# on the correlation between porosity and strength in high

### Example of CorrelationMinitab

As hydrogen content increases strength tends to decrease. The Pearson correlation coefficient between porosity and strength is −0.527 and the p-value is 0.053. The p-value is close to the significance level of 0.05 which provides inconclusive evidence for the association between porosity and strength.

Get Price### Regression on porosity-strength relationship of select

indicates that porosity can predict 72 of the variance in strength. However the statistical significance of this is still questionable With a lower n your chances of getting a relationship with a high r-squared value by accident are increased. The above plot shows the z

Get Price### Relationship between Porosity Strength of Concrete

Sep 13 2017 · Relationship between Porosity Strength of Concrete Anonymous September 13 2017 Porosity can be defined as the total volume of the overall volume of the pores larger than the gel pores expressed as a percentage of the overall volume of the cement paste. The effects of pores smaller than 20mm in diameter were found to be negligible.

Get Price### ACARP Abstract

Porosity was found to have a major influence on coke strength which suggests that coke textures play only a minimal role in determining coke strength. There was only a general trend that indicated that there is a minimum in porosity corresponding to the optimum Ro max for maximum pre reactivity coke strength.

Get Price### Research into the correlation between concrete strength

The concrete cube strengths varied between 5.0 and 55.0 MPa. A correlation is set up so as to find strength-UPV relationship between the data from the earlier laboratory researches and the best fit-curve representing the relationship is given as S Lab = 0.0872e 1.29VLab.

Get Price### Compressive strength of rocksPetroWiki

Jun 04 2015 · The high-porosity (33 ) sandstone (Fig. 4a) has a low "crush" strength of about 55 MPa. With a lower porosity of 19 Berea sandstone has a much higher strength of 440 MPa (Fig. 4b). Notice that in both Figs. 4a and 4b permanent deformation remains even after the stress is released. This hysteresis demonstrates the damage to the matrix

Get Price### The relationship between porosity and strength for porous

The relation between porosity and permeability of concrete was developed empirically by experiment (Breysse and Gérard 1997). The porosity is a function of compressive strength (Lian et al.

Get Price### Pore water pressureWikipedia

Pore water pressure (sometimes abbreviated to pwp) refers to the pressure of groundwater held within a soil or rock in gaps between particles ().Pore water pressures below the phreatic level of the groundwater are measured with piezometers.The vertical pore water pressure distribution in aquifers can generally be assumed to be close to hydrostatic.. In the unsaturated ("vadose") zone the

Get Price### Compressive strength of rocksPetroWiki

Jun 04 2015 · The high-porosity (33 ) sandstone (Fig. 4a) has a low "crush" strength of about 55 MPa. With a lower porosity of 19 Berea sandstone has a much higher strength of 440 MPa (Fig. 4b). Notice that in both Figs. 4a and 4b permanent deformation remains even after the stress is released. This hysteresis demonstrates the damage to the matrix

Get Price### CONCRETE MICROSTRUCTURE POROSITY AND

the physical or mechanical property influenced by the distribution in porosity it may be beneficial to consider the pore structure in terms of pore surface areas or pore numbers. For example the Kozeny-Carman relationship relates permeability to porosity K e3/(1e)2/ 2 where e is the total porosity and S is the total surface area of the

Get Price### Permeability‐porosity relationship A reexamination of the

Jan 31 2006 · 1 The relationship between permeability and porosity is reviewed and investigated. The classical Kozeny‐Carman approach and a fractal pore‐space geometry assumption are used to derive a new permeability‐porosity equation. The equation contains only two fitting parameters a Kozeny coefficient and a fractal exponent.

Get Price### Reservoir qualityAAPG Wiki

Jan 23 2019 · Because lithology porosity and fluid saturations affect the acoustic impedance of a rock a relationship can then be established between the seismic estimates of impedance and the rock properties determined from the logs or in the laboratory. (For information on comparing seismic data to rock properties see Seismic inversion.)

Get Price### Compressive strength of rocksPetroWiki

Jun 04 2015 · The high-porosity (33 ) sandstone (Fig. 4a) has a low "crush" strength of about 55 MPa. With a lower porosity of 19 Berea sandstone has a much higher strength of 440 MPa (Fig. 4b). Notice that in both Figs. 4a and 4b permanent deformation remains even after the stress is released. This hysteresis demonstrates the damage to the matrix

Get Price### Soil Structure Density Porosity

Porosity (pores are weightless) Organic Matter Typical 1-5 organic matter Mineral Soil bulk density = 1.1 –1.6 g/cm3 Organic Soils > 20 organic matter bulk density = 0.10.6 g/cm3 Factors Affecting Bulk Density Texture and Aggregation One sand grain One aggregate of Clay sized particles (Zero porosity) (50 porosity) Particle size

Get Price### Relationship between tensile strength and porosity for

Relationship between tensile strength and porosity for high porosity metals Liu Peisheng Fu Chao Li Tiefan Shi Changxu Abstract. Publication Science in China E Technological Sciences. Pub Date February 1999 DOI 10.1007/BF Bibcode 1999ScChE..42..100L full text sources

Get Price### Reservoir qualityAAPG Wiki

Jan 23 2019 · Because lithology porosity and fluid saturations affect the acoustic impedance of a rock a relationship can then be established between the seismic estimates of impedance and the rock properties determined from the logs or in the laboratory. (For information on comparing seismic data to rock properties see Seismic inversion.)

Get Price### Pore structure and compressive property of high porosity

Jul 24 2019 · Degischer reported an inverse relationship between the strength and porosity of metal foam pointing out that increasing the porosity of aluminium foam inevitably reduces its strength 33 . Wang et al 34 suggested a method to strengthen polyurethane aluminium foam using compounding glass beads and glass fibers.

Get Price### Correlation between pore structure compressive strength

Jun 30 2020 · The degree of porosity controls the mechanical strength and thermal conductivity of the geopolymer foam. The amount of porosity in the range of 50–95 was required in order to achieve lightweight and thermal insulating properties.

Get Price### Empirical relations between rock strength and physical

• Porosity (ϕ) which is usually derived from density measurements assuming rock matrix and fluid densities. Conceptually the justification for the empirical relations discussed below is the general correlation between these parameters and unconfined compressive strength. These general correlations are seen in the

Get Price### Regression on porosity-strength relationship of select

indicates that porosity can predict 72 of the variance in strength. However the statistical significance of this is still questionable With a lower n your chances of getting a relationship with a high r-squared value by accident are increased. The above plot shows the z

Get Price### Relation of Hardness to Mechanical Properties Tensile Strength

A correlation may be established between hardness and some other material property such as tensile strength. Then the other properties (such as strength) may be estimated based on hardness test results which are much simpler to obtain. low porosity high creep and since toughness decreases as hardness increases Toughness is a

Get Price### Permeability‐porosity relationship A reexamination of the

Jan 31 2006 · 1 The relationship between permeability and porosity is reviewed and investigated. The classical Kozeny‐Carman approach and a fractal pore‐space geometry assumption are used to derive a new permeability‐porosity equation. The equation contains only two fitting parameters a Kozeny coefficient and a fractal exponent.

Get Price### The effect of porosity on the strength of foamed concrete

Feb 01 2002 · Effect of porosity on compressive strength. The relationship between measured porosity and the compressive strength (after 1 year) of foamed concrete is shown in Fig. 2. From this graph it can be seen that the relationship is not significantly influenced by the use of pfa or pozz-fill.

Get Price### Relationship between soil cohesion and shear strength

RELATIONSHIP BETWEEN SOIL COHESION AND SHEAR STRENGTH Hajime YOKOI National lnsfltute of Agricultural Sciences Tokyo Japan RECEIVED NOVEMBER 6 1967 Introduction Cohesion of soil is an important factor of soil consistency. The word cohesion however has acquired two connotations. In soil physics

Get Price### Models for Strength Prediction of High-Porosity Cast-In

Jan 01 2018 · Odler and Roller 7 established a relationship between porosity and strength for a series of cement pastes with different water/cement ratios after periods of hydration. The research showed that the relationship between the compressive strength and the porosity is linear for porosity values between 5 and 28 .

Get Price### Research into the correlation between concrete strength

The concrete cube strengths varied between 5.0 and 55.0 MPa. A correlation is set up so as to find strength-UPV relationship between the data from the earlier laboratory researches and the best fit-curve representing the relationship is given as S Lab = 0.0872e 1.29VLab.

Get Price### CONCRETE MICROSTRUCTURE POROSITY AND

the physical or mechanical property influenced by the distribution in porosity it may be beneficial to consider the pore structure in terms of pore surface areas or pore numbers. For example the Kozeny-Carman relationship relates permeability to porosity K e3/(1e)2/ 2 where e is the total porosity and S is the total surface area of the

Get Price### 4.4 Electrical conductivity of minerals and rocks

Reasonable ranges for porosity and pore fluid resistivity yield a range of bulk rock resistivities of almost five orders of magnitude. Archie actually began his work hoping to find a relationship between permeability and resistivity. Figure 4.4.3 is a page from one of his early papers showing resistivity vs. both permeability and porosity.

Get Price### Properties of RefractoriesIspatGuru

Dec 16 2016 · Porosity and densityLow porosity of the refractory brick is desirable since it improves the mechanical strength and other properties of the refractories. True porosity of a refractory brick is the ratio of the total pore space (i.e. open and closed pores)

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