Desulfurized gypsum powder used in asphalt mixture

Property Characterization of Asphalt Binders and Mixtures …

This study focused on the property characterization of asphalt and asphalt mixtures modified by different types of crumb rubber (normal and desulfurized). This characterization was based on chemical evaluation and property testing for rubber asphalt and on performance analysis for different rubber asphalt mixtures.

Study on the feasibility of desulfurized-high-calcium-fly …

Request PDF | Study on the feasibility of desulfurized-high-calcium-fly-ash (DHCFA) used in asphalt mixture as mineral powder | Harmless treatment and …

What is the desulfurized gypsum? | gkmill

2020-9-1 · The main component of desulfurized gypsum is calcium sulfate dihydrate, which is an industrial by-product obtained by using lime-limestone to recover sulfur dioxide in coal-fired flue gas. The desulfurized gypsum is dried, calcined, aged, modified, etc. to dehydrate and decompose the dihydrate gypsum to remove 1.5 crystal water, and the product ...

what is the calcination temperature of desulfurized …

2021-9-29 · What Is Gypsum How Gypsum Is Processed . use of gypsum. gypsum is a widely used industrial material and building material. gypsum (caso 4 2h 2 o) can be calcined and grinded to obtain -type hemihydrate gypsum (2caso 4 h 2 o), that is, building gypsum, also known as cooked gypsum or plaster. the model gypsum can be obtained when the calcination …

Study on the feasibility of desulfurized-high-calcium-fly …

Study on the feasibility of desulfurized-high-calcium-fly-ash (DHCFA) used in asphalt mixture as mineral powder. Harmless treatment and resource utilization of wastes like fly ash have always been a social difficulty and a research hot spot in the field of pavement. In this paper, samples of fly ash generated from a coal-fired power plant in ...

Waterproof caulking dihydrate desulfurized gypsum putty …

2010-3-12 · The waterproof caulking dihydrate desulfurized gypsum putty comprises 70-90% of a composite gelling material which contains 65-75% of dihydrate desulfurized gypsum, 20-25% of an active material, 5-15% of an exciting agent and 0.5-2.0% of a coagulation accelerator, 10-20% of an early strength agent, 0.1-0.4% of a water-retaining agent, 0.2-0.8% ...

Superfine Desulfurization Gypsum can Improve the …

2021-12-19 · Tens of millions of tons of desulfurized gypsum can be produced in China every year. Desulfurization gypsum is used as an admixture to replace part of cement in concrete. And the smaller the particle size of desulfurized gypsum, the better the mechanical properties of cement mortar. The compressive and flexural tests show that the cement mortar with 3% and …

Superior Uses of Gypsum in Building Construction

2017-9-7 · When used for building construction, the gypsum powder must adhere to specific conditions. It must have a bulk density of 1020kg/m 2 and a 25 kg bag must provide coverage of 21square feet when the thickness of the plaster is 13 mm. The setting time must be 25-30 minutes and it must have a compressive strength of 60-70 kg/cm 2. The colour of the ...

Desulfurized Gypsum

Desulfurized Gypsum, Find Complete Details about Desulfurized Gypsum,Architecture Building Supplies,Desulfurized Gypsum Powder,Hpmc For Desulfurized Gypsum from Plasterboards Supplier or Manufacturer-Shouguang Zhongyang Trading Co., Ltd.

Characteristics of desulfurized rubber asphalt and mixture

2015-6-22 · The preparing temperature of the desulfurized rubber asphalt mixture can be reduced by 10∼20°C compared to the crumb rubber asphalt mixture. Moreover, without the interference of solid rubber particles, the desulfurized rubber asphalt can be used in dense-graded asphalt mixture while crumb rubber asphalt mixture tends to use gap gradation ...

Production and resource utilization of flue gas …

2021-11-1 · 1. Introduction. Flue gas desulfurized gypsum mainly comes from thermal power plants, smelters, and large-enterprise boilers, and contains industrial by-products produced through a wet desulfurization combustion process, where SO 2 gas and lime slurry react under strong oxidation conditions. The main component of this gypsum is calcium sulfate dihydrate, …

Performance of a Composite Soil Prepared with Red Mud …

2021-9-18 · Given the great environmental pressure brought by the massive stacking of solid waste, red mud and desulfurized gypsum were used to prepare cementitious materials. In this paper, three different material ratios with a 60% content at different curing ages (7 d, 14 d, and 28 d) were utilized to prepare the composite soil. To explore the performance of the composite …

Characteristics of desulfurized rubber asphalt and mixture

2015-6-22 · The aims of this paper are to prepare disintegrated high volume crumb rubber asphalt (DHVRA) with low viscosity, good workability and low-temperature performance by adding disintegrating agent (DA ...

Effect of Desulfurization Process Variables on the …

2022-3-28 · The desulfurized crumb rubber powder modified asphalt prepared by crumb rubber treated with different OD desulfurizer content (i.e., 1.5%, 3%, 4.5%, 6%) were prepared with the mixing time of 60 min and mixing temperature of 120 °C. The changes of physical properties of desulfurized crumb rubber powder modified asphalt were compared and analyzed.

What is Asphalt

What is Asphalt. Asphalt is a mixture of aggregates, binder and filler, used for constructing and maintaining roads, parking areas, railway tracks, ports, airport runways, bicycle lanes, sidewalks and also play- and sport areas. Aggregates used for asphalt mixtures could be crushed rock, sand, gravel or slags.

Study on desulfurized gypsum used as cement retarder

2021-3-1 · When the proportion of desulfurized gypsum and natural gypsum is 1:1 and the content is 3%, it has a better retarding effect on Portland cement. Export citation and abstract BibTeX RIS. Previous article in issue. Next article in issue. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any ...

Production and performance of desulfurized rubber …

2017-5-1 · An unmodified binder, i.e., KLMY90# (Karamay), that has been regularly used in China was selected as the base binder. Table 1 shows the chemical constituents of the base binder. Fig. 2 shows the desulfurized rubber powder, which presented a honeycomb structure with approximately 6 mm in diameter. Its main technical specifications and solubility test results are …

Study on desulfurized gypsum used as cement retarder

The effects of desulfurized gypsum, heat-treated desulfurized gypsum and hydrogen peroxide modified desulfurized gypsum on the setting time of Portland cement were studied. The results showed that when the content of desulfurized gypsum after 80 °C heat treatment was 4% of Portland cement, the initial setting time was 136min, and the final setting time was 196min, …

Performance and inorganic fume emission reduction of …

RA has a higher viscosity than base asphalt, which in turn increases the energy consumption and the asphalt mixture cost in the mixing and paving processes (Ameri et al., 2020). In addition, rubber powder and asphalt are easily segregated during the mixing and storage processes, thus reducing the storage stability of RA (Liang et al., 2015 ...

Utilization of steel slag as aggregate in asphalt mixtures …

2017-5-20 · The literature reviews demonstrate that the asphalt mixtures with steel slag possess not only higher stiffness and lower permanent deformation but also better fatigue, aging and abrasion resistance in contrast to conventional asphalt mixtures (Huang et al., 2012, Xie et al., 2013, Wen et al., 2016, Kanitpong and Bahia, 2003). However, as a kind ...

Performance of asphalt binder with different contents of …

Download scientific diagram | Performance of asphalt binder with different contents of desulfurized rubber powder. from publication: Production and Performance of Desulfurized Rubber Asphalt ...

Performance and inorganic fume emission reduction of …

2022-6-15 · The stability of the composite modified asphalt mixture was greater than 6.0 kN after immersion for 20 min and 48 h, and the residual stability was 91.3%. The stability of the SBS modified asphalt mixture after immersion for 20 min and 48 h were 7.05 and 6.28 kN, respectively, and the residual stability was 89.1%.

Characteristics of Desulfurized Rubber Asphalt and Mixture

The preparing temperature of the desulfurized rubber asphalt mixture can be reduced by 10∼20°C compared to the crumb rubber asphalt mixture. Moreover, without the interference of solid rubber particles, the desulfurized rubber asphalt can be used in dense-graded asphalt mixture while crumb rubber asphalt mixture tends to use gap gradation ...

Performance Evaluation of Desulfurized Rubber Asphalt …

To understand the performance of desulfurized rubber asphalt (DRA) and its application feasibility comprehensively, the road performance, viscosity–temperature characteristics, rheological properties, storage stability, aging resistance, and environmental performance of DRA were investigated and compared with ordinary rubber (hereinafter called rubberized rubber) asphalt.

Study on desulfurized gypsum used as cement …

2021-4-9 · The effects of desulfurized gypsum, heat-treated desulfurized gypsum and hydrogen peroxide modified desulfurized gypsum on the setting time of Portland cement were studied. The results showed that when the content of desulfurized gypsum after 80 C heat treatment was 4% of Portland cement, the initial setting time was 136min, and the final setting time was 196min, …

Effect of Desulfurization Process Variables on the

2022-3-28 · Place the base asphalt in an oven of 140 °C and heat it to the flowing state, and slowly add the weighed desulfurized crumb rubber powder (25% of asphalt by mass) with a mixing speed of 300 r/min. During the addition process, the temperature was raised to 170 °C and maintained for 10 min;

Research on Road Performance of Desulfurized Rubber …

Abstract: In order to discuss the road performance of desulfurized rubber asphalt and mixture, Swelling mechanism of desulfurized rubber asphalt was studied first, and then performance testing of KLMY90#, normal rubber asphalt and desulfurized rubber asphalt were taken, after that, penetration, shear strength and cohesive strength of ...

Characteristics of Desulfurized Rubber Asphalt and Mixture

The microstructures of desulfurized rubber asphalt and crumb rubber asphalt were identified by using the scanning electron microscope technology, component …

The Harm Of Desulfurized Gypsum Powder

2021-7-29 · Process For Producing Desulfurized Gypsum Powder. process for producing desulfurized gypsum powder nov 13, 2018 the wet-based desulfurization gypsum is fed into a φ3×25m high-efficiency rotary dryer through a double-screw feeder and a belt conveyor for drying, and the physical water is taken off.,10 gypsum rules,the gypsum should be mixed under …

What materials are used in asphalt? | The News God

2021-7-19 · Then the asphalt binder is then washed, dried, and heated. After that, both the asphalt binder and aggregate are heated to the desired temperature, blended in a pugmill or drum—these are two machines used to create a homogenous asphalt mixture. When making asphalt, choosing the right temperature for the whole process is essential.