Article
Construction & Building Technology
Radi Al-Rashed, Maher Al-Jabari
Summary: Crystallization-based waterproofing is a versatile technology that enhances concrete durability by reducing moisture penetration and increasing resistance against chloride ion penetration. It also improves water retention for better cement hydration and enhances surface characteristics.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Construction & Building Technology
Yuxin Cai, Qing-Feng Liu
Summary: This paper provides an overview of the studies on the stability of fresh concrete and its impact on the durability of reinforced concrete. The mechanism of fresh concrete stability and the methods for evaluating stability are described. The effects of raw material properties, mix design parameters, and on-site construction factors on stability are discussed. The influence of fresh concrete stability on concrete cover permeability, interface defect, and reinforcement corrosion initiation time is also explained systematically.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Shaoyan Liu, Zhen He, Lingling Hu
Summary: This study aims to characterize the bond behavior and micro-properties of the fresh-on-fresh cast interface of ultrahigh-performance concrete-normal concrete layers, and compare it with a fresh-on-harden cast interface. The results show that the bonding strength of the fresh-on-fresh cast interface is 138% higher than that of the fresh-on-harden cast interface. The interface zone is formed by the intimate contact and staggered growth of the two types of concrete, and it exhibits gradual variation of porosity and local indentation modulus.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Abdul Rahman El Zein, Yannick Vanhove, Chafika Djelal, Olivier Madec, Philippe Gotteland
Summary: This study investigates the movement of water in concrete using soil mechanics theory, different water-cement ratios, and oedometric tests. The results show a good correlation between water movement in concrete and time, depth, and stress levels.
MATERIALS AND STRUCTURES
(2021)
Article
Green & Sustainable Science & Technology
Zalipah Jamellodin, Lim Qian Yi, Qadir Bux Alias Imran Latif, Hassan Amer Algaifi, Rafidah Hamdan, Adel Al-Gheethi
Summary: This study investigated the effect of a lower sand replacement content in glass waste on the mechanical and durability properties of concrete. The results showed that a lower replacement percentage of glass waste leads to enhanced concrete strength and water permeability.
Article
Construction & Building Technology
J. Goertz, S. Wieprecht, K. Terheiden
Summary: The study shows that construction and expansion joints in concrete structures have a significant impact on moisture transport, and a dual permeability-based moisture modeling approach can effectively describe the characteristics of moisture transport, particularly suitable for modeling moisture distribution in larger structures.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Babar Ali, Muhammad Ahmad Farooq, Mohamed Hechmi El Ouni, Marc Azab, Ahmed Babeker Elhag
Summary: The use of fiber-reinforced concrete (FRC) was developed to address the low ductility and toughness of concrete, with natural aggregates and industrial fibers being challenged ecologically. By incorporating recycled aggregates (RA) and waste coconut fibers (CF), a cheap and eco-friendly FRC can be produced. The addition of CF, especially in combination with superplasticizer (SP), significantly improved the mechanical performance of the concrete mixes. The research also found that the addition of SP helped control the permeability of CF-reinforced mixes, and outdoor exposure did not degrade the compressive strength of CF reinforced mixes over a one-year period.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Viet Quoc Dang, Yuko Ogawa, Phuong Trinh Bui, Kenji Kawai
Summary: This study found that the use of non-desalted sea sand as fine aggregate in concrete can improve the mechanical properties and durability of concrete by accelerating the pozzolanic reactivity and early hydraulicity of supplementary cementitious materials. This validates the potential application of non-desalted sea sand for concrete production in coastal areas.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2022)
Review
Engineering, Civil
Junzheng Pan, Xiaojian Gao, Huan Ye
Summary: This study investigated the effect of water-binder ratio, sand ratio, and high-range water reducer (HRWR) content on the rheological behavior of mortar formulated from concrete mixture. The segregation of fresh concrete and hardened concrete was measured by two different modified methods. Sand ratio and HRWR content significantly influence yield stress but have little impact on plastic viscosity, while bleeding rate decreases with the increase of plastic viscosity.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2021)
Review
Construction & Building Technology
Pavan Kumar Diddi, Amit Srivastava, Sri Rama Chand Madduru
Summary: Nanotechnology in concrete has been a lively research area in the past three decades, with nanoparticles showing potential in improving the characteristics of cementitious materials for fast track repair concrete. Factors such as workability, setting time, mechanical strength, shrinkage, pore structure, and permeability are key considerations in evaluating the effectiveness of nano modified concrete in construction.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Multidisciplinary
Zhuguo Li
Summary: This paper proposes a microscopic approach to clarify the rheological behaviors of fresh concrete, deriving constitutive equations and rheological models based on the particle motions and contact angles. The numerical calculations confirm the ability of these models to describe the complex rheological behaviors of fresh concrete.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Geological
Peng Wang, XiaoTian Yang, Jian Zhang, Xueyan Ge
Summary: This study investigated the clogging of a soil pile in the vacuum preloading of dredged soil combined with a prefabricated vertical drain (PVD) through laboratory model tests and analytical modeling. The formation of a soil pile was clarified by the variation in water content and permeability of soil around the PVD. Seepage and consolidation tests showed that the clogging effect slowed down the drainage of pore water rather than stopping it completely. An analytical model considering the clogging effect and the varying permeability and compressibility of soil was established. Based on a comparison with existing results, an empirical linear relationship was developed to estimate the permeability and scale of a soil pile in vacuum-assisted soil consolidation. The study found that a soil pile with lower permeability or larger diameter resulted in more serious clogging effects on soil consolidation, and the development of the clogging effect decreased as the soil pile extended.
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GEOTECHNICAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Yunkang Rao, Haiying Fu, Tao Yang, Huailin Chen, Zhe Zhang, Haojiang Ding
Summary: This study comparatively investigated the sand and clay clogging mechanisms of pervious concrete pavement and analyzed the sediment distribution in sand-clogged and clay-clogged PC. The results show that the clogging patterns of sand depend on particle size, while clay clogging occurs mainly at a depth of approximately 48mm. Dried clay is difficult to wash away, but pressure washing can effectively remove undried clay. This study provides evidence for developing effective pavement maintenance strategies.
SCIENTIFIC REPORTS
(2022)
Review
Construction & Building Technology
Hammad Ahmed Shah, Qiang Yuan, Shenghao Zuo
Summary: This study emphasizes the importance of the air-void system in fresh and hardened concretes on different properties, and discusses in detail the factors affecting the parameters of the air-void system.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Crystallography
Haining Geng, Qing Xu, Saiful B. Duraman, Qiu Li
Summary: This study investigates the impact of rheology of fresh alkali-activated slag paste on the performance of pervious concrete, revealing the significant influence of rheology on the properties of pervious concrete. The sedimentation of paste, connected porosity, tensile strength, and water permeability are closely related to the rheological properties of fresh paste in pervious concrete.
Article
Construction & Building Technology
Yohan Jacquet, Arnaud Perrot, Vincent Picandet
Summary: This study investigated the construction methods based on digital concrete technologies, specifically focusing on the extrusion-based process. It highlighted the different strategies and rheological requirements involved in printing concrete structures using fluid and firm materials. By analyzing the behavior of cement paste and mortar under various stresses, it described the transition from ductile fluid material to brittle and firm material, and the corresponding plasticity criteria needed to predict strength under different solicitations.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Construction & Building Technology
T. Craipeau, F. Toussaint, A. Perrot, T. Lecompte
Summary: This study aims to investigate the evolution of the concrete/formwork interface at very early age, measuring the friction evolution at this interface during the first hydration period. The role of pore water pressure on formwork friction was explored, and the effect of mix-design parameters such as air content was described. Finally, a model to predict the friction force at very early age was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Hanane Amara, Nourredine Arabi, Arnaud Perrot
Summary: The study explores the rheological properties relationship between self-compacting concrete (SCC) and concrete equivalent mortar (CEM), validating the effectiveness of unconventional tools used in CEM. Experimental results show that the mixture series meet SCC acceptance criteria, but are influenced by superplasticizer dosage and replacement of natural aggregates with recycled aggregates. The slump flow test of SC-CEM appears to be a reliable method for predicting its yield stress.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Editorial Material
Construction & Building Technology
Arnaud Perrot
MATERIALS AND STRUCTURES
(2022)
Article
Construction & Building Technology
Dirk Lowke, Inka Mai, Emmanuel Keita, Arnaud Perrot, Daniel Weger, Christoph Gehlen, Friedrich Herding, Wenqiang Zuo, Nicolas Roussel
Summary: This paper focuses on the material-process interactions in particle bed binding. After classifying different particle bed binding techniques, the important material-process interactions and their underlying physics are discussed for selective cement activation and selective paste intrusion technique. By controlling the material and process parameters in sub-processes, the printing process and resulting material properties of printed components can be specifically controlled.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Yasmine Autem, Nathalie Bourgougnon, Simon Guiheneuf, Arnaud Perrot
Summary: In Brittany, invasive algae pose a threat to local ecosystems and the economy through massive strandings, especially in summer. Utilizing these invasive algae in green processes and materials, such as raw earth, could help control their spread. This study compared the effects of four invasive seaweeds found in Brittany on the fresh and hardened properties of raw earth material. The results showed that incorporating certain seaweeds, such as S. chordalis and S. muticum, in freeze-dried form or as polysaccharides, significantly increased the compressive strength and water resistance of the raw earth material.
MATERIALS AND STRUCTURES
(2023)
Review
Chemistry, Physical
Hao Chen, Daobo Zhang, Peng Chen, Ning Li, Arnaud Perrot
Summary: This paper provides a comprehensive review of the mechanical design of the E3DCP extruder system, including the extruder system, positioning system, and advanced fittings. The effects of these designs on extrudability are discussed in relation to the extrusion driving forces and extrusion resistive forces. The authors also propose a classification framework for the E3DCP system, which could assist in a more systematic design process.
Article
Chemistry, Physical
Sandipan Kaushik, Mohammed Sonebi, Giuseppina Amato, Utpal Kumar Das, Arnaud Perrot
Summary: Efforts have been made globally to utilize various cementitious materials, admixtures, and fibers in the production of 3D printable mortar (3DPM). The rheological and material strength properties are crucial for successful 3D concrete printing, and the optimization of mix composition is challenging due to the complexity of required characteristics. This research aims to optimize the rheological properties and material strength of 3DPM and develops models to predict the performance of 3DPM based on primary parameters. Cement, fly ash, and superplasticiser have significant effects on the properties of mortar, while basalt fiber influences the static yield stress and flexural strength of 3DPM. Regression models and desirability function are useful tools for the optimization and prediction of 3DPM performance.
Article
Construction & Building Technology
Hugo Varela, Gonzalo Barluenga, Arnaud Perrot
Summary: 3D printing technology has provided new design and structural opportunities for cement-based systems in architectural construction. This study evaluates the impact of nanoclays and viscosity modifying admixtures on the rheological properties and extrusion of cement-based systems for 3D printing. The results show that the combination of certain additives improves extrusion and structural build-up, but requires larger amounts of water-reducing admixture.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
M. Barry, M. Clement, D. Rangeard, Y. Jacquet, A. Perrot
Summary: This article examines the impact of manufactured crushed sand variability on the consistency of mortars. Through testing various crushed sand contents and origins, the shear yield stress of mortars is measured and predicted using a homogenisation model. The findings contribute to better understanding and control of the large variability in crushed sand and its effect on mortars' consistency and rheology.
MATERIALS AND STRUCTURES
(2023)
Article
Chemistry, Physical
Yohan Jacquet, Arnaud Perrot
Summary: This paper proposes a new device that can simultaneously reinforce 3D-printed structures and act as an inline quality-control device. The device consists of a rotating system and a hollow needle, which can drive a reinforcing cable or yarn and inject cement grout to improve bonding. The rotation is induced by a stepper motor, and the torque required to penetrate the needle can be used as a quality-control index.
Article
Construction & Building Technology
Mathieu Audren, Simon Guiheneuf, Tangi Le Borgne, Damien Rangeard, Arnaud Perrot
Summary: This study demonstrates the use of quarry by-products in creating clay-based building materials with high compressive strength and proposes a model for mix design and standardization. The proportion of mud in the material is crucial for achieving optimal compressive strength, with a balance between increasing density and clay activity while reducing water content. The incorporation of mud also affects the material's granulometry and characteristics.
Proceedings Paper
Materials Science, Multidisciplinary
Sandipan Kaushik, Mohammed Sonebi, Giuseppina Amato, Arnaud Perrot, Utpal Kumar Das
Summary: This study investigates the influence of nanoclay on the fresh and rheological properties of 3D printing concrete. The addition of nanoclay reduces workability but increases the yield stress of the material, resulting in stable layers during the printing process.
MATERIALS TODAY-PROCEEDINGS
(2022)
Article
Construction & Building Technology
Y. Jacquet, V. Picandet, A. Perrot
Summary: The mixture design of cement-based materials for casting and 3D printing processes vary due to different workability requirements. A compromise between pumpability and printability is needed for 3D printing to build a structure capable of supporting its own weight. Specific admixtures can be used to ensure specific properties and prevent printing defects.
ACI MATERIALS JOURNAL
(2021)
