Study on the hydration and properties of multiphase phosphogypsum synergistically activated by sodium sulfate and calcium sulfate whisker

Jiao, Jiawei; Shen, Xuepeng; Ding, Hao; Lu, Donghua; Li, Dongxu

doi:10.1016/j.conbuildmat.2022.129225

Cited by 10 publications

(2 citation statements)

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“…From the graph, it can be seen that the rate of dimensional change of PGSL shows a trend of decreasing and then increasing with the addition of SG, with the lowest rate of size change when the SG doping is 0.03% and 0.04%, i.e., K3 and K4. Since construction gypsum's theoretical water demand is 18.6% of its weight [29], the overall PGSL in this experiment demonstrated a phenomenon of shrinking. The amount of water given to PGSL in the experiment was significantly greater than the amount of water that was theoretically needed for it.…”

Section: Rate Of Size Change At 28 Dmentioning

confidence: 77%

“…Generally speaking, the theoretical water requirement of CaSO 4 -0.5H 2 O is only 18.6% of its weight. Still, in the production process of gypsum self-leveling, the actual amount of water added is much more considerable than its theoretical water requirement, which makes the excess water retained inside the gypsum slurry and precipitated as water vapor with the hydration process of gypsum, which leads to the emergence of many pores inside the gypsum [29]. Generally, pores with pore sizes >200 nm significantly influence gypsum properties [35].…”

Section: Pore Structurementioning

confidence: 99%

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Effects of Sodium Gluconate on the Fluidity and Setting Time of Phosphorus Gypsum-Based Self-Leveling

Shen,

Ding,

Chen

et al. 2023

Buildings

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To comprehensively utilize industrial by-products of gypsum while reducing the consumption of natural river sand, this experiment was conducted to prepare gypsum-based sandless self-leveling (PGSL) materials by using phosphorus-building gypsum (PBG) and portland cement (PC) as gelling raw materials with the addition of polycarboxylate superplasticizer (PCE), cellulose ethers (CE), and retarders. However, employing phosphogypsum as the source material results in a significant 30 min fluidity loss in the gypsum-based self-leveling system. Therefore, to enhance the flow characteristics of gypsum self-leveling, sodium gluconate was chosen for usage in this research. The impact of single and compound mixing of protein-based retarder (PR) and sodium gluconate (SG) on gypsum-based sandless self-leveling materials was evaluated in terms of heat of hydration analysis, pore structure, fluidity, strength, and setting time. According to the experimental findings, it was possible to considerably decrease the fluidity loss of gypsum-based sandless self-leveling materials, postpone the setting time, boost strength, and enhance pore structure when combined with 0.4% SG and 0.03% PR.

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Section: Rate Of Size Change At 28 Dmentioning

confidence: 77%

Section: Pore Structurementioning

confidence: 99%