Development of Technique for Observing Pores in Hardened Cement Paste

Tanaka, Kyoji; Kurumisawa, Kiyofumi

doi:10.3130/aijs.65.21_6

Cited by 7 publications

(14 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The test can also provide information about the connectivity of pores. Each pore size is quantitatively determined from the relation between the volume of intruded mercury and the applied pressure [30]. The relation between the estimated pore diameter and applied pressure is generally expressed by the Washburn equation, as in Eq.…”

Section: Fresh and Hardened States And Transport Properties Of Uhpcmentioning

confidence: 99%

The effect of nanosilica addition on flowability, strength and transport properties of ultra high performance concrete

Ghafari¹,

Costa²,

Júlio³

et al. 2014

Materials & Design

366

118

View full text Add to dashboard Cite

The experimental study herein presented was conducted aiming to evaluate the influence of nanosilica (nS) addition on properties of ultra-high performance concrete (UHPC). Thermo gravimetric analysis results indicated that nS consumes much more Ca(OH) 2 as compared to silica fume, specifically at the early ages. Mercury intrusion porosimetry measurements proved that the addition of nS particles leads to reduction of capillary pores. Scanning electron microscope observation revealed that the inclusion of nS can also efficiently improve the interfacial transition zone between the aggregates and the binding paste. The addition of nS also resulted in an enhancement in compressive strength as well as in transport properties of UHPC. The optimum amount of cement replacement by nS in cement paste to achieve the best performance was 3 wt.%. However, the improper dispersion of nS was found as a deterrent factor to introduce higher percentage of nS into the cement paste.

show abstract

Section: Fresh and Hardened States And Transport Properties Of Uhpcmentioning

confidence: 99%

The effect of nanosilica addition on flowability, strength and transport properties of ultra high performance concrete

Ghafari¹,

Costa²,

Júlio³

et al. 2014

Materials & Design

366

118

View full text Add to dashboard Cite

show abstract

“…Among them, nano-SiO 2 (NS) has received the most attention, and has been reported on intensively due to its pozzolanic reaction with portlandite, besides the filling effect. Recent experimental results have indicated that the application of nano-SiO 2 in cementitious systems can accelerate the cement hydration rate, refine pore structure, improve strength, and increase durability [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

“…With the addition of 3% nano-SiO 2 , the average compressive strength of mortar increased by 11.5%, 17.4%, 23.1%, 27.7% at 3 days, 7 days, 28 days and 90 days, respectively. From the results of the mercury intrusion porosimetry analysis, capillary pores were found to be smaller, and total porosity was also decreased by the addition of nano-SiO 2 [ 21 , 29 ]. Simultaneously, the refined pore structure reduced permeability considerably (such as the calcium leaching rate and chloride ion penetration), leading to improved durability [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano-SiO2 on the Early Hydration of Alite-Sulphoaluminate Cement

Sun

et al. 2017

Nanomaterials

View full text Add to dashboard Cite

The impact of nano-SiO2 on the early hydration properties of alite-sulphoaluminate (AC$A) cement was investigated with a fixed water to solid ratio (w/s) of one. Nano-SiO2 was used in partial substitution of AC$A cement at zero, one and three wt %. Calorimetry, X-ray diffraction (XRD), thermogravimetric/derivative thermogravimetric (TG/DTG), mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) analyses were used to characterize the hydration and hydrates of the blended cement. The hydration of the AC$A cement was significantly promoted, resulting in an increase of the heat released with the addition of nano-SiO2. Phase development composition analysis showed that nano-SiO2 had no effect on the type of crystalline hydration products of the AC$A cement. Moreover, nano-SiO2 showed significant positive effects on pore refinement where the total porosity decreased by 54.09% at three days with the inclusion of 3% nano-SiO2. Finally, from the SEM observations, nano-SiO2 was conducive to producing a denser microstructure than that of the control sample.

show abstract

“…Mercury intrusion porosimetry (MIP) technique is usually used to characterize the pore structure of cement‐based materials due to its simplicity, quickness and wide measuring range of pore diameter . Thus MIP is applied to test the pore structure of specimens in this research.…”

Section: Methodsmentioning

confidence: 99%

“…Mercury intrusion porosimetry (MIP) technique is usually used to characterize the pore structure of cement-based materials due to its simplicity, quickness and wide measuring range of pore diameter. 30,31 Thus MIP is applied to test the pore structure of specimens in this research. Each pore size is quantitatively determined by the relationship between the volume of intruded mercury and the applied pressure.…”

Section: Pore Structure Measurementmentioning

confidence: 99%

Dispersion characteristics of various contents of nano‐TiO₂ and its effect on the properties of cement‐based composite

Liu

Xiao

et al. 2018

Structural Concrete

View full text Add to dashboard Cite

Effect of nano‐TiO2 on the compressive strength and permeability of cement paste was studied, and the mechanism was revealed through investigating the hydration evolution and hydration products distribution of cement containing various contents of nano‐TiO2. Hydration Heat of cement, microstructure and pore structure of cement paste indicated that nano‐TiO2 could act as “nuclear” to accelerate the cement hydration, and this acceleration effect strengthened upon the nano‐TiO2 content at early age while reversed at long age. Distribution uniformity of nano‐TiO2 and hydration products was characterized and quantitative evaluated based on the method of energy dispersive X‐ray spectroscopy, which showed that the dispersion of nano‐TiO2 and hydration products had a high relativity, and the most uniform distribution was achieved at a small content of nano‐TiO2. The main effect of nano‐TiO2 on the properties of cement paste at early age and long age was the accelerated hydration and the improved distribution uniformity, respectively.

show abstract

Development of Technique for Observing Pores in Hardened Cement Paste

Cited by 7 publications

References 8 publications

The effect of nanosilica addition on flowability, strength and transport properties of ultra high performance concrete

The effect of nanosilica addition on flowability, strength and transport properties of ultra high performance concrete

Effect of Nano-SiO2 on the Early Hydration of Alite-Sulphoaluminate Cement

Dispersion characteristics of various contents of nano‐TiO₂ and its effect on the properties of cement‐based composite

Contact Info

Product

Resources

About

Development of Technique for Observing Pores in Hardened Cement Paste

Cited by 7 publications

References 8 publications

The effect of nanosilica addition on flowability, strength and transport properties of ultra high performance concrete

The effect of nanosilica addition on flowability, strength and transport properties of ultra high performance concrete

Effect of Nano-SiO2 on the Early Hydration of Alite-Sulphoaluminate Cement

Dispersion characteristics of various contents of nano‐TiO2 and its effect on the properties of cement‐based composite

Contact Info

Product

Resources

About

Dispersion characteristics of various contents of nano‐TiO₂ and its effect on the properties of cement‐based composite