Quantifying the anomalous water absorption behavior of cement mortar in view of its physical sensitivity to water

Ren, Fangzhou; Zhang, Chunsheng; Zeng, Qiang; Zhang, Zhidong; Angst, Ueli; Wang, Wei

doi:10.1016/j.cemconres.2021.106395

Cited by 46 publications

(18 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…to describe the deviated water absorption [158,[163][164][165], but more information is needed on the kinetics of internal swelling and time-dependent transport properties of water in CBMs.…”

Section: Deviation From the Srt Lawmentioning

confidence: 99%

“…When evaluating durability of CBMs, initial water sorptivity is no longer appropriate without considering the effect of water sensitivity. Because secondary sorptivity is linked to stabilized water permeability [158,165] and changes predictably with temperature [156], it would be better at quantifying water transport in CBMs. Further research is needed to understand the influence of water sensitivity on both initial and secondary sorptivity for CBMs.…”

Section: Accepted Articlementioning

confidence: 99%

“…Physical swelling of C‐S‐H gels and evolving pore structure necessitate time‐dependent water transport properties. Several physical models have been proposed to describe the deviated water absorption, 158,163–165 but more information is needed on the kinetics of internal swelling and time‐dependent transport properties of water in CBMs.…”

Section: Detailed Connotations Of Water Sensitivitymentioning

confidence: 99%

See 2 more Smart Citations

Water sensitivity of cement‐based materials

Zhang

Wang

et al. 2021

J Am Ceram Soc

Self Cite

View full text Add to dashboard Cite

Cement-based materials are the most widely used construction materials on the planet. Cementbased materials play a fundamental role in modern civilization and will for the foreseeable future.Although great efforts have been devoted to discovering the behaviors and optimizing their performances, several long-standing controversies persist for the fundamental water-related properties of cement-based materials, which hinder theoretical researches and mislead technological developments. Inspired by the decreasing water permeability of clay-bearing rocks, the term "water sensitivity" in geophysics is borrowed and proposed for cement-based materials. The lamellar structure of negatively charged nanoparticles is responsible for swelling in clay-based reservoir rocks. Amorphous calcium silicate hydrate gels in cement-based materials have similar microstructural characteristics. They probably swell upon wetting and contract upon drying, making the pore structure of cement-based materials dependent on water content. More importantly, several unexplained behaviors of cement-based materials can be rationalized using water sensitivity.Thorough exploration of both the micro-structural characteristics and performances validate the use of water sensitivity for cement-based materials. Because water participates in or regulates almost all physical and chemical processes of cement-based materials, water sensitivity can be a part of the interpretations of almost all of their properties and performances.

show abstract

Section: Deviation From the Srt Lawmentioning

confidence: 99%

Section: Accepted Articlementioning

confidence: 99%

Section: Detailed Connotations Of Water Sensitivitymentioning

confidence: 99%

See 1 more Smart Citation

Water sensitivity of cement‐based materials

Zhang

Wang

et al. 2021

J Am Ceram Soc

Self Cite

View full text Add to dashboard Cite

show abstract

“…As shown in the study by Zhang et al [24] the capillary absorption coefficient of ordinary concrete increases due to the increase in the number of capillary pores under the effect of freeze-thaw cycles, and this change is lower for concrete with a low waterbinder ratio than concrete with a high water-binder ratio under the same conditions. Ren et al [25] reported that the water sensitivity of C-S-H gel was the main explanation for the two-stage capillary water absorption effect in cement-based materials. Baricevic et al [26] proposed that the addition of fibers to concrete would block capillary pores, reduce pore connectivity, and decrease the capillary water absorption coefficient.…”

Section: Introductionmentioning

confidence: 99%

Factors Influencing the Capillary Water Absorption Characteristics of Concrete and Their Relationship to Pore Structure

Wang

Liu

et al. 2022

Applied Sciences

View full text Add to dashboard Cite

The capillary absorption capacity exerts an important effect on the durability of cement-based materials and is closely related to the pore structure. In this study, a variety of cement-based specimens were examined. The capillary water absorption and pore structure of the samples were determined using a gravimetric method and mercury intrusion porosimetry (MIP), respectively. The capillary water absorption coefficients for different water–binder ratios, diverse types and dosages of mineral admixtures, and various preloads were measured. The experimental results were analyzed and compared with data available in the current literature. The test results showed that the capillary water absorption performance of cement-based materials increased with an increasing water–binder ratio, first decreased and then increased with an increasing fly ash dosage, decreased with an increasing mineral power dosage, and decreased when the preload was less than a critical value and increased rapidly when the preload was greater than the critical value. The relationship between the capillary absorption coefficient and porosity was nearly linear. Water absorption by cement-based materials mainly correlated with pore diameters in the range of 10~1000 nm. The capillary water absorption coefficient increased continuously with the increase of pore fractal dimension.

show abstract

“…[15,16] The current approaches in the literature considering the microstructural effect on moisture transport is directly to write k l as a function of time, in which, the theory is that transport coefficients are directly related to materials' microstructure and the change microstructure is also a function of time; this group is known as the time-dependent models. [17][18][19][20] Another group considers the different transport speeds of moisture in different sizes of pores, so-called dual-permeability models. [21] Both of them can provide high accuracy simulation results.…”

Section: Introductionmentioning

confidence: 99%