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Established in 2001, Puyang Zhong Yuan Restar Petroleum Equipment Co.,Ltd, “RSD” for short, is Henan’s high-tech enterprise with intellectual property advantages and independent legal person qualification. With registered capital of RMB 50 million, the Company has two subsidiaries-Henan Restar Separation Equipment Technology Co., Ltd We are mainly specialized in R&D, production and service of various intelligent separation and control systems in oil&gas drilling,engineering environmental protection and mining industries.We always take the lead in Chinese market shares of drilling fluid shale shaker for many years. Our products have been exported more than 20 countries and always extensively praised by customers. We are Class I network supplier of Sinopec,CNPC and CNOOC and registered supplier of ONGC, OIL India,KOC. High quality and international standard products make us gain many Large-scale drilling fluids recycling systems for Saudi Aramco and Gazprom projects.

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Effect of acid rain on economic loss of concrete ...
Effect of acid rain on economic loss of concrete ...

It is because that H + in acid rain reacts with Ca (OH) 2 on the concrete surface, then the decomposition of Ca + and SO 42− ions in rain will produce calcium dehydrate, which adheres to the concrete surface to form gray-white plaster powder ‘white frost’.

Physico-chemical interactions at the concrete-bitumen ...
Physico-chemical interactions at the concrete-bitumen ...

However, previous studies have shown that strong interactions occur ,between, cementitious materials and organic acids [13–17]. These reactions could modify not only the bioavailability of organic matter - and thus influence the reactivity of nitrates - but also the composition of the ,concrete, and its ability to buffer the chemical system (i.e. pH).

Fundamentals of Concrete - University of Wyoming
Fundamentals of Concrete - University of Wyoming

• Hydration - chemical ,reaction between, portland cement & ,water, ... •Clean & free of oils, salt, ,acid,, alkali, sugar, vegetable or other harmful substances •Potable ,water, - no testing required •Unknown quality - Table 814.1.2-1 ... –Better bond ,between concrete, lifts and rebar

Fundamentals of Concrete - University of Wyoming
Fundamentals of Concrete - University of Wyoming

• Hydration - chemical ,reaction between, portland cement & ,water, ... •Clean & free of oils, salt, ,acid,, alkali, sugar, vegetable or other harmful substances •Potable ,water, - no testing required •Unknown quality - Table 814.1.2-1 ... –Better bond ,between concrete, lifts and rebar

Deterioration of Concrete Immersed in Sulfuric Acid for a ...
Deterioration of Concrete Immersed in Sulfuric Acid for a ...

Deterioration of concrete caused by sulfuric acid attacks in sewage and waste water treatment plants has been investigated. To evaluate this type of deterioration, concrete specimens immersed in sulfuric acid solutions are usually examined, and the mass loss and erosion depth of the specimens can be used as physical indicators of the degree of the ...

Chemical Interactions between Cr(VI) and Hydrous Concrete ...
Chemical Interactions between Cr(VI) and Hydrous Concrete ...

Results indicate that redox, adsorption, and precipitation are the three major reactions occurring at the concrete−water interface. The solution pH plays a significant role in determining the characteristics of chromium reaction behavior with concrete materials. In acidic systems, Cr(VI) species are removed from the solution by reduction reactions.

Is concrete resurfacing necessary for stained concrete ...
Is concrete resurfacing necessary for stained concrete ...

Chemical stains (acid stains) are water based acidic solutions of metallic salts react with the lime in the concrete. After the chemical reaction is completed, the stains (which are actually metallic oxides) become integral part of the concrete and gives it a beautiful mottled colored surface. The critical element of coloring concrete surfaces with an acid stain or chemical stain is the reaction between the stain and …

Beneficial Use of Carbon Dioxide in Precast Concrete ...
Beneficial Use of Carbon Dioxide in Precast Concrete ...

For a ,reaction, within a 24-hour process window, the theoretical maximum possible carbon uptake in ,concrete, is found to be 29% based on cement mass in the product. To reach the maximum uptake, a special process is developed to promote the ,reaction, efficiency to 60-80% in 4-hour carbon dioxide curing and improve the resistance to freeze-thaw cycling and sulfate ion attack.

ESTIMATION OF SERVICE LIFE OF CONCRETE PIPES IN SEWER NETWORKS
ESTIMATION OF SERVICE LIFE OF CONCRETE PIPES IN SEWER NETWORKS

Fig. 3: Sulfide generation and corrosion in domestic and industrial ,waste water, systems The rate of corrosion of ,concrete, pipes depends on the strength and density of ,concrete,, the degree of ,acid, penetration, the ,acid, value and the circulation of hydr o-gen sulfide in the atmosphere. An important influence on the rate of corrosion is e x-

(PDF) CHEMICAL ADMIXTURES: A MAJOR ROLE IN MODERN CONCRETE …
(PDF) CHEMICAL ADMIXTURES: A MAJOR ROLE IN MODERN CONCRETE …

A proper use of admixtures offers certain beneficial effects to ,concrete, including improved quality, acceleration or retardation of setting time, enhanced frost and Sulphate resistance, control of ...

What Is the Proper Method for Concrete Slurry Disposal ...
What Is the Proper Method for Concrete Slurry Disposal ...

Before disposing of the ,water,, test the pH level to make sure the ,water, is neutral and safe. If the ,water,’s pH appears high, add pH down or pool ,acid, to the ,water,, which can be found at any pool ...

Chemical attack on the durability of underground structures
Chemical attack on the durability of underground structures

Mechanism of Acid Attack on Concrete 1. Acids decompose the hydrates of cement paste to form soluble calcium salts 2. These soluble calcium salts will leach out in the presence of water 71. Mechanism of Acid Attack on Concrete 1. Acid in solution from the surrounding environment will come into contact with the surface of the concrete. 2.

What Is the Proper Method for Concrete Slurry Disposal ...
What Is the Proper Method for Concrete Slurry Disposal ...

Before disposing of the ,water,, test the pH level to make sure the ,water, is neutral and safe. If the ,water,’s pH appears high, add pH down or pool ,acid, to the ,water,, which can be found at any pool ...

(PDF) Accelerating admixtures for concrete
(PDF) Accelerating admixtures for concrete

mixing ,water,, i.e. being capable of depressing the freezing point of ,water, in the fresh ,concrete,, but the main action is to acceler ate the hydration of cement like conventional accelerators [ 55 ] .

Factors affecting durability of concrete • Aggregate ...
Factors affecting durability of concrete • Aggregate ...

Oxidation of sulfide minerals in clay adjacent to the concrete – this can produce sulfuric acid which reacts with the concrete . Bacterial action in sewers – anaerobic bacterial produce sulfur dioxide which dissolves in water and then oxidizes to form sulfuric acid

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