Lightweight gypsum materials ed by the help of stone dust were investigated. Lightweight material prepared from the gypsum as a main binder and ed by stone dust and acid agent. The materials with the bulk density are 607 kg/m3, compressive strength about 1.3 MPa and thermal conductivity was prepared. Basic physical, …

In the present study an innovative method, consisting in the direct addition of a pre …

The ing process is one of the important ways to prepare lightweight porous gypsum. Physical ing is the term used to describe the process of ing concrete by directly incorporating preformed into the mixed slurry [16].The addition of a chemical ing agent to the cement slurry produces a chemical reaction,which …

A ed phosphogypsum-based composite (FPGC) was synthesized in this study via chemical ing and the effect of hydrogen peroxide (H 2 O 2) (0.5% to 2.5%) on its properties was investigated.With the increasing dosage of H 2 O 2, more ed pores were produced, causing a decline in the mechanical strength and water …

This paper deals with the effect of substances producing and assisting gas and formation on the properties of gypsum density and strength. The gas-based ing method utilises aluminium sulphate, potassium alum or ammonium bicarbonate for the chemical production of gas bubbles in gypsum paste. The second method obtains …

DOI: 10.1016/J.JCLEPRO.2016.02.111 Corpus ID: 155141625; Characteristics and utilization of sugarcane filter cake waste in the production of lightweight ed concrete @article{Makul2016CharacteristicsAU, title={Characteristics and utilization of sugarcane filter cake waste in the production of lightweight ed concrete}, author={Natt Makul …

In the present study an innovative method, consisting in the direct addition …

DOI: 10.1016/j.conbuildmat.2019.117791 Corpus ID: 213368101; Use of green calcium sulphoaluminate cement to prepare ed concrete for road embankment: A feasibility study @article{Ge2020UseOG, title={Use of green calcium sulphoaluminate cement to prepare ed concrete for road embankment: A …

Utilizing the chemical reaction principles H2O2 was catalyzed by MnO2, instead of being catalyzed by warm water. In the gypsum slurry, due to the chemical reaction of hydrogen peroxide a large number of bubbles were produced, and the material was self-ing. The H2O2 ing agent and the method of ing affected the …

The BoVac Drum filter with 1 m² filter area is operated in parallel to a 12 m² belt filter for filtration and washing of gypsum.. The gypsum is produced in a precipitation process by mixing lime with sulfuric acid, which has a pH …

We studied lightweight vacuum-ed concrete containing fly ash and desulfurisation gypsum by revealing the influence of experimental parameters on the ing expansion ratio under vacuum and atmospheric conditions and the influence of vacuum degree on the properties of ed concrete.The correlation between the …

Bulk density of the ed gypsum ranged from 0.20 to 0.58 g/cm 3 and the pore size reached 50 µm to 1.3 mm depending on the concentration of the surfactant. The compressive strength of the ...

The pure gypsum, ordinary ed gypsum with different densities (800 kg/m³, 650 kg/m³), ed gypsum with glass fiber or with expanded vermiculite were tested in the temperature range of 25 ...

ALPHA ER is an anionic ing agent for gypsum wallboard, firefighting applications, and forming products. Details.

Patent US4612333A - ed gypsum filter containing carbonaceous material (US 4,612,333 A); Owner: Neiko I. Vassileff; Filed: 03/22/1985; Est. priority date: 03/22/1985; Status: Expired due to Fees; Abstract: A filter composition is formed from a ed gypsum combined with fine particulate carbonaceous material such as activated carbon, …

The present work aimed to explore the potential of using Al2(SO4)3 and NaHCO3 as gas-producing additives for the formation of ed gypsum. Three systems of additives, namely Al2(SO4)3 + CaCO3, Al2(SO4)3 + citric acid, and NaHCO3, were investigated for their -forming ability in order to lower the thermal conductivity while …

This paper describes the direct-ing of plaster of Paris (CaSO 4 ·½H 2 …

For example, the red gypsum can be used for cement production as a binder [50], green concrete [51], calcium sulpho-aluminate cement [52], ed concrete [53], cementitious materials [54], and ...

Abstract. This paper deals with the effect of substances producing and …

This paper describes the direct-ing of plaster of Paris (CaSO 4 ·½H 2 O) with up to 1.7 wt% of a nonionic surface-active agent to obtain highly porous, lightweight gypsum (CaSO 4 ·2H 2 O) with 65–70% total porosity and a homogeneous, bimodal pore size distribution. Based on viscosity and temperature changes in the setting plaster of Paris slurry, the …

Lightweight ed gypsum pastes involving low-density gypsum with higher-density aggregates (A) and higher-density gypsum with low-density aggregates (B) were envisaged by Vimmrová et al., [95]. The compressive strength of gypsum composite, A was not appropriate, but their thermal insulation is quite similar to commercial gypsum.

ALPHA ER is an anionic ing agent for gypsum wallboard, firefighting …

To achieve the set objective, while studying ed gypsum mixtures [11], aluminum sulphate was used as a gas-forming additive. The average density was 694 kg/m 3, and the compressive strength 0. ...

ed gypsum with dimensions of 40 mm×40 mm×160 mm was scanned with the X-CT Precision system (YXLON, Germany). The detector was a flat-panel type Y.XRD 1620 with an object rotation angle of 360°. The working voltage and current of X-ray tube were 195 kV and 0.26 mA. The X-ray CT raw data was collected and recorded by a …

744 Luca Boccarusso et al. / Procedia Manufacturing 47 (2020) 743–748 2 Boccarusso et al. / Procedia Manufacturing 00 (201 9) 000–000 On the other hand, gypsum can also be adopted as building ...

Stepan Gypsum er Technologies: Wide range of coalescing abilities to obtain …

ed phosphogypsum (FPG) has recently attracted extensive interest owing to its potential consumption of phosphogypsum and its substitution for traditional gypsum building materials. However, as an important component in the preparation of FPG, the effect of ing agent on the performance of FPG is still unclear.

Furthermore, ed gypsum samples up with 0.75% plastic fibers achieved the highest flexural and compressive strengths. The water absorption of the specimens also decreased with increasing fibers ...

ed concrete (FC) in this experiment were prepared using original red gypsum (RG), finely ground titanium-extracted residues (TRs), ordinary Portland cement (OPC), quick lime, sulfoaluminate cement (SAC) and silica fume (SF), water, superplasticizer and ing agent. ... Characteristics and utilization of sugarcane filter …