High-pressure apparatus for compressibility studies and its application to measurements on leather and collagen

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Measurements are reported of the compression of rubber-sulfur vulcanizates in the temperature range 10 0 to 81.5 0 C between pressures 1,000 and 10,000 at~ospheres .. Sulfur contents varied from 10 to 28 percent. Emp~rical isother~al compressIOn equatl~ns are derived. Empirical isobaric equations are denved for speCific vol.ume. From t he Isobars empirical equations of state (press ure-volume-temperature) are denved.

Section: Results Of Compression Measurementsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

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Temperature dependence of compression of natural rubber-sulfur vulcanizates of high sulfur content

Weir¹

1953

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“…Methods used in mea sur ing compressions have been desc rib ed in detail in an earlier paper [8]. All oxides were in powder form and were con tained in a small stainless-steel cylinder that was open at one end.…”

Section: Experimental Methods and Materialsmentioning

confidence: 99%

Isothermal compressibilities of alkaline earth oxides at 21 C

Weir¹

1956

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Comp ressio n measurements were made by t he piston-displacement method on powdered alkaline earth oxides at 21 0 C at 1,000-atmosp here inte rvals for press ures between 2,000 a nd 10,000 atmospheres. Pressure volum e data are linear \yit hin experimental error. Compressibilities, {3, and standard deviations of compressibili ties, u, in units of 10-6 per atmosp here are as follows: BeO, {3 = 0.27, u= 0.04 ; MgO, {3 = 0.60, u= 0.12; CaO, {3 = 0.89, u= 0 .04; SrO, {3 = 0.84, u = O.lO ; BaO, {3 = 1.76, u= 0.05 . Some abnormali ty in compressibility behavior fo r· CaO and SrO is noted. This is probably related to a similar abnormality in densities.

“…The compressibility of steel has been measured by Bridgman [7J . The compress ion is defined as -6 V IV o, wher e V o is the volume of the specimen a t 1 atm, a nd 6 V is the change in tllC volume r eckoned from th e fidu cial pressure of 2,000 atm ; compressions at lower pressures, ther efore , appear as nega tive values. All measurements described h er e wer e made with decr easing pressures, and frictional forces a t the packing on the piston preven ted th e a ttainment of r easonable accuracy at pressures much below 2,000 a tm.…”

Section: Compression Measurementsmentioning

confidence: 99%

Behavior of cements and related materials under hydrostatic pressures up to 10,000 atmospheres

Weir¹,

Hunt²,

Blaine³

1956

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Compression studies were made o n harde ned cement pastes at 21 0 C a nd a t press ures as high as 10,000 atmospheres. The effects of composit io n, age, m oisture co nte nt, and water-ceme nt ra tio were s tudied. Compressibility of dried portla nd cement p astes appeared to proceed t hrough a maximum wi t h increased cure, the existence or location of t he maximum being d epende nt on t he water-ceme nt ratio. Compression of both portland a nd aluminous ceme nts increased wi th increasing e vaporable water co nte nt. Portla nd ceme nts with evaporable water conte nts in t he range 17. 5 to 32.4 perce n t exhibited a t ransit io n between 2,000 and 3,000 atmospheres. N o similar effect occm ed in a luminous ceme nt. Experiments indicated t hat t he t rans it io n was a ttributable to h ydrated lime formed in t he po rt la nd cem ent. Average co mpressibilities of dri ed paste were 3.1 X 10-6 a nd 2.2 X 10-6 atm-I bet wee n 1 and 5, 000 a t mospheres and betwee n 5, 000 a nd 10,000 atmospheres, res pectively. Co mpress io n tudies were a lso mad e wi t h wet s ilica gel, h ydrated t ricalcillm s ili cate, a nd dr y a nd wet calcium h ydrox id e.