Methods for Porosity Characterization of Cement Based Materials

2012 ◽  
Vol 1488 ◽  
Author(s):  
M.M. Canut ◽  
M. R. Geiker
Keyword(s):  
Pore Size ◽  
Pore Volume ◽  
Mercury Intrusion Porosimetry ◽  
Degree Of Hydration ◽  
Cement Based Materials ◽  
Porosity Estimation ◽  
Portland Cement Paste ◽  
Low Temperature Calorimetry ◽  
Porosity Characterization

ABSTRACTImportant pore structure parameters related to mechanical properties and durability of cement-based materials can be determined by techniques such as scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), and low temperature calorimetry (LTC). The methods provide information on porosity characteristics as pore volume, pore thresholds and/or pore size distribution in different size ranges and do therefore to a large extent supplement each other. Pastes of w/b=0.4 with 0%, 40% or 70% slag by volume were cured saturated at 20ºC for up to two years. The porosity was characterized by LTC, MIP, and SEM. Higher volume of pores was obtained by MIP compared to results obtained using LTC and SEM. Measured porosity was correlated with predicted porosity using information on the density and degree of hydration of the cement and slag. Porosity estimation showed best agreement with the porosity data measured by MIP. The use of slag showed the same trend for all tests: a higher total volume of pores, but a lower threshold pore size when compared with Portland cement paste. The findings illustrate the importance of measuring not only pore volume but also threshold pore sizes when characterizing porosity of cement-based materials with different binder compositions.

scholarly journals Sintesis Silika Mesopori Sba-15 Dari Abu Daun Jagung (Zea Mays L)

2017 ◽  
Vol 15 (1) ◽  
pp. 60
Author(s):  
Nasri Nasri ◽  
R R Dirgarini J. N Subagyono ◽  
Rahmat Gunawan
Keyword(s):  
Zea Mays ◽  
Mesoporous Silica ◽  
Pore Size ◽  
Pore Volume ◽  
Pore Diameter ◽  
Zea Mays L ◽  
Synthesis And Characterization ◽  
Template Method ◽  
Santa Barbara

The synthesis and characterization of  mesoporous silica Santa Barbara Acid-15 (SBA-15) from the ash of corn have been done.  SBA-15 was synthesised using the surfactant template method. SBA-15 from corn leaves  ash has a surface area of 592 m2 / gram, pore volume of 0.99 cm3 / gram and pore diameter of 3.95 nm with pore size ranging from 4.9 nm - 7.1 nm. The SAXS pattern of the bio-SBA-15 showed three typical peaks of SBA-15 with miller indices [100], [110] and [200]. In the FTIR spectrum of  SBA-15, peaks from Si-O-Si, Si-OH and H-O-H from water were observed.  

scholarly journals Enhanced pore space analysis by use of μ-CT, MIP, NMR, and SIP

2018 ◽  
Author(s):  
Zeyu Zhang ◽  
Sabine Kruschwitz ◽  
Andreas Weller ◽  
Matthias Halisch
Keyword(s):  
Pore Size ◽  
Pore Volume ◽  
Pore Space ◽  
Volume Distribution ◽  
Micro Computed Tomography ◽  
Pore Size Distributions ◽  
Scale Characterization ◽  
Relevant Range ◽  
Good Agreement

Abstract. We investigate the pore space of rock samples with respect to different petrophysical parameters using various methods, which provide data upon pore size distributions, including micro computed tomography (μ-CT), mercury intrusion porosimetry (MIP), nuclear magnetic resonance (NMR), and spectral induced polarization (SIP). The resulting cumulative distributions of pore volume as a function of pore size are compared. Considering that the methods differ with regard to their limits of resolution, a multiple length scale characterization of the pore space geometry is proposed, that is based on a combination of the results from all of these methods. The approach is demonstrated using samples of Bentheimer and Röttbacher sandstone. Additionally, we compare the potential of SIP to provide a pore size distribution with other commonly used methods (MIP, NMR). The limits of resolution of SIP depend on the usable frequency range (between 0.002 Hz and 100 Hz). The methods with similar resolution show a similar behavior of the cumulative pore volume distribution in the overlapping pore size range. We assume that μ-CT and NMR provide the pore body size while MIP and SIP characterize the pore throat size. Our study shows that a good agreement between the pore radii distributions can only be achieved if the curves are adjusted considering the resolution and pore volume in the relevant range of pore radii. The MIP curve with the widest range in resolution should be used as reference.

scholarly journals Experimental Investigation of the Macroscopic Behavior and Microstructure Property Evolution of Hardened Cement Consolidated Tailings

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 6 ◽  
Author(s):  
Xiang Sun ◽  
Yunbing Hou
Keyword(s):  
Compressive Strength ◽  
Pore Size ◽  
Pore Volume ◽  
Mercury Intrusion Porosimetry ◽  
Mining Industry ◽  
Total Pore Volume ◽  
Hardened Cement ◽  
Curing Period ◽  
Strength Tests ◽  
Curing Age

Surface cement consolidated tailings disposal has recently been proposed to manage tailings in the modern mining industry because it can reduce or eliminate the disadvantages of traditional tailings storage. In this study, the evolution of the macro performance and microstructure characteristics of cement consolidated tailing samples during the curing period were determined by unconfined compressive strength tests, permeability tests, scanning electron microscopy (SEM) observations, and mercury intrusion porosimetry (MIP) tests, respectively. The results show that the curing time notably affected the macro performance and microstructural properties of the hardened cement consolidated tailings samples. As the curing age increases, the compressive strength increases nonlinearly and the growth rate decreases; the permeability decreases rapidly first, then gradually stabilizes, and finally reaches a stable value; the morphology of the hydration products and microstructures continues to evolve with the hydration process; the total pore volume decreases slightly, whereas the critical pore size decreases significantly. The proportion of the pore volume in different pore size ranges can also be affected by the curing age, which results in a large pore (>200 nm) decrease, and the small pores (<200 nm) increased. In this process, the filling effect plays a major role.

Pore Structure Of Hydrated Cement Determined By Mercury Porosimetry And Nitrogen Sorption Techniques.

1988 ◽  
Vol 137 ◽  
Author(s):  
Yahia Abdel-Jawad ◽  
Will Hansen
Keyword(s):  
Pore Structure ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Pore Volume ◽  
Mercury Porosimetry ◽  
Total Pore Volume ◽  
Curing Temperature ◽  
Vycor Glass ◽  
Degree Of Hydration

AbstractThe pore structure (i.e. total pore volume, surface area and pore-size distribution curves) was measured using mercury porosimetry and nitrogen sorption. Hydrated portland cement (type I) of water-cement (w/c) ratios 0.3, 0.4 and 0.6 by weight was analyzed at three degrees of hydration (i.e., 30%, 50% and 80%; 70% for the 0.3 w/c system) corresponding to low, intermediate and high levels of hydration. The effect of curing temperature (3°, 23°, and 43°C) on pore structure was also studied. The two techniques were evaluated as well on porous Vycor glass, which has a narrow pore size distribution in the size range accessible to both. Results obtained by both techniques on porous Vycor glass agreed well. However neither technique can be used alone to study the entire pore structure in well-hydrated cement due to the wide range in pore sizes and the presence of micropores. Due to the unstable pore structure in cement a specimen treatment procedure such as methanol replacement, combined with volume-thickness (V-t) analysis, is necessary in order to measure the micropores. At low hydration values the pore structure can be estimated by mercury intrusion porosimetry (MIP). At higher hydration values, however, this technique underestimates total pore volume and surface area due to the presence of micropores which MIP cannot determine. In the pore size range of overlap, higher pore volumes were obtained with MIP. Nitrogen V-t analysis shows that micropores are more pronounced with lower w/c ratios. This finding is consistent with pore size distribution curves obtained by MIP. For a given w/c ratio and degree of hydration the total pore volume measured by MIP was found to be independent of curing temperature in the temperature range studied. At any w/c ratio, capillary porosity is controlled by degree of hydration alone.

Characterization of Porous Calcium Phosphate Bioceramics Modified by Porosifier

2007 ◽  
Vol 336-338 ◽  
pp. 1618-1621
Author(s):  
Li Gou ◽  
Shun Qiao Cheng ◽  
Jun Guo Ran ◽  
Bao Hui Su
Keyword(s):  
Calcium Phosphate ◽  
Bone Formation ◽  
Porous Structure ◽  
Pore Size ◽  
Animal Experiment ◽  
Mercury Intrusion Porosimetry ◽  
Mercury Intrusion ◽  
Healthy Dogs

The porous structure of calcium phosphate ceramics is one of the essential conditions resulting in bone formation. The porous structure of biphasic HA/β-TCP ceramics was improved by adding microporous porosifer and the porous characteristics such as porosity, pore size and pore size distribution were determined by the mercury intrusion porosimetry, the cell culture in vitro and the animal experiment. By means of SEM and fluorescence decoration, cells were observed firstly attaching the edge of macropores of specimens and the wall of the macropores with micropores when co-cultured with HA/β-TCP ceramics. The specimens were also implanted in dorsal muscles of healthy dogs for 1.5and 3 months. More bone formation in the specimen with microporous porosifer was found by histological observation after taking out. It suggested that the micropores in the walls of macropores of bioceramics had important effect upon their osteoinduction.

Characterization of Pore Structure of Hardened Cement-Asphalt Paste by Mercury Intrusion Porosimetry

2014 ◽  
Vol 1004-1005 ◽  
pp. 1589-1593 ◽  
Author(s):  
Sheng Zhang ◽  
Xi Ling Zhou ◽  
Ke Ren Zheng ◽  
You Jun Xie ◽  
Qiang Fu
Keyword(s):  
Pore Structure ◽  
Pore Size ◽  
Mercury Intrusion Porosimetry ◽  
Total Porosity ◽  
Pore Distribution ◽  
Hardened Cement ◽  
Volume Distribution ◽  
Mercury Intrusion ◽  
Two Peaks

To know the pore structure of cement-asphalt pastes, mercury intrusion porosimetry was applied to measure the total porosity, pore distribution and accumulative volume distribution of pore size and the pore structures were analyzed. The results show that the total porosities decline with increase in ages and reduction in A/C ratio. The total porosities declines from 28% at 1d, to 15.8%~17.2% at 28d; the most probable pore size declines from 20nm at 1d to 5nm at 28d.At 28d, there is an increase in the magnitude of pore size between100nm and 5μm; the volume faction of smaller than 5μm is 40~50%; and the amount of pore size smaller than 5nm account for 6%.There are two peaks (5μm & 50μm) in the curves of pore distribution.

Characterization of Hemophan Hemodialysis Membranes by Thermoporometry

1992 ◽  
Vol 15 (1) ◽  
pp. 25-28 ◽  
Author(s):  
A.P. Broek ◽  
D. Bargeman ◽  
E.D. Sprengers ◽  
C.A. Smolders
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Pore Volume ◽  
Pore Radius ◽  
Artificial Kidney ◽  
Membrane Characterization ◽  
Treated Sample ◽  
Glycerol Treatment

A new wet-state membrane characterization method, thermoporometry, was used to study the effect on membrane structure of commonly used sterilization methods for artificial kidney membranes. The porosity and pore size distribution of differently sterilized hollow fiber Hemophan hemodialysis membranes were determined. Also the effect of a glycerol treatment (before sterilization) on porosity and pore size distribution after sterilization was studied. Hemophan was found to have a pore size distribution of pores with radii between 1.5 and 12 nm. Most of the samples had a maximum pore volume at a pore radius of 2.5 nm, only the steam sterilized and non glycerol treated sample had a maximum pore volume at 1.5 nm. The porosity was found to vary between 14 and 31% and was dependent on the applied treatment

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