Effect of collagen hydrolysate obtained from leather waste on the setting, hydration and crystallization process of gypsum

Ding, Xiaoxia; Wei, Bangquan; Dai, Rui; Chen, Hui; Zhi-hua, Shan

doi:10.1016/j.jiec.2022.02.047

Cited by 11 publications

(3 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The strength enhancement effect was best when the lithium carbonate doping was increased to 0.18%, and the 3 h strength reached 15.4 MPa. Viscosity reflects the magnitude of viscous resistance to fluid flow; the lower the viscosity of the slurry, the better its injectability [32,33]. The curves of the viscosity and temperature of the B liquid with the hydration time are shown in Figure 4.…”

Section: Effect Of Early Strength Agent On Sacdl Strengthmentioning

confidence: 99%

“…The curves of the viscosity and temperature of the B liquid with the hydration time are shown in Figure 4. The hydration of CaSO 4 •0.5H 2 O is an exothermic process, and the viscosity and temperature can both respond to the degree of CaSO 4 •0.5H 2 O hydration while the time-varying characteristic curves of the two basically remain the same [32][33][34]. According to the viscosity, the changes can be divided into "thickening period", "false solidification", and "stabilization" of the three stages of the hydration reaction of the B liquid.…”

Section: Effect Of Early Strength Agent On Sacdl Strengthmentioning

confidence: 99%

See 1 more Smart Citation

Study on Early Hydration Mechanism of Double-Liquid Grouting Material Modified by Composite Early Strength Agent

Chen,

Wang,

Jiao

et al. 2023

Materials

View full text Add to dashboard Cite

To achieve an adjustable setting time and significantly improved early strength of a new type of sulphoaluminate cement-based double-liquid grouting material (SACDL), the effects of calcium formate, sodium sulfate, lithium carbonate, and a composite early strength agent on the setting hardening and early hydration behavior of SACDL paste were studied by means of setting time, fluidity, compressive strength, and viscosity tests. The results showed that the adsorption and osmosis of calcium formate, the complex decomposition of sodium sulfate, the precipitation polarization of lithium carbonate and the synergistic action of the composite early strength agent could accelerate the early hydration rate of SACDL, shorten the coagulation time, and improve the early strength of SACDL. The composite effect of 0.8% calcium formate and 0.5% sodium sulfate is the most significant in promoting coagulation and early strength; the initial setting time and final setting time of the slurry were shortened to 5 min and 10 min, respectively; and the 3 h compressive strength was capable of reaching 16.7 MPa, 31% higher than that of the blank group. In addition, X-ray diffraction and SEM morphology observation were used to study the composition of the hydration products and the evolution of the microstructure, which revealed the early hydration mechanism of SACDL under the synergistic effect of the composite early strength agent: (1) The solubility of tricalcium aluminate (C3A) and dihydrate gypsum (CaSO4·2H2O) increased under the low content composite early strength agent condition, which increased the ettringite (AFt) formation rate. HCOO− was able to penetrate the hydration layers of tricalcium silicate (C3S) and dicalcium silicate (C2S), accelerating the dissolution of C3S and C2S and promoting the early hydration of SACDL. (2) Under the condition of a high dosage of the composite early strength agent, the further increase in Ca2+ concentration promoted the crystallization nodules and precipitation of CH and accelerated the formation of calcium silicate hydrate (C-S-H) gel. C-S-H was filled between a large number of rod-like AFt crystals, thus making the structure more dense.

show abstract

Section: Effect Of Early Strength Agent On Sacdl Strengthmentioning

confidence: 99%

Section: Effect Of Early Strength Agent On Sacdl Strengthmentioning

confidence: 99%

Study on Early Hydration Mechanism of Double-Liquid Grouting Material Modified by Composite Early Strength Agent

Chen,

Wang,

Jiao

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…A known method includes washing the waste with water, modification with a mixture of reagents that form coordination complexes with trivalent chromium ions, washing with water, modification with an oxidizing mixture to transform 𝐶𝑟 3+ into a soluble form 𝐶𝑟 6+ , additional washing water, purification and deionization from 𝐶𝑟 6+ [27]. According to another method, after washing the waste with water, acid modification is performed, then modification with an oxidizing mixture consisting of a 2% solution of caustic soda and perhydrol, washing with running water until the chromium oxide content in the waste is 0.4% [28]. Processing of chrome chips in an oxidizing solution is carried out at a temperature of 18-20 o C, liquid coefficient equal to 5, for 15-20 minutes of periodic stirring [29].…”

Section: Introductionmentioning

confidence: 99%

Modified Fibrous Mass of Leather and Paper Waste for the Production of Packaging Paper and Cardboard

Rafikov,

Kadirova,

Jurayeva

2024

Text Leather Rev

View full text Add to dashboard Cite

Recycling leather waste, which accumulates in large quantities in tanneries, and producing packaging paper with improved properties reduces the environmental burden and is at the same time economically efficient. A modified fibrous mass of waste from tanned and untanned leather scraps, waste paper, and acrylic emulsion was obtained and packaging paper based on them was produced. Alkaline modification of tanned leather waste - chrome shavings - leads to an increase in the electrokinetic potential and, accordingly, the stability of the fibrous suspension, partial hydrolysis of skin collagen occurs with the formation of new polar groups, and at the same time, the degree of cross-linking of the skin increases. In the paper composition, new intermolecular bonds are formed between cellulose and skin collagen. The microstructure, elemental composition, morphology, thermal and physical-mechanical properties of modified chrome shavings and composite paper were determined. A significant improvement has been achieved in the main parameters of paper: surface density (decrease by 16-25%), breaking load and breaking length (increase by 15-23%), number of double bends (increase by 2-6 times) in comparison with paper obtained from pure waste paper, and also to a greater extent compared to paper obtained from unmodified leather waste.

show abstract

Revolutionizing Construction: Harnessing Phosphorus Tailings for Lightweight, High‐Strength Wall Materials

Wang,

Zhang,

Cao

et al. 2024

Cryst. Res. Technol.

View full text Add to dashboard Cite

The beneficiation of low‐grade phosphate ore leads to the production of a substantial quantity of phosphate tailings, thereby not only occupying land but also endangering the environment and potentially posing safety concerns. In this work, extrusion molding, steam‐curing, and calcined phosphate tailings are employed to fabricate lightweight wall materials with superior strength. It is found that the wall material has a special structure of interwoven needle‐like crystals as a way to provide high flexural strength. The main composition of 34.94% phosphate tailings, 36.75% calcined phosphate tailings, 16.64% silica fume, 6.67% anhydrous magnesium sulfate is required to achieve an optimal maintenance process for 4 h of heat preservation at 120 °C saturated vapor pressure environment. The prepared wall materials yield a flexural strength of 24.9 MPa, compressive strength of 18.9 MPa, softening coefficient of 0.81, apparent density of 1.594 g cm−3, and thermal conductivity of 0.269 w/(m K), which meet the requirements of the Chinese standard “Lightweight strip board for building partition walls”. Moreover, the calculation revealed that phosphate tailings have a comprehensive utilization rate of 77.23%, effectively mitigating the issues arising from their accumulation and serving as an efficient means of utilizing solid waste derived from phosphate tailings.

show abstract

Effect of collagen hydrolysate obtained from leather waste on the setting, hydration and crystallization process of gypsum

Cited by 11 publications

References 34 publications

Study on Early Hydration Mechanism of Double-Liquid Grouting Material Modified by Composite Early Strength Agent

Study on Early Hydration Mechanism of Double-Liquid Grouting Material Modified by Composite Early Strength Agent

Modified Fibrous Mass of Leather and Paper Waste for the Production of Packaging Paper and Cardboard

Revolutionizing Construction: Harnessing Phosphorus Tailings for Lightweight, High‐Strength Wall Materials

Contact Info

Product

Resources

About