. Furthermore, the grading of SAP distinctly affects the development of yield stress and plastic viscosity over time. The particular effects of specific SAP addition on the rheological characteristics of a mortar depend on the water-to-binder ratio, the dosage of superplasticizer, and the dosage of silica fume, if present.
Piero Baglioni - One of the best experts on this subject based on the ideXlab platform.
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tricalcium silicate hydration reaction in the presence of comb shaped superplasticizers boundary nucleation and growth model applied to polymer modified pastes
Journal of Physical Chemistry C, 2012Co-Authors: Francesca Ridi, Frank Winnefeld, Emiliano Fratini, Paola Luciani, Piero BaglioniAbstract:The Boundary Nucleation and Growth Model (BNGM), developed for the analysis of the hydration reaction of tricalcium silicate, has been applied to study the kinetic behavior of pastes containing Chemical Admixtures. Four comb-shaped polycarboxylate ether (PCE) superplasticizers with well-known molecular structures have been added to tricalcium silicate. The BNGM analysis performed on this series of additives allows insights into the effect of the molecular architecture of the PCEs on the induction time and rate constants. The results show that decreasing the length of the polyethylene oxide side chains of the PCE molecules increases the induction time. Also, the side chain density, which highly influences the adsorption of the polymer to the C3S unreacted grains, is shown to significantly affect the duration of the induction period: in particular, molecules with low side chain density delay the setting of the paste to a greater extent than molecules with denser side chains. Moreover, the Chemical Admixture...