Showing papers in "Cement and Concrete Research in 2022"

TL;DR: In this article , the authors present a systematic discussion based on the analyses of eight realized 3DCP projects from around the world, and find that the structural application of printed concrete is limited, due to a lack of regulatory framework for expedient approval, as well as limited reinforcement options which require to resort to unreinforced masonry analogies.

TL;DR: In this article, the relationship between absorptivity in terms of absorption/desorption kinetics and retention of the absorbed liquid and the polymer physico-chemical principles is discussed and the use and effects of superabsorbent polymers in concrete are outlined and explained mechanistically.

TL;DR: In this article , the relationship between absorptivity in terms of absorption/desorption kinetics and retention of the absorbed liquid and the polymer physico-chemical principles is discussed, and the use and effects of superabsorbent polymers in concrete are outlined and explained mechanistically.

TL;DR: In this article , the authors present a systematic review and analysis of 3D concrete printing (3DCP) development and applications based on information from articles, patents and publicly available data.

TL;DR: A review of seawater-mixed concrete can be found in this paper , where the authors present a review of the last 16 years of research (2005-2021) on seawater mixed concrete.

TL;DR: A review of seawater-mixed concrete can be found in this paper, where the authors present a review of the last 16 years of research (2005-2021) on seawater mixed concrete.

TL;DR: In this article , a wide range of alternative strategies to improve the sustainability of concrete are discussed, including substitution of traditional constituents with alternative binders (both non-Portland clinker or alkali activated materials), recycled aggregates and non-drinking water, up to the description of high-durability/high performance mixtures.

TL;DR: In this paper , the reaction mechanisms involved in carbonation curing were investigated on fresh cement pastes, and the quantitative results gained allowed to link the curing conditions to the reactions kinetics, phase assemblage and microstructure evolutions.

TL;DR: In this paper , the effects of porosity metrics such as total defect content; 3D void topology (shape, size, and orientation); pore spatial, size and compactness distributions; and interconnectivity are quantitively investigated for a fibre-reinforced printable concrete (FRPC) mixture via X-ray computed tomography.

TL;DR: In this paper , a literature review is focused on the effectiveness of the most commonly used inhibitors as nitrites and amines, i.e., natural substances typically extracted from plants, are investigated as potential corrosion inhibitors.

TL;DR: In this article , a simple solid-solution model for hydrotalcite containing CO3, OH, SO4, Cl and NO3 was suggested, and the solubility products were calculated based on the solution analysis of samples re-equilibrated at different temperatures, while the entropy and heat capacity were obtained from the additivity method or the molar volume.

TL;DR: In this paper, MgO contained in cementitious materials is experimentally observed to precipitate as poorly crystalline hydrotalcite (Mg-Al LDH).

TL;DR: In this paper, the early stage of the degradation process of different cementitious materials in phosphoric acid was studied and the degradation kinetics, chemical and microstructural properties as well as dissolution rate of these binders were analyzed.

TL;DR: In this article , the 40th year since polycarboxylate superplasticizers (PCEs) have been invented by Nippon Shokubai company in Japan is marked.

TL;DR: In this paper , the early stage of the degradation process of different cementitious materials in phosphoric acid was studied and the degradation kinetics, chemical and microstructural properties as well as dissolution rate of these binders were analyzed.

TL;DR: In this article , the effect of KOH and NaOH on C-S-H structure and solubility was investigated, and the mean chain lengths (MCL) estimated from FTIR and Raman spectroscopy agree well with the trends from 29Si NMR.

TL;DR: In this article, the effect of KOH and NaOH on C-S-H structure and solubility was investigated, and the mean chain lengths (MCL) estimated from FTIR and Raman spectroscopy agree well with the trends from 29Si NMR.

TL;DR: In this article , the physicochemical properties of AAFS up to 800 °C were investigated and a quantitative assessment of the crack was developed to learn the cracking behavior, which revealed that the crack density exhibits a linear relationship with ultrasonic pulse velocity.

TL;DR: In this article , a 3D printed recycled coarse aggregate concrete (3DPRAC) was used for extrusion-based 3D printing, and the compressive and flexural properties were investigated at different RCA replacement ratios, ages, and construction forms.

TL;DR: In this article, the physicochemical properties of AAFS up to 800°C were investigated and a quantitative assessment of the crack was developed to learn the cracking behavior, which revealed that the crack density exhibits a linear relationship with ultrasonic pulse velocity.

TL;DR: In this article , the influence of carbon nanotube (CNT) and graphite nanoplatelet (GNP) used at 0 to 0.3%, by mass of binder, on composition, structure, and nano-mechanical characteristics of C-S-H of ultra-high performance concrete (UHPC).

TL;DR: In this article , three MLPs of tobermorite (9, 11, and 14 Å) are respectively constructed by Deep Potential (DP) method, and accuracy assessments of each MLP are performed via MD computations of lattice constants, radial and angular distribution function, mean square displacement and elastic properties.

TL;DR: In this article, the authors investigated the impact of water to binder ratio (0.4, 0.5, 0 6) and curing temperature (5, 20, 40°C) on the hydration kinetics of a ternary cement comprising clinker, slag and limestone.

TL;DR: Wang et al. as mentioned in this paper investigated the binding behaviors of representative heavy metals (HMs) in C3S, C3A and C4AF pastes and established a thermodynamic model to quantify cement pastes' immobilization capacity.

TL;DR: In this paper , the authors investigated the impact of water to binder ratio (0.4, 0.5, 0 6) and curing temperature (5, 20, 40 °C) on the hydration kinetics of a ternary cement comprising clinker, slag and limestone.

TL;DR: In this paper , a critical overview of current polycarboxylate (PCE) technology including the chemistry of different kinds of PCEs, characteristic molecular properties, their interaction with cement and application aspects are discussed.

TL;DR: In this paper , a detailed study of phase assemblage, porosity evolution and microstructural development was conducted on LC3 samples hydrated up to 3 years and compared to 90 days specimens.

TL;DR: In this article , a comprehensive review of research trends, open questions and key performance indicators for in situ additive manufacturing (MAM) is presented, and the authors support the discussion with potential architectural application scenarios and indicate why addressing MAM is an inherently multidisciplinary challenge.

TL;DR: In this article , the chemical, micromechanical, and morphological evolution of the principal binding phases of Portland cement under carbonation was explored, and a significant reduction in the indentation elastic modulus was revealed in compacts produced with carbonated powders.

TL;DR: In this article , the authors investigated the effect of temperature on the carbonation process, compressive strength and microstructure of CO2-cured cement paste, and found that the rate of improvement of cement paste's properties was accelerated when the curing temperature increased.