Huahui Qi

Huahui Qi
Wuhan University of Technology | WHUT · School of Materials Science and Engineering

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19
Publications
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Publications

Publications (19)
Article
Effect of alpha-hemihydrate phosphogypsum (α-HPG) prepared from phosphogypsum (PG) on the properties of beta-hemihydrate phosphogypsum (β-HPG) pastes was studied systematically. The results showed that α-HPG with a specific length to diameter ratio of 1:1 could improve the workability, strength and water resistance of β-HPG, and the improvement was...
Article
Both sodium carbonate (NC) and sodium phosphate (NP) could immediately precipitate in the presence of calcium ions (Ca²⁺), and these precipitates would deposit on the surface of cement as one layer in cement paste. However, these precipitates have different effects on the hydration of cement. In this study, effect of NC and NP on cement hydration w...
Article
Impurities in phosphogypsum have a significant impact on its properties and the performance of admixture. This study aims to reveal the influence of fluoride ion (F⁻) on the performance of polycarboxylate superplasticizer (PCE) in hemihydrate gypsum pastes. By introducing F⁻ into the natural hemihydrate gypsum - PCE system, workability, mechanical...
Article
Beta-hemihydrate phosphogypsum (β-HPG) as a cementitious material can be used for the preparation of lightweight gypsum to facilitate the utilization of phosphogypsum (PG) and reduce the energy consumption of buildings. In this work, expanded polystyrene (EPS) particles as lightweight aggregates were mixed with β-HPG during the preparation process....
Article
Phosphogypsum (PG) is an industrial solid waste which is difficult to dispose of and can cause environmental pollution. This paper investigated a low-energy-consumption preparation from PG of an environmentally friendly building material. PG was converted to α hemihydrate gypsum (α-HH) using the nonautoclaved method. Then the α-HH from PG (PGHH) wa...
Article
In this study, 2-hydroxylethyl methacrylate phosphate was introduced as side chain to modify polycarboxylate superplasticizers (PCEs), and its performance in gypsum paste was systematically investigated. The results show that the introduction of phosphate ester can increase the water reduction ratio from 24% to 58%, and also extend the final settin...
Article
Turmeric residue, a solid waste discharged from the curcuminoids industry, is difficult to recover due to high concentrations of strong acids, organic solvents, and plant fibers. In this study, organic turmeric residue was used as the main raw material for the preparation of ceramic foam, in comparison with inorganic granite scraps. The bulk densit...
Article
Beta-hemihydrate phosphogypsum (β-HPG) as a cementitious material obtained from the dehydration of phosphogypsum (PG) can be widely used for the preparation of building materials. The main problems for its utilization are its low mechanical strength and poor waterproof properties. In this study, calcium sulphoaluminate cement (SAC) was used to impr...
Article
Sodium gluconate (SG) has been accepted as one of the main additional components in polycarboxylate superplasticizer (PCE) system, due to its excellent retarding effect. While the negative effect on dispersion of PCE was reported in the literature, the reason was not completely revealed. In this study, molecular dynamics simulation was used to inve...
Article
This paper investigates effect of colloidal nano-SiO2 (CNS) on chloride immobilization of cement-fly ash (FA) system composed of 70% cement and 30% FA from 7 d to 90 d age. The mechanism is revealed in terms of migration resistance, chemical binding, and physical binding; and each aspect is determined with corresponding measurements, including micr...
Article
Polycarboxylate superplasticizer (PCE) and aliphatic superplasticizer (AS) are widely used water-reducing agent in concrete. In actual practice, the addition of AS has been developed as a common way to alleviate the bleeding and segregation of concrete plasticized by PCE, while the main reason for this phenomenon is not clear. In this research, the...
Article
The problem of bleeding and segregation in high fluidity concrete can be eliminated by the addition of viscosity-enhancing agents (VEA). However, the dispersion capacity of PCE would be perturbed by the addition of VEA. In most cases, this negative impact was due to competitive adsorption between VEA and PCE. In order to mitigate the negative impac...
Article
This study investigated the effects of amorphous aluminum hydroxide (AAH) on chloride ions immobi-lization ability of cement-based materials. Paste samples with different dosages of AAH were prepared, and the chloride binding capacity was examined. Hydrates at the age of 7 d and 28 d were analyzed by X-ray diffraction (XRD), thermo-gravimetric anal...
Article
This paper aims to investigate the effect of triisopropanolamine (TIPA) on compressive strength and hydration of cement-fly ash paste. The samples with various dosages of TIPA were prepared with 30% fly ash (FA) and 70% cement (water/binder ratio by weight = 0.38), and cured under the standard condition. The compressive strength, pore structure, hy...
Article
Full-text available
Utilization of sea sands and coral aggregate for concrete in ocean construction is increasingly attracting the attention all over the world. However, the potential risk of steel corrosion resulting from chloride in these raw materials was one of the most concerned problems. To take this risk into account, chloride transporting to the surface of ste...
Article
Formation of Friedel’s salt (FS) and Kuzel’s salt (KS) can chemically bind chloride in cement-based materials, and in cement-fly ash system, this can be facilitated by the pozzolanic reaction of fly ash (FA), with obvious contribution to the chloride binding capacity. In this study, FA was pretreated with alkali solution in order to depolymerize th...
Article
Generally, bleeding and segregation can be solved with addition of hydroxypropyl-methyl cellulose ether (HPMC) in real concrete. However, the negative effect of this on dispersion of polycarboxylate superplasticizer (PCE) can always be found. In order to deeply understand this negative effect, the rheology of cement paste in the presence of PCE and...
Article
The influence of nano-SiO2 (NS) and basalt fiber (BF) modified cementitious coatings on chloride permeability in concrete and the influence mechanism explored by differential scanning calorimetry thermogravimetry (DSC-TG), X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) was studied. Results show t...

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Project (1)
Project
To find the mechanism behind the improvement of rheological performance of cement-based materials