Stability of calcium sulfate base course in a wet environment

  • 77 Pages
  • 4.37 MB
  • English
Louisiana Transportation Research Center, Available through the National Technical Information Service , Baton Rouge, LA, [Springfield, VA
Roads -- Louisiana -- Base courses -- Moisture., Calcium sulfate -- Louisiana., Waste products as road materials -- Louis
Statementby Zhongjie "Doc" Zhang, Mingjiang Tao.
ContributionsTao, Mingjiang., Louisiana. Dept. of Transportation and Development., Louisiana Transportation Research Center.
LC ClassificationsTE212 .Z43 2006
The Physical Object
Paginationxvi, 77 p. :
ID Numbers
Open LibraryOL16422938M
LC Control Number2007395936

Stability of Calcium Sulfate Base Course in a Wet Environment By Zhongjie “Doc” Zhang, Ph.D., P.E. Mingjiang Tao, Ph.D. Louisiana Transportation Research Center Gourrier Avenue Baton Rouge, LA LTRC Project No. GT State Project No.

Conducted for Louisiana Department of Transportation and Development. Get this from a library. Stability of calcium sulfate base course in a wet environment. [Zhongjie Zhang; Mingjiang Tao; Louisiana. Department of Transportation and Development.; Louisiana Transportation Research Center.].

Blended calcium sulfate (BCS), a recycled fluorogypsum waste material, has been used in Louisiana as a pavement base layer for more than a decade. Without further chemical stabilization, the major concern of using raw BCS as a pavement structural layer is Cited by: 2.

Phosphogypsum is a calcium sulfate hydrate that is pumped into ponds, eventually dewatered, and ultimately disposed of in large stockpiles called stacks. Phosphogypsum has been recovered and reused with some success in stabilized road bases, (4) unbound road bases, (5) and roller-compacted concrete.

Stability of calcium sulfate base course in a wet environment. Published Date: its moisture sensitivity has concerned LA DOTD engineers because it has presented construction difficulty in wet environments.

Therefore, there is a need to better understand the strength deterioration of BCS in a wet environment, and find ways to Cited by: The use of BCS within DOTD as a base course material can be supplemented with the addition of a slag-stabilized BCS (inplace and pugmilled).

Stability of calcium sulfate base course in a wet environment. Published Date: BCS is short for blended calcium sulfate, a recycled fluorogypsum mixture that has been used in Louisiana Author: Gavin P Gautreau, Khalil I Hanifa. FIELD PERFORMANCE OF STABILIZED BLENDED CALCIUM SULFATE MATERIALS UNDER ACCELERATED PAVEMENT TESTING Stability of Calcium Sulfate Base Course in a W Sulfate Base Course in a Wet Environment.

Base Course Test Sections Built with Waste Calcium Sulfate, Lime, and Fly Ash MUMTAZ A. USMEN and LYLE K. MOULTON ABSTRACT Although a modest amount of information is available on the properties of lime-fly ash-calcium sulfate mixtures, little is known about their field performance.

Conse­. Calcium Sulfate. Gypsum is the common name of the mineral calcium sulphate dihydrate, which is mined in various places around the world and now is also being produced in a relatively pure form as a by-product of sulphur dioxide removal processes for power station exhaust gases.

From: Materials Science for Dentistry (Tenth Edition), Calcium sulfate can also be produced as a by-product of mixing calcium phosphate with sulfuric acid. However, the calcium sulfate produced from this reaction requires special handling and should not be confused with the synthetic gypsum marketed by GSM.

TxDOT ITEM The synthetic gypsum marketed by GSM is generally accepted as an approved. Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO 4 and related the form of γ-anhydrite (the anhydrous form), it is used as a particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral has many uses in industry.

All forms are white solids that are poorly soluble in water.E number: E (acidity regulators, ). Stability of Calcium Sulfate Base Course in a Wet Environment: View PDF: ST: Monitoring System to Determine the Impact of Sugarcane Truckloads on Non-Interstate Bridges: View PDF: P: Comparative Evaluation of Subgrade Resilient Modulus from Non-destructive, In-situ, and Laboratory Methods: View PDF: C.

DESCRIPTION: This material shall consist of a fly ash stabilized base course composed of crushed calcium sulfate aggregate in accordance with these specifications and shall conform to the dimensions, lines and grades as shown on the plans or as directed by the Engineer.

Address: P.O. Box Batavia, IL Phone: Fax: Email: [email protected] and a good source of calcium. Calcium Sulphate is used to improve soil quality 3. The most important applications are 4: for the reclamation of sodic soils through ion exchange (calcium replacing sodium) to reduce run-off water and its resulting erosion in dry agricultural areas as an ameliorant for acidic subsoils and soils in forestryFile Size: KB.

Material Safety Data Sheet. The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the material safety data sheet for this chemical from a reliable source and follow its directions. Calcium Sulfate Dihydrate: Excaliber Minerals LLC Calcium Sulfate Anhydrous:Inc.

Structure and properties. Other articles where Calcium sulfate is discussed: chemical industry: Sources of sulfur: the world, abundant supplies of calcium sulfate in any of several mineral forms can be used to make the ammonium sulfate by combining it with ammonia and water. This process brings the sulfur in the calcium sulfate deposits into use.

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Because deposits of calcium sulfate throughout the. the stability of a water with respect to its degree of CaCO3 saturation. If a water has a negative LSI value, it is under-saturated with respect to calcium carbonate and is potentially corrosive.

Conversely, for waters with a positive LSI, a protective layer of. Calcium Sulfate is generally immediately available in most volumes. Ultra high purity and high purity compositions improve both optical quality and usefulness as scientific standards. Nanoscale elemental powders and suspensions, as alternative high surface area forms, may be considered.

We also produce Calcium Sulfate Solution. CALCIUM SULFATE is non-combustible. Decomposes to give toxic oxides of sulfur, but only at very high temperature (>°C). Generally of low reactivity but may act as an oxidizing agent: incompatible with diazomethane, aluminum, and phosphorus.

Certain forms of calcium sulfate react with water; others do not. Calcium Sulfate Formation and Mitigation when Seawater Was Used to Prepare HCl-Based Acids. (December ) Jia He, B.S., China University of Petroleum Chair of Advisory Committee: Dr.

Hisham A. Nasr-El-Din It has been a practice to use seawater for. Calcium Chloride is a crystalline, white substance, soluble in water, Calcium Chloride is the chloride salt of calcium, a bivalent metallic element with many crucial biological roles.

Calcium is a major constituent of the skeleton but plays many roles as an intracellular and plasma ion as well. In medicine, calcium chloride is also used as a 10% solution in injection, for calcium.

Gypsum, another calcium compound, is the material used to make Sheetrock, or drywall. Its chemical name is calcium sulfate dihydrate. Other important compounds are lime (calcium oxide, CaO) and “slaked” lime (calcium hydroxide, CaOH). The word “calcium” is derived from the Latin calx, which means lime.

Romans mixed slaked lime with sand. Calcium sulfate can also be produced as a byproduct of other reactions, or created in artificial reactions in a lab or factory. It is a nontoxic compound, but will harm the respiratory system if it is inhaled directly (5).

Overall, calcium sulfate is a fairly safe, unreactive compound composed of calcium, sulfur, and oxygen. Calcium carbonate scale - Results primarily from localized heating of water containing calcium bicarbonate.

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Calcium carbonate scale formation can be controlled by pH adjustment and is frequently coupled with the judicious use of scale inhibiting chemicals. Calcium sulfate scale - Usually forms as gypsum is more than times as soluble as.

GYPSOIL is calcium sulfate dihydrate (CaSO 4 • 2H 2 O). It dissolves (dissociates) with moisture into free calcium and sulfate. The sulfate (SO 4) attaches primarily to excess magnesium (Mg), aluminum (Al) and sodium (Na) in the soil complex, making soluble compounds that move down and out of the crop rooting environment.

The remaining Ca. FGD Scrubber Material - Material Description ORIGIN The burning of coal produces sulfur dioxide (SO 2) Clean Air Act and subsequent amendments regulate SO 2 emissions from burning coal.

Coal fired power plants installed flue gas desulfurization (FGD) technology for reducing SO 2 emissions. The two most common scrubber technology used today are wet or. This article took the sodium sulfate and calcium chloride as the raw material and prepared calcium sulfate whiskers by hydrothermal method.

The experimental results show that the calcium sulfate precursors are prepared by the reverse feed mode in which the sodium sulfate solution drop into the calcium chloride solution under the solution concentration mol/L and the molar ratio of Cited by: 5.

Description Stability of calcium sulfate base course in a wet environment FB2

Calcium sulfate occurs in nature in form of three different minerals distinguished by the degree of hydration: gypsum (CaSO42H2O), hemihydrate (CaSO4H2O) and anhydrite (CaSO4). Abstract: As a recycled material, flue gas desulfurization gypsum has been used to prepare calcium sulfate hemihydrate whisker (CSHW) through hydrothermal synthesis for several decades.

However, the subsequent utilization of this resultant material has not yet received considerable attention. In the present research, CSHW was successfully synthesized at a Cited by: 7.

Field Testing Sections with Stabilized Blended Calcium Sulfate as Base Courses. Blended calcium sulfate (BCS), an industrial by-product from hydrofluoric acid, was successfully stabilized with grade, ground, granulated blast furnace slag (GGBFS) in a by: 2.Stability of Calcium Chloroaluminate and Calcium Sulfoaluminate Phases in Hydraulic-Cement Mixtures [Toy S.

Poole] on *FREE* shipping on qualifying offers. Stability of Calcium Chloroaluminate and Calcium Sulfoaluminate Phases in Hydraulic-Cement MixturesAuthor: Toy S.

Poole.of calcium sulfate [1] in many portland cement clinkers, since the total equilibrium pressure of SOa, S02, and O2 over a mixture con­ taining calcium sulfate, silica, and alumina may be expected to be several atmospheres at clinkering temperatures.

The transition of the ordinary forms of anhydrite to the high­.