Effect of calcium sulphoaluminate cement on mechanical strength and waterproof properties of beta-hemihydrate phosphogypsum

Jin, Zihao; Ma, Baoguo; Su, Ying; Lu, Wenda; Qi, Huahui; Hu, Penghui

doi:10.1016/j.conbuildmat.2020.118198

Cited by 88 publications

(20 citation statements)

References 45 publications

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“…In particular, the possibility of modifying β-hemihydrate obtained from phosphogypsum (Yihua Fertilizer Inc., Hubei, China) with sulfoalluminate cement (SAC) was considered in [33]. The authors found that the introduction of 20% SAC in the composition of β-hemihydrate promotes an increase in strength (21.5 MPa) and an increase in the water resistance coefficient to 0.66.…”

Section: Plaster Bindersmentioning

confidence: 99%

Utilization of Gypsum-Bearing Wastes in Materials of the Construction Industry and Other Areas

Alfimova

Pirieva

Titenko

2021

Construction Materials and Products

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rational environmental management is one of the priorities of the technological development of the Russian Federation and most countries of the world. Particularly important in this area is the work undertaken with previously generated and accumulated waste, a whole group of which is gypsum-bearing wastes (GBW), which includes by-products of various industries: phosphogypsum, borogypsum, chlorogypsum, ferrogypsum, citrogypsum, vitamin gypsum, etc. GBW features are similar compositions, prevalence, perennial volumes of stored reserves with stable dynamics of annual growth. This determines the relevance of research on the development of a unified methodology for converting GBW of various types into target products particularly for construction purposes, providing maximum energy efficiency and minimal generation of secondary waste. The starting point of the research is the monitoring of approaches developed by the scientific community which are presented in the article. It is shown that researchers are exploring several main areas of GBW conversion: components of Portland cement and clinker; single and multicomponent binders; direct raw materials for the production of building materials; and road construction. The latter two directions have the greatest potential capacity for the consumption of GBW. The general level of research on the issue is not exhaustive, but has the potential to improve on existing methods of processing and application and promote the search for new and more efficient methods

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Section: Plaster Bindersmentioning

confidence: 99%

Utilization of Gypsum-Bearing Wastes in Materials of the Construction Industry and Other Areas

Alfimova

Pirieva

Titenko

2021

Construction Materials and Products

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“…The storage of phosphogypsum not only encroaches on the land, but also causes significant environmental pollution [1]. Although some attempts have been made to use phosphogypsum as a wallboard and building blocks in the field of construction [2][3][4], the poor water-resistance of phosphogypsum severely restricts its widespread application [5]. Many scholars have carried out researches to solve this problem.…”

Section: Introductionmentioning

confidence: 99%

The Coupling Effect of Organosilicon Hydrophobic Agent and Cement on the Water Resistance of Phosphogypsum

Chong

Gao

et al. 2022

Materials

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The objective of this paper is to investigate the coupling effect of cement and organosilicon hydrophobic agents on the water resistance of phosphogypsum. Different weight ratios of Portland cement were added to adjust the alkalinity of this system and further improve the work efficiency of the organosilicon hydrophobic agents. Some macroscopic performances, such as the water absorption, the compressive strength, the flexural strength, and the softening coefficient, were measured to characterize the water-resistance of phosphogypsum. The microscopic characteristics were analyzed via contact angle tests, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) to understand the mechanism of organosilicon hydrophobicity. The results indicated that both the compressive and flexural strengths of phosphogypsum first increased and then decreased with the increase of organosilicon hydrophobic agents. Meanwhile, the surface contact angle continued to increase and the softening coefficient exhibited an obvious increase. When the hydrophobic agent was combined with Portland cement, the softening coefficient of phosphogypsum further increased from 0.80 to 0.99, while the water absorption rate was significantly reduced from 16.0% to 0.8%. Microscopic tests proved that the hydrophobic organic molecules can be polymerized under the high alkalinity, and promote the formation of a hydrophobic film, thus significantly improving the water-resistance of phosphogypsum.

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“…The α-type hemihydrate gypsum is formed through the heating of dihydrate gypsum under pressurized steam or in acid or salt solution, which are both complicated processes [23]. The β-type hemihydrate gypsum is formed through the dehydration of dihydrate gypsum in a dry environment, but its products feature low mechanical strength, vulnerability to temperature, and poor waterproof performance [24]. Dihydrate PGCMs are prepared by mixing dihydrate gypsum with several additives, including fly ash, slag, cement, and activators [25].…”

Section: Introductionmentioning

confidence: 99%

“…Additives such as cement, fly ash, quicklime, and slag all have a positive effect on improving cement strength. Jin et al [24] prepared hardened samples using a mixture of PG and cement to study the compressive properties of the samples. The compressive strength increased as the cement content increased, and the maximum compressive strength could reach 20 MPa.…”

Section: Introductionmentioning

confidence: 99%

Effect of the phosphogypsum calcination time on the compressive mechanical properties of phosphogypsum-based composite cementitious materials

Zheng¹,

Lu²,

Luo³

et al. 2022

Mater. Res. Express

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In this study, phosphogypsum-based composite cementitious materials (PGCMs) were prepared by adding fixed proportions of additives to calcined phosphogypsum (PG). Samples with dimensions of 40 × 40 × 80 mm and 150 × 150 × 300 mm were used to study the effect of the PG calcination time on the PGCM compressive strength, stress–strain relationship, and failure mode and its mechanism. The test results indicated that the PGCM compressive strength gradually increased as the calcination time increased. When the PG calcination time was 180 min, the compressive strengths of the smaller and larger samples increased by 3 and 3.6 times, respectively, compared with the strengths at a calcination time of 20 min. The main reason for the strength increase was the formation of ettringite and hydrated calcium sulfate dihydrate in the PGCM gel system. Additionally, the PGCM compressive strength was significantly related to the sample size, and its reduction coefficient was between 0.60 and 0.69 at different PG calcination times. As the PG calcination time increased, the peak stress of the PGCM stress–strain curve and the corresponding axial strain increased gradually; moreover, brittle failure became more evident.

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Effect of calcium sulphoaluminate cement on mechanical strength and waterproof properties of beta-hemihydrate phosphogypsum

Cited by 88 publications

References 45 publications

Utilization of Gypsum-Bearing Wastes in Materials of the Construction Industry and Other Areas

Utilization of Gypsum-Bearing Wastes in Materials of the Construction Industry and Other Areas

The Coupling Effect of Organosilicon Hydrophobic Agent and Cement on the Water Resistance of Phosphogypsum

Effect of the phosphogypsum calcination time on the compressive mechanical properties of phosphogypsum-based composite cementitious materials

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