Research progress and application of negative temperature cementitious materials

The use of calcined clay and limestone as supplementary cementitious materials, can have a certain influence on the hydration of Portland cement. This paper reviewed the influence of limestone and calcined clay and the mixture of limestone and calcined clay on the hydration of cement. Both limestone and calcined clay accelerate the hydration reaction in the early hydration age and enhance the properties of cement. Limestone reacts with C3A to form carboaluminate, which indirectly stabilized the presence of ettringite, while calcined clay consumed portlandite to form C-(A)-S-H gel, additional hydration products promote the densification of pore structure and increase the mechanical properties. The synergistic effect of calcined clay and limestone stabilize the existence of ettringite and stimulate the further formation of carboaluminate, as well as the C-(A)-S-H gel, contributed to a dense microstructure.

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Research Progress on Early Autogenous Shrinkage of Cement-Based Cementitious Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.2738 ◽

2013 ◽

Vol 634-638 ◽

pp. 2738-2741

Author(s):

Wei Huang ◽

Tao Zhang ◽

Yun Yun Xu

Keyword(s):

High Performance ◽

High Performance Concrete ◽

Research Work ◽

Autogenous Shrinkage ◽

Cementitious Materials ◽

Mineral Admixtures ◽

Research Progress ◽

Cement Ratio ◽

Water Cement Ratio ◽

Improvement Measures

Concrete autogenous shrinkage phenomenon would adversely affect the mechanical properties and durability of concrete, this phenomenon is important. Autogenous shrinkage problem of low water-cement ratio of the with high mineral admixtures, cement-based cementitious materials was introduced. The main reason for high-performance concrete early cracking being autogenous shrinkage was pointed out. Based on the home and abroad research status of low water cement ratio of the cement paste and concrete autogenous shrinkage, especially for early autogenous shrinkage phenomenon, the mechanism of autogenous shrinkage and the measure method is presented, and the improvement measures and the possible problems the need for further research work is presented.

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Research progress of rice husk ash in solidified soil

E3S Web of Conferences ◽

10.1051/e3sconf/202129302018 ◽

2021 ◽

Vol 293 ◽

pp. 02018

Author(s):

HAO Tong ◽

LIU Qian ◽

Fa-Guang Leng ◽

Tian-Long Qiao

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Cementitious Materials ◽

Mineral Admixture ◽

Added Value ◽

Research Progress ◽

Utilization Rate ◽

Application Range ◽

High Silicon ◽

Cementing Material

Rice husk ash is a kind of volcanic ash material with high silicon. This also provides a feasibility for rice husk ash as cement-based auxiliary cementing material. China is rich in rice husk resources, and the rice husk ash is stacked. Using rice husk ash (RHA) instead of traditional cementitious materials can effectively solve the environmental pollution caused by the accumulation of rice husk ash. Domestic and international scholar have added rice husk ash as mineral admixture to concrete, but the utilization rate is very low. In order to increase the added value of rice husk ash, the high silicon property of rice husk ash was used to solidify soil. The application range of solidified soil is wide, the requirements for materials are not high, and the functions are different, which can realize the extensive use of rice husk ash. This paper summarizes the literature on comprehensive utilization of rice husk ash at home and abroad, systematically expounds the physicochemical properties and production process of rice husk ash, introduces the application of rice husk ash in solidified soil, and points out the unsolved problems in this field, which provides a direction for the further development.

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Research Progress on Numerical Models for Self-Healing Cementitious Materials

Advanced Materials Interfaces ◽

10.1002/admi.201701378 ◽

2018 ◽

Vol 5 (17) ◽

pp. 1701378 ◽

Cited By ~ 13

Author(s):

Tony Jefferson ◽

Etelvina Javierre ◽

Brubeck Freeman ◽

Ali Zaoui ◽

Eddie Koenders ◽

...

Keyword(s):

Numerical Models ◽

Cementitious Materials ◽

Research Progress ◽

Self Healing

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A Review on the Application of Nanocellulose in Cementitious Materials

Nanomaterials ◽

10.3390/nano10122476 ◽

2020 ◽

Vol 10 (12) ◽

pp. 2476

Author(s):

Aofei Guo ◽

Zhihui Sun ◽

Noppadon Sathitsuksanoh ◽

Hu Feng

Keyword(s):

Mechanical Properties ◽

Global Warming ◽

Energy Consumption ◽

Environmental Issues ◽

Cementitious Materials ◽

Research Progress ◽

Future Research ◽

Cellulose Nanofibril ◽

Fresh Properties ◽

Matrix Type

The development of the concrete industry is always accompanied by some environmental issues such as global warming and energy consumption. Under this circumstance, the application of nanocellulose in cementitious materials is attracting more and more attention in recent years not only because of its renewability and sustainability but also because of its unique properties. To trace the research progress and provide some guidance for future research, the application of nanocellulose to cementitious materials is reviewed. Specifically, the effects of cellulose nanocrystal (CNC), cellulose nanofibril (CNF), bacterial cellulose (BC), and cellulose filament (CF) on the physical and fresh properties, hydration, mechanical properties, microstructure, rheology, shrinkage, and durability of cementitious materials are summarized. It can be seen that the type, dosage, and dispersion of nanocellulose, and even the cementitious matrix type can lead to different results. Moreover, in this review, some unexplored topics are highlighted and remain to be further studied. Lastly, the major challenge of nanocellulose dispersion, related to the effectiveness of nanocellulose in cementitious materials, is examined in detail.

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Recent Progress in the Application of Coconut and Palm Oil Fibres in Cement-Based Materials

Sustainability ◽

10.3390/su132212865 ◽

2021 ◽

Vol 13 (22) ◽

pp. 12865

Author(s):

Erika Futami ◽

Payam Shafigh ◽

Herda Yati Binti Katman ◽

Zainah Ibrahim

Keyword(s):

Construction Industry ◽

Review Paper ◽

Cementitious Materials ◽

Natural Fibre ◽

Research Progress ◽

Future Research ◽

Cementitious Composites ◽

Mechanical And Thermal Properties ◽

The Sustainable Development ◽

Alternative Material

Cementitious materials are widely used in the construction industry. These materials have high compressive strength and huge environmental effects but low tensile and flexural strength. Thus, researching these materials to make them environmentally friendly is very important in terms of the sustainable development of the construction industry. In recent years, the amount of research about cementitious composites reinforced with natural fibre has increased annually. This review paper was presented to understand the latest research progress on these fibres and the needs of future research to encourage the construction industry to apply these materials. The optimum dosage of natural fibre depending on the purposes can improve the physical, mechanical and thermal properties of cementitious composites, and natural fibre is highly expected to become an alternative material of synthetic fibres, such as steel, plastic and carbon fibre.

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Research Progress on Durability of Cellulose Fiber-Reinforced Cement-Based Composites

International Journal of Polymer Science ◽

10.1155/2021/1014531 ◽

2021 ◽

Vol 2021 ◽

pp. 1-13

Author(s):

Jie Liu ◽

Chun Lv

Keyword(s):

Cellulose Fiber ◽

Cementitious Materials ◽

Internal Curing ◽

Supplementary Cementitious Materials ◽

Research Progress ◽

Cement Matrix ◽

Hydroxyl Groups ◽

Fiber Reinforced ◽

The Matrix ◽

Reinforced Cement

The performance of cellulose fiber-reinforced cement-based composites (CFCCs) depends not only on the characteristics of the cement matrix and fibers but also on the bonding property of the matrix and fibers. The durability of cement-based composites including various properties such as impermeability, frost resistance, and carbonization resistance has an important impact on the long-term service life of the matrix structure. The presence of a large number of hydroxyl groups on the molecular chain of cellulose can promote the formation of intra- and intermolecular hydrogen bonds of cellulose. This special structure imparts the cellulose high hydrophilicity, which leads the cement hydration C-S-H gel to adhere to the surface of cellulosic fibers (CFs) and induce its growth. The cavity of CFs has good water absorption and can be used as an internal curing fiber for the continuous hydration of cement-based composites. But CFs in the Portland cement matrix tend to deteriorate under strong alkali conditions. This paper presents a review of the research on the durability of CFCCs. The methods and paths to improve the durability of CFCCs are summarized and analyzed from the perspectives of the internal curing of CFs, the deterioration of the performance of CFs in the matrix, and the use of many types of supplementary cementitious materials. Finally, the development and engineering application of CFCCs have been prospected.

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Which Data to Meta-Analyze, and How?

Zeitschrift für Psychologie ◽

10.1027/2151-2604/a000357 ◽

2019 ◽

Vol 227 (1) ◽

pp. 64-82 ◽

Cited By ~ 3

Author(s):

Martin Voracek ◽

Michael Kossmeier ◽

Ulrich S. Tran

Keyword(s):

Empirical Research ◽

Meta Analysis ◽

Curve Analysis ◽

Research Progress ◽

Primary Data ◽

Statistical Procedures ◽

Graphical Displays ◽

Primary Data Analysis ◽

Meta Analyses ◽

Data Analytic

Abstract. Which data to analyze, and how, are fundamental questions of all empirical research. As there are always numerous flexibilities in data-analytic decisions (a “garden of forking paths”), this poses perennial problems to all empirical research. Specification-curve analysis and multiverse analysis have recently been proposed as solutions to these issues. Building on the structural analogies between primary data analysis and meta-analysis, we transform and adapt these approaches to the meta-analytic level, in tandem with combinatorial meta-analysis. We explain the rationale of this idea, suggest descriptive and inferential statistical procedures, as well as graphical displays, provide code for meta-analytic practitioners to generate and use these, and present a fully worked real example from digit ratio (2D:4D) research, totaling 1,592 meta-analytic specifications. Specification-curve and multiverse meta-analysis holds promise to resolve conflicting meta-analyses, contested evidence, controversial empirical literatures, and polarized research, and to mitigate the associated detrimental effects of these phenomena on research progress.

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