What is the Process of Slacking

Slaking

slaking tests show that the rocks of the pillar disintegrate into pocket-sized flakes later on but one or two cycles of wetting and drying.

From:

Treatise on Geomorphology
,
2013

Weathering and Soils Geomorphology

D.
Mottershead
, in


Treatise on Geomorphology, 2013

four.xiii.three.1.two

Slaking


Slaking
is the procedure of alternate wetting and drying. Rocks, especially those containing clays, tend to bully on wetting, with subsequent contraction on drying. When h2o enters the pores of a stone, the rock dilates, creating tensile stresses and generating tension cracks (

Yatsu, 1988). The consequent development of microcracks and their propagation farther increase porosity.

Wetting/drying sequences necessarily occur in the littoral zone, notably on shore platforms during tidal cycles, but also above high h2o mark through episodic wetting by wave splash during heavy seas and by rainfall. Such repeated expansion/contraction sequences are likely to impose stresses on coastal rocks. Experiments indicate that slaking is capable of producing rock breakup, and also show that saltwater may be more or less constructive than pure water in slaking, depending on the stone type.

Laboratory studies of slaking have been carried out past
Hall and Hall (1996)
and
Kanyaya and Trenhaile (2005), using deionized water to eliminate the result of salt. The former showed slaking to cause mass loss of the rock, and that water uptake increased during the procedure, interpreted as indicating pore enlargement; the latter showed that maximum water content tin can be achieved very rapidly and, chiefly, that the effectiveness of slaking is governed past the length of the drying cycle and whether it is immune to run its full course before a subsequent wetting phase.

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Mountain and Hillslope Geomorphology

Y.
Matsukura
, in


Treatise on Geomorphology, 2013

7.4.4.1

Effect of Slaking on Rock-Controlled Landforms


Slaking
has been identified as a cause of rock-controlled landforms (differential erosion landforms) such as cuestas and hoodoos. The meaning papers by

Suzuki et al. (1970, 1972)
and
Takahashi (1975)
attributed the differential erosion of wave-cutting benches in the intertidal zone along several coasts in Japan (Effigy 5) to the difference in swelling potentials of shale (mudstone) and tuff or sandstone. The rocky declension of Arasaki, SW of Tokyo, is underlain past a steeply dipping rhythmic amending of mudstone and tuff. Erosion proceeds differently between the two rocks with altitude. On the benches, mudstone forms the furrows and tuff forms ridges, producing a washboard-like relief with a acme-to-trough peak of nigh 1.half dozen
 
m. Field and laboratory tests on fresh samples of both rocks revealed that the mudstone is mechanically more erosion resistant than tuff (Tabular array ane). The mudstone is stronger than the tuff and suffers less abrasion loss. However, the mudstone is easily jointed to form fragments of about one
 
cm by moisture–dry slaking, whereas the tuff is not. The mean joint spacing on the mudstone surface is most a abiding ane
 
cm above an altitude of 1.v
 
m; below this level, information technology increases because fragments of mudstone formed by wet–dry slaking are ofttimes and rapidly done abroad past waves. These observations bespeak that differential erosion results non but from differences in lithology and mechanical strength merely as well from dissimilarity in the response of rocks to the distinctive geomorphological processes at various altitudes. Furthermore, weathering of the rock is significant as a procedure that facilitates erosion and mass motion. Like conclusions arise from studies of microrelief on wave-cut benches in other areas (due east.yard.,
Takahashi, 1975, 1976).
Yatsu’south (1966, 1971)
concept of rock control is clearly substantiated on the Arasaki declension, based on quantitative data for rock properties and their response to erosive agents acting on the rocks.


Figure v.
(a) Panoramic view taken at the low tide: Mudstone forms shallow furrows, and sandstone forms the ridges on the wave-cutting benches producing a washboard-like relief with an amplitude of near twoscore
 
cm at Aoshima Island, Nichinan coast in Japan. (b) Closeup view: The fragments of mudstone produced by wet–dry slaking are rapidly washed away past waves in the intertidal zone.




Table 1.
Physical and mechanical properties of mudstone and tuff from Arasaki declension, Japan


Rock properties Mudstone Tuff
Physical Apparent density two.64 2.63
Porosity (%) 39.three 34.0
Coefficient of thermal linear expansion (x−6/°C) six.half-dozen 4.iv
Longitudinal wave velocity (km
 
s−ane)
wet two.0 i.3
Mechanical Compressive force (Mpa) dry 23.5 17.0
wet 1.4 0.8
Tensile strength (Mpa) dry out iv.3 1.5
wet 0.vi 0.5
Shear strength (Mpa) dry 7.4 iii.0
Chafe loss by Loss Angeles test (%/100 rounds) dry vii.2 15.0
wet 13.0 33.0

Source: Adapted from Suzuki, T., Takahashi, K., Sunamura, T., Terada, Thou., 1970. Rock mechanics on the germination of washboard-like relief on wave-cut benches at Arasaki, Miura Peninsula, Nihon. Geographical Review of Nihon 43, 211–222.

Tanaka et al. (1996)
examined the formation of mushroom-shaped rocks known every bit ‘pedestal rocks’ or ‘hoodoos’ in the Drumheller badlands, Alberta, Canada, by measuring rock properties in the field and laboratory. They found that the formation of hoodoos is controlled mainly by the susceptibility of the stone to wet–dry out slaking, equally follows. Hoodoos are equanimous of three types of Cretaceous sedimentary rocks, two kinds of sandstone and siltstone. Each hoodoo was divided morphologically into two parts, the caprock and the colonnade (Figure 6). The morphological characteristics of hoodoos involve differences in rock type: the caprock is made of sandstone with a high resistance to slaking, and the colonnade is made of both sandstone and siltstone with a lower resistance to slaking (Effigy vii); slaking tests show that the rocks of the pillar disintegrate into modest flakes after only one or two cycles of wetting and drying. The difference in susceptibility to slaking of these rock types derives from the combination of pore-size distribution and dirt mineral composition. Rocks of the colonnade accept loftier clay fraction (xx–xxx%), a large value of the specific area (11–21
 
mii
g–one), and interstratified illite/smectite with large expansion from 12.five to 17.7
 
Å. The landform development of hoodoos is speculated to be equally shown in
Effigy 8.


Figure 6.
Typical example of hoodoos, which are made of three types of sedimentary rocks, such as Cf-, Pf-, and Ps-layers: Cf is cap stone composed of fine sandstone, Pf is colonnade rock equanimous of fine sandstone, and Ps is pillar rock composed of alternate white and brown siltstone thin beds. Reproduced from Tanaka, Y., Hachinohe, S., Matsukura, Y., 1996. The influence of slaking susceptibility of rocks on the germination of hoodoos in Drumheller Badlands, Alberta, Canada. Transactions of the Japanese Geomorphological Union 17, 107–121.




Figure 7.
Disintegration curves equally a event of slaking tests for the samples. Cf, Pf, and Ps, respectively, denote caprock fine sandstone, colonnade fine sandstone, and colonnade siltstone. Reproduced from Tanaka, Y., Hachinohe, S., Matsukura, Y., 1996. The influence of slaking susceptibility of rocks on the germination of hoodoos in Drumheller Badlands, Alberta, Canada. Transactions of the Japanese Geomorphological Marriage 17, 107–121.




Figure viii.
Formation of hoodoos in Drumheller badlands.


(a) and (b) Stage i: Cf and Pf layers are sculptured into a rectangular pattern of gullies. (c) Stage 2: Slopes composed of Pf and Ps are eroded laterally by slaking more severely than those of Cf. Flakes made by slaking pare away through the activity of pelting or wind. (d) Stage 3: Progression of lateral erosion of pillars makes Hoodoos. Reproduced from Tanaka, Y., Hachinohe, South., Matsukura, Y., 1996. The influence of slaking susceptibility of rocks on the formation of hoodoos in Drumheller Badlands, Alberta, Canada. Transactions of the Japanese Geomorphological Union 17, 107–121.

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The Role of Piping in the Development of Badlands

Hazel
Faulkner
, in


Badlands Dynamics in a Context of Global Change, 2018

three.1.2

Discontinuous Rills Developing in Subcrust Positions With Semicircular Cross Sections and Bridges

Early inquiry on chemic
slaking
and rill development was undertaken by

Gerits et al. (1987), Imeson and Verstraten (1988), Bradford and Huang (1992)
and
Benito et al. (1993).
Kasanin-Grubin and Bryan (2007)
investigated the geometric and geochemical backdrop of three plots with well-adult rills in badland materials of dispersive mudrock in 2001 and once again in 2003. In the 2
 
year catamenia, width/depth ratios decreased on these rill networks and the ‘popcorn’ chaff changed to a thin less dispersive signature (sodium and calcium concentrations dropped). These findings back up the findings of
Faulkner et al. (2004), who from similar material analyses across a rill network institute that sodium can hands be translocated to a subsoil position, enhancing the development of shallow subsurface pipes which collapse into rills (Fig. 6.5A). Tillage lines may provide the initial focus (Fig. 6.5B). It could be this consequence, combined with a down-profile permeability gradient that is deflecting infiltrating flows and allowing shallow subcrust pipage development in the biancana badlands of Italy (Torri et al., 1994; Torri and Bryan, 1997).


Figure 6.5.
(A) Discontinuous rills with ‘mini-bridges’. (B) Discontinuous crusted rill with head cut, aligned to tillage.


Images from Faulkner (2013).

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Concrete and Biological Surface Crusts and Seals

Amanda J.
Williams
, …
Georges
Stoops
, in


Interpretation of Micromorphological Features of Soils and Regoliths (2nd Edition), 2018

2.1.1.ane

Disruptional Microlayer

The disruptional microlayer forms through
slaking, due to pinch of entrapped air or dispersion of dirt, producing a dense layer at the soil surface. This microlayer is 100
 
μm to 6
 
mm thick (Arshad & Mermut, 1988) and shows no internal layering (Bresson & Valentin, 1994). The disruptional layer has a smaller aggregate size than the underlying soil, and it has a porosity that is 30 to 60% lower (Chiang et al., 1994).

In strongly aggregated soils, the disruptional microlayer forms slowly and is initially recognised past the presence of newly formed modest aggregates that bind the original larger aggregates together. In weakly aggregated soils, discrete micromass material quickly fills interpedal voids (Cousin et al., 2005). In early on stages of germination, particles are oriented parallel to the surface (Luk et al., 1990). In sandy soil materials, coatings of fine particles on fibroid grains are quickly removed, leaving uncoated grains (Chen et al., 1980; Tarchitzky et al., 1984). For granite-derived soils,
Moss (1991a, 1991b)
observed the formation of a silt layer on the soil surface, overlying a compacted layer. Other authors draw small depressions resulting from raindrop impact (east.1000.,
Slattery & Bryan, 1994; Zhao et al., 2015), or minor protrusions (Slattery & Bryan, 1992).

The c/f-related distribution pattern and the b-fabric of the disruptional microlayer depend on the soil cloth affected. The m1 microhorizon of
Bresson and Boiffin (1990)
is a discontinuous disruptional microlayer showing moderate to weak ped separation,
whereas the overlying m2 microhorizon corresponds to a more continuous, apedal microlayer, and the m3 microhorizon is a local sedimentary surface.

The susceptibility of soils to slaking and formation of the disruptional microlayer are determined by soil texture, organic thing content, mineralogical composition of the clay fraction, cation saturation, and Iron and Al hydroxide content (see
Le Bissonnais, 1996; Amézketa, 1999). Medium-textured soils with <twenty% dirt are susceptible to slaking, and swelling clays such as smectite are more prone to chaff formation than kaolinitic materials (e.g.,
Mermut et al., 1995). Clay dispersion is favoured by high exchangeable Na contents, whereas Atomic number 26 and Al hydroxides take a stabilising effect (see
Le Bissonnais, 1996).

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Mount and Hillslope Geomorphology

E.50.H.
Cammeraat
, in


Treatise on Geomorphology, 2013

vii.33.3.one

Soil-Surface Sealing and Crusting

Soil-surface sealing is an of import process on semiarid hillslopes.
Slaking
of soil surface components, such as aggregates, strongly reduce h2o infiltration. The type of crusts associated with this procedure is more often than not described equally a structural crust (e.grand.,

Valentin and Bresson, 1992). The evolution of a soil-surface chaff upon soil structural decline by slaking and welding processes is dependent on initial conditions of the soil with regard to moisture (e.g.,
Le Bissonnais and Vocaliser, 1992) and fifty-fifty more so to the soil chemic properties, of which soil organic matter seems to exist most of import. Non only the amount of organic matter is important but also its disposition (Tisdall and Oades, 1982; Graham et al., 1995; Half dozen et al., 2004). Yet, other soil constituents besides are important such as clay content, carbonates and other salts, iron and aluminum oxides, as well equally soil roots and other biota (Emerson, 1983; Bronick and Lal, 2005). Soils in semiarid environments more often than not take low organic matter contents (Vocalist and Le Bissonnais, 1998), which is related to the low biomass production in such ecosystems. Soil organic matter levels in the soil are besides dependent on annual rainfall, and straight affect soil aggregate stability and, therefore, erodibility of the soil (Lavee et al., 1998; Sarah, 2006).
Lavee et al. (1998)
showed that a articulate threshold-like drop exists in organic matter and soil structural stability under semiarid conditions with respect to subhumid Mediterranean and barren desert environments.
Casenave and Valentin (1992)
showed that runoff generation in the Sahelian zone was strongly influenced past the blazon of crusts present on soil surfaces. They distinguished several types of crusts (structural crusts, erosion crusts, and depositional crusts) with unlike runoff responses, depending on landscape and land apply. Comparable types of chaff for furrows and ridges on abandoned fields showing strongly reduced infiltration rates also are recorded from Mediterranean drylands (e.g.,
Ries and Hirt, 2008).

Biological crusts are another crust type in dryland environments and consist normally of structural crusts in which nonvascular plants such every bit lichen or algae are nowadays. In a semiarid environment, they take a rough surface and enhance infiltration, contribute to soil cohesion reducing erositivity, and increase soil fertility (Harper and Marble, 1988; Belnap et al., 2005).

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Water Softening

Miklas
Scholz
, in


Wetlands for Water Pollution Control (Second Edition), 2016

17.v

Lime Recovery

All forms of atmospheric precipitation softening produce considerable volumes of sludge. Lime recovery is possible past calcining CaCOiii

sludge and afterward
slaking
calcium oxide (CaO) with water as shown in

Eqs. (17.5.ane) and (17.5.2). In this manner, more lime than is required in the plant is produced, and the surplus may exist sold. This solves the sludge disposal problem at the same time.

(17.5.1)


CaC

O
3




CaO
+
C

O
2


(

CO
2


tin

be

used

for

re

carbonation
)


(17.five.ii)


CaO
+

H
2

O



Ca


(
OH
)

2


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Waste Materials in Construction

West.
Brylicki
,
A.
Łagosz
, in


Studies in Environmental Scientific discipline, 1997

2.1

Materials

2.i.1

Wing ash „Skawina”

The wing ash was produced from the anthracite coal in the „Skawina” ability station. It complies with the standard requirements for the raw materials used in cellular concrete production. The chemical limerick of fly ash is given in
Table 1.


Tabular array 1.
Chemic composition of wing ash.


L.O.I. [%] SiOtwo
[%]
FetwoO3
[%]
Al.2Oiii
[%]
CaO [%] MgO [%] And sothree
[%]
Na2O [%] Thousand2O [%]
i,23 53,78 8,46 26,66 6,42 1,57 0,52 i,72 3,04

specific gravity

2.12 g/cm
iii

specific surface

3050 cm2/1000 (Blaine)

water need

27%

2.one.two

Ground burnt lime “Tarnów Opolski”

The ground burnt lime complying with the standard requirements for the raw materials used in cellular concrete product was used. The properties of lime are every bit follows:

active CaO + MgO content

87.1%

time of
slaking

28 min

temperature of slaking

68∼

full CaO content

93.5%

full MgO content

3.iv%

loss on ignition

three.0%

2.1.3

Flue gas desulfurization by-products

The following FGD past-products were used:

from moisture bialkaline method („Chrzanów” thermal ability station)

from semi-dry out „dry out scrubbing” procedure („Sosnowiec” thermal power station)

from fluidized bed combustion with desulfurization, both pressure installation (PFBC Canada) and atmospheric air circulation installation (FBC Canada).

The natural Shine gypsum raw fabric was also used as reference.

In
Tabular array ii
the chemical limerick of materials is shown (including gratuitous CaO).


Table 2.
Chemical composition of FGD by-products.


Sample Number Component in weight %
50.O.I. SiO2 AltwoO3 FetwoO3 CaOc MgO And soiii Soii CaOw
I 26,04 v,94 2,86 1,05 41,94 0,95 sixteen,72 vii,52 2,01
II 21,77 8,43 7,54 one,86 40,05 two,10 8,54 7,00 vii,39
III 14,24 11,xvi v,51 viii,42 43,54 0,34 15,75 0,88 17,32
Iv five,08 19,87 five,75 iv,28 44,23 0,59 17,71 0,94 15,34
5 24,21 12,00 6,00 11,96 30,66 0,42 fourteen,xi 9,93

I – material from bialkaline process („Chrzanów”)

II – textile from dry scrubbing process („Sosnowiec”)

III – material from pressure FBC installation („Canada”)

IV – material from FBC installation with atmospheric air circulation („Canada”)

5 – textile from dedusting of FBC installation gases

The chemical composition data for particular by-products show the significant differences between the sulfate components and costless CaO contents. One should also find the differences in sulfite contents, adamant every bit SO2.

The phase composition of FGD by-products was studied by XRD and DTA-TG methods. The results are shown in
Table iii. In some cases the products of desulfurization reaction was not identified because of poor crystalline form or low content. Therefore the presence of particular phases was deduced rather from chemic analysis information and DTA-TG curves (they are market by „*” in
Table iii). The sulfate and sulfite contents were calculated from the chemical composition. The results of this evaluation are as follows:


Table 3.
Phase composition of FGD past-products.


Phase Flue gas desulfurization by-product (every bit in
Table 2)
I Ii III IV V
CaSO4•2H2O, +
CaSO4, + + +
CaSO4•0.5H2O +*
CaSO3•0.5H2O, + +
CaSOthree +* +*
CaCOthree, + + + + +
Ca(OH)2 + + + + +
CaO, + +
βSiO2 + + + + +
FetwoO3 + + +
3Al2Othree•2SiO2
(mullite),
+
3CaO•Al2O3•3CaSOiv•32HtwoO +
CaSiO3•CaCO3•CaSO4•15H2O +*
unburned carbon +*

35.9% CaSO4•2H2O and fifteen.1% CaSOthree•0.5H2O for bialkaline process,

15.5% CaSO4•2HtwoO and xiv.1% CaSOthree•0.5H2O for dry scrubbing process,

26.8% CaSOiv
and 0.8% CaSO3
for pressure FBC,

thirty.one% CaSO4
and 0.nine% CaSOthree
for FBC,

24.0% CaSOiv
for dust from FBC installation.

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Simulation, Control, and Optimization of H2o Systems in Industrial Plants

Jijnasa
Panigrahi
,
Sharad C.
Sharma
, in


Industrial Wastewater Handling, Recycling and Reuse, 2014

12.3.3.2

Water Supply

Pure condensate generated from steam rut exchangers in digestion and evaporation will be boiler class and could be straight routed to the power firm as banality feed h2o.

Contaminated condensate can be routed for further use, depending on the level of contagion. If it contains less contagion, then it could be further used for flocculant grooming, lime
slaking, or in the filtration area. If the contamination level is too loftier, then information technology can be used in the residual washing surface area. Highly contaminated water or condensate can exist used for hosing, flushing, or for other dilution purposes. Alternatively, it tin go to the contaminated condensate tank until the quality is restored by suitably treating the contaminated h2o to brand it reusable.

Evaporation condensate normally contains very low soluble caustic and tin therefore be reused in the cooling belfry. Other than this, it tin be diverted for product hydrate washing or for use in precipitation seed filtration. The blowdown from the cooling tower can be further used in the washing area.

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The Chemistry of Saline and Sodic Soils

Donald L.
Sparks
, in


Environmental Soil Chemical science (Second Edition), 2003

Effects of Soil Salinity and Sodicity on Soil Structural Properties

Soil salinity and sodicity can accept a major issue on the construction of soils. Soil structure, or the arrangement of soil particles, is critical in affecting permeability and infiltration. Infiltration refers to the “downward entry of water into the
soil through the soil surface” (Glossary of Soil Scientific discipline Terms, 1997). If a soil has loftier quantities of Na+

and the EC is low, soil permeability, hydraulic conductivity, and the infiltration rate are decreased due to swelling and dispersion of clays and
slaking
of aggregates (Shainberg, 1990). Infiltration rate can be defined as “the volume flux of water flowing into the soil profile per unit of surface expanse” (Shainberg, 1990). Typically, soil infiltration rates are initially high, if the soil is dry out, and and so they decrease until a steady state is reached. Swelling causes the soil pores to become more narrow (McNeal and Coleman, 1966), and slaking reduces the number of macropores through which water and solutes can flow, resulting in the plugging of pores by the dispersed clay. The swelling of clay has a pronounced result on permeability and is affected by clay mineralogy, the kind of ions adsorbed on the clays, and the electrolyte concentration in solution (Shainberg

et al., 1971; Oster
et al., 1980; Goldberg and Glaubig, 1987). Swelling is greatest for smectite clays that are Na+-saturated. Equally the electrolyte concentration decreases, clay swelling increases.

As ESP increases, particularly to a higher place 15, swelling clays like montmorillonite retain a greater volume of water (Fig. x.4). Hydraulic conductivity and permeability decrease as ESP increases and salt concentration decreases (Quirk and Schofield, 1955; McNeal and Coleman, 1966). Permeability can be maintained if the EC of the percolating water is above a threshold level, which is the concentration of salt in the percolating solution, which causes a 10 to 15% decrease in soil permeability at a particular ESP (Shainberg, 1990).


FIGURE 10.4.
Water retention equally a function of ESP and pressure applied on montmorillonite.


From Shainberg et al. (1971), with permission.
Copyright ©
1971


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Assemblage: Physical Aspects☆

J.R.
Nimmo
, in


Reference Module in Earth Systems and Ecology Sciences, 2013

Miscellaneous methods

Many techniques involve deliberate wetting or immersion of the sample. Wet compared to dry measurements on aggregates finer measure different concrete backdrop of the soil. It is not only the degree of wetness that is important, but likewise the means by which water has been practical. Wetting the soil in a vacuum, for example, reduces the disruptive forces associated with trapped air and thus results in larger aggregates.

Fast wetting with no vacuum involves immersion of air-dried aggregates in h2o for a catamenia of fourth dimension before outset the mechanical sieving procedure. This type of wetting causes disintegration and
slaking, which may be undesirable. Loftier-vacuum fast wetting involves de-airing aggregates in a vacuum bedchamber under high vacuum, then instantaneously wetting them inside the bedroom. It generally produces minimal disruption. Slow aerosol wetting, in which samples on screens are moisture by vapor from below, produces piddling disintegration. Stabilities are higher and more reproducible with this type of wetting than with vacuum wetting. Wetting by slow wicking with or without vacuum allows aggregates to describe water in from moist filter newspaper. Used instead of h2o, organic solvents such as methanol may reduce amass disintegration by slaking, and may better preserve aggregate structure in drying.

Some other use of the rate-of-wetting phenomenon is past measuring soil water retention curves for beds of fast-wetted and slow-wetted aggregates. The less the stability, the greater volition be the departure between the curves for the fast-wetted and tiresome-wetted samples. The resulting alphabetize is comparable among different soils simply not in connection with other stability indices.

Ultrasonic dispersion tin supply the disruptive force to acquaintance with aggregate stability. The energy level that achieves a plateau in the quantity of aggregates remaining intact serves equally an index of stability.

Stability is sometimes considered operationally in terms of the fraction of sample weight remaining afterwards a prescribed sieving operation. Other methods measure the free energy needed to break aggregates by burdensome with parallel plates, every bit described above in connectedness with quantification of the energy of rupture. The results for a significant number of aggregates demand to be reduced to a statistical representation indicative of the properties of the bulk sample. The free energy required per increase in aggregate surface area can serve this purpose, as can a distribution role that indicates the probability of failure for a given applied rupture energy.

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What is the Process of Slacking

Source: https://www.sciencedirect.com/topics/earth-and-planetary-sciences/slaking

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