Application of neutron imaging to investigate fundamental aspects of durability of cement-based materials: A review

Zhang, Peng; Wittmann, Folker H.; Lura, Pietro; Müller, Harald; Han, Songbai; Zhao, Tong

doi:10.1016/j.cemconres.2018.03.003

Cited by 155 publications

(63 citation statements)

References 95 publications

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“…Capillary water absorption is widely used to evaluate the moisture transfer capacity in concrete . Therefore, the study of capillary water absorption is of great significance to the durability of concrete …”

Section: Introductionmentioning

confidence: 99%

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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Capillary absorption capacity has an important influence on the durability of concrete and is closely related to pore structure. In this study, the pore structure and capillary water absorption of samples were determined by low-field nuclear magnetic resonance spectroscopy and the gravimetric method, respectively. The test results show that the most probable pore diameter and equivalent pore diameter of cement-based materials increase with increasing water to cement ratio (w/c) and fly ash (FA) content and decrease with increasing curing age and cement to sand ratio (c/s). The porosity of cement-based materials increases with increasing w/c and c/s, decreases with increasing curing age, and first decreases and then increases with increasing FA content. The curves for the amount of capillary water absorption per unit area in specimens with the square root of time for cement-based material under different influence factors are similar and show obvious linear and stable stages.The capillary absorption coefficient is nearly linearly related to w/c or c/s, and nonlinearly related to curing age or FA content, observation that are well correlated with the porosity and square root of the equivalent pore radius. A modified model is proposed for the capillary absorption coefficient with consideration of the pore structure, and the theoretical results of the model are in good agreement with the test results. K E Y W O R D Scapillary absorption coefficient, cement-based materials, equivalent pore radius, low-field nuclear magnetic resonance spectroscopy, modified model, porosity Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Section: Introductionmentioning

confidence: 99%

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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“…Furthermore, Wang et al [191], Fan et al [192], and Zhang et al [193] investigated the effects of nanomaterials on the durability of RAC, and the results showed that the addition of nanomaterials reduced the porosity and improved the durability properties of RAC, which was attributed to that the nanomaterials had a good filling effect and pozzolanic effect. Referring to the measurement technique of NAC, new visualization technology can also be used to evaluate the durability of RAC [194,195].…”

Section: Other Improvement Methodsmentioning

confidence: 99%

Durability Studies on the Recycled Aggregate Concrete in China over the Past Decade: A Review

Yang

et al. 2019

Advances in Civil Engineering

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Since China hosted the Olympic Games in 2008, a mass of construction and demolition (C&D) wastes were produced with the rapid urbanization construction. Recycling the C&D waste into recycled aggregates (RA) is an effective method for reducing the amount of C&D wastes. Many studies on the properties of RA and the durability of recycled aggregate concrete (RAC) were conducted in China over the past decade. Due to the restrictions of various languages, some valuable studies on the durability of RAC are hard to be acquired by the scholars around the world. erefore, this paper is developed to review the studies on the durability of RAC in China, and the shrinkage behavior, chloride permeability, carbonation behavior, and freeze-thaw resistance of RAC are, respectively, introduced. Considering the waste concrete, bricks, and ceramics used in preparing RA are frequently mixed together in China, this study proposes an index of average water absorption rate to quantify the effects of RA types, quality, and replacement percentages on the durability of RAC. Meanwhile, the relationship between the average water absorption rate of RA and the durability parameters of RAC is established. Finally, the improving methods of RAC durability are introduced, and the RA particle shaping and carbonation modification are emphasized.

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“…Test procedures (1) The hydration heat test: The heat flow of the CCG was measured by using an isothermal calorimeter (TAM Air8). Each channel in the isothermal calorimeter has two measuring chambers, namely the sample chamber and the reference chamber [26].…”

Section: Figure 2 the Sample Preparation Processmentioning

confidence: 99%

“…Cement composites are the most widely used structural materials in the field of civil engineering [1]. With the rapid development of infrastructure construction, there is an increasing requirement on the performance of cement composites.…”

Section: Introductionmentioning

confidence: 99%

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

Xu¹

2020

Ceramics - Silikaty

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Graphene oxide (GO) has attracted increasing attention for its application in cementitious materials as it can be used to regulate the hydration products of cement and improve the properties of cement composites. This paper investigated the role of GO on the hydration process and chemical shrinkage of a cement paste through an experimental study and molecular dynamics simulation. The hydration heat flow of a cement composite with GO (CCG) was characterised by using an isothermal calorimeter. The chemical shrinkage of the CCG was also measured by applying a modified method based on ASTM C1608. The test results have shown that incorporating GO can mainly accelerate the hydration rate of cement composites at the early stage, but would not change the four-stage process of the cement hydration. The addition of GO by 0.3 wt% of cement is able to reduce the chemical shrinkage of the cement composites. This regulation effect is mainly attributed to the hydrogen bonding, which has been verified by the molecular dynamics simulation.

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Application of neutron imaging to investigate fundamental aspects of durability of cement-based materials: A review

Cited by 155 publications

References 95 publications

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Durability Studies on the Recycled Aggregate Concrete in China over the Past Decade: A Review

The Role of Graphene Oxide on the Hydration Process and Chemical Shrinkage of Cement Composites

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