Rheology of Fresh Cement-Based Materials
Rheology of Fresh Cement-Based Materials

Author: Qiang Yuan

Publisher: CRC Press

Published: 2022-12-28

Total Pages: 408

ISBN-13: 1000821277

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This book introduces fundamentals, measurements, and applications of rheology of fresh cement-based materials. The rheology of a fresh cement-based material is one of its most important aspects, characterizing its flow and deformation, and governing the mixing, placement, and casting quality of a concrete. This is the first book to bring the field together on an increasingly important topic, as new types of cement-based materials and new concrete technologies are developed. It describes measurement equipment, procedures, and data interpretation of the rheology of cement paste and concrete, as well as applications such as self-compacting concrete, pumping, and 3D printing. A range of other cement-based materials such as fiber-reinforced concrete, cemented paste backfills, and alkali-activated cement are also examined. Rheology of Fresh Cement-Based Materials serves as a reference book for researchers and engineers, and a textbook for advanced undergraduate and graduate students.

Effect of Chemical Admixtures on Rheology of Cement Paste at High Temperature
Effect of Chemical Admixtures on Rheology of Cement Paste at High Temperature

Author: S. Al-Martini

Publisher:

Published: 2007

Total Pages: 17

ISBN-13:

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Placement of cement-based materials in hot weather conditions encounters many problems due to the rapid evaporation of mixing water and the accelerated hydration of cement. Such materials are also adversely affected at elevated temperatures by an increased water demand, shorter setting time, and more rapid slump loss. These problems can be mitigated using adequate chemical admixtures. However, technical data on such admixtures are commonly developed at normal temperatures, and there is a real need to investigate their performance at hot temperatures. In the current research, the rheological properties of portland cement pastes with a water-cement ratio (w/c) of 0.35 and 0.50 are investigated at different temperatures in the range of 20 to 45°C using an advanced shear-stress/shear-strain controlled rheometer. The influence of water-reducing and retarding admixture, polycarboxylate, naphthalene sulfonate, and melamine-based high-range water-reducing admixtures (HRWR) in addition to mid-range water-reducing admixtures (MRWR) on the rheological properties of cement paste at various temperatures was also examined. The paper aims at formulating recommendations for the effective use of chemical admixtures at high temperature, which should enhance the rheological properties of cement-based materials in hot weather conditions.

Bio-Based Polymers for Engineered Green Materials
Bio-Based Polymers for Engineered Green Materials

Author: Gianluca Tondi

Publisher: MDPI

Published: 2020-05-20

Total Pages: 568

ISBN-13: 303928925X

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With daily signals, Nature is communicating us that its unconscious wicked exploitation is no more sustainable. Our socio-economic system focuses on production increasing without considering the consequences. We are intoxicating ourselves on a daily bases just to allow the system to perpetuate itself. The time to switch into more natural solutions is come and the scientific community is ready to offer more natural product with comparable performance then the market products we are used to deal with. This book collects a broad set of scientific examples in which research groups from all over the world, aim to replace fossil fuel-based solutions with biomass derived materials. In here, some of the most innovative developments in the field of bio-materials are reported considering topics which goes from biomass valorization to the synthesis of high preforming bio-based materials.

Sensitivity of Rheological Properties of Cement Paste with SCC Consistency
Sensitivity of Rheological Properties of Cement Paste with SCC Consistency

Author: Azadehalsadat Asghari

Publisher:

Published: 2018

Total Pages: 201

ISBN-13:

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"Robustness, which is defined as the capacity of a mixture to tolerate small variations in constituent elements, mixing parameters or temperature that are inevitable with production at any significant scale, is a key property to expand the practical implementation of self-consolidating concrete (SCC). At the first step, the effect of different amount of water, amount of superplastizer, mixing time, mixing speed and the addition time of superplastizer on the rheological properties of cement pastes with SCC consistency, has been evaluated. Two different SCC mix design concepts, the powder-type and VMA-type were selected for this research. The results show that the selected powder-type mix design is more robust than the VMA-type to a change in addition time of SP. Then, an experimental study was conducted to evaluate different mix design parameters by varying the binder combination, the type of PCE-SP and the addition of viscosity-modifying agent (VMA) to determine which particular parameters cause the largest difference in rheological behavior due to a variation in adding time of SP. In third step, the robustness of the "loss of workability" of flowable cement pastes, which is mainly affected by variations in the water content and the adding time of the superplasticizer, was evaluated. A comparison study was performed to develop a more accurate vision on robustness of cement paste, and also concrete, by taking into account the time-dependency of the rheological properties. Furthermore, the change in rheological properties of well-dispersed cement pastes subjected to different maximum shear rates has been conducted. It was shown that the choice of maximum shear rate during the rheological measurements is critical for the values of the rheological properties"--Abstract, page iv.

Multifunctional Cement-Based Sensors for Intelligent Infrastructure
Multifunctional Cement-Based Sensors for Intelligent Infrastructure

Author: Wengui Li

Publisher: CRC Press

Published: 2024-09-11

Total Pages: 319

ISBN-13: 1040114644

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Multifunctional Cement-Based Sensors for Intelligent Infrastructure: Design, Fabrication and Application covers the development and use of cement-based sensors for monitoring structural health, durability, and environmental conditions in concrete infrastructure. Monitoring the performance and condition of bridges, buildings, and roads improves safety and longevity while preventing failures and reducing maintenance costs. Cement-based sensors offer low cost, ease of installation, and compatibility with existing building materials, and can also provide real-time monitoring data to detect and diagnose potential issues before they become major problems. This book sets out the principles of the sensing mechanisms, fabrication techniques, and performance evaluation along with several case studies. It also provides a glimpse into a future where concrete structures will not only stand as pillars of strength but also become an indispensable part of smart cities as the core of automation. The book suits researchers, engineers, and practitioners involved in design, construction, and maintenance of concrete buildings and infrastructure. Wengui Li is a Scientia Associate Professor in the School of Civil and Environmental Engineering and the group leader of Intelligent Concrete and Infrastructure Materials in the Centre for Infrastructure Engineering and Safety (CIES) at The University of New South Wales (UNSW Sydney), Australia. He is the recipient of Australian Research Council (ARC) Future Fellow and ARC DECRA Fellow. Wenkui Dong earned his PhD from the University of Technology Sydney, Australia. Currently, he works as Postdoctoral Research Fellow at the Institute of Construction Materials at Technische Universität Dresden, Germany. Surendra P. Shah is a Presidential Distinguished Professor at the University of Texas at Arlington, Walter P. Murphy Professor (emeritus) at Northwestern University, and a member of the National Academy of Engineering, USA.