CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Min Wei,Yufei Tang,Lei Chen,Bo Zhang,Shitong Zhang,Kang Zhao,Zixiang Wu
Calcium phosphate cement (CPC) has received extensive attention as a filler for heteromorphic bone defects owing to its excellent biocompatibility, self-curing property, and degradability. However, the low strength and poor anti-washout properties still restrict the use of CPC in the clinical application. In this study, montmorillonite (MMT) was introduced into CPC to prepare CPC/MMT composite bone-cement. The compressive strength of the composite cement was synergistically enhanced by increasing intermolecular bonding and the impeding crack propagation . Owing to its unique lamellar structure , viscosity, and hydrophilicity, CPC bound to MMT via the bridging effect of water molecules and the electrostatic interaction between MMT and Ca 2+ . When subjected to an applied load, crack propagation was further hindered by MMT pull-out, load transfer, crack deflection, crack branching, and crack bridging, which consuming more fracture energy, significantly improving the compressive strength of the cement strength. At 50 wt% MMT addition, the compressive strength of the composite bone cement (CPC+50%MMT) was 48.5 MPa, which is 227.04% higher than that of CPC alone (14.83 MPa). Surprisingly, the anti-washout ability of CPC was significantly improved, as indicated by the decrease in the mass loss of the composite bone cement from 71.25 to 6.48%, overcoming the trade-off between strength and anti-washout properties. The final setting time was shortened from 22 to 11.37 min, and the injectability exceeded 90%. In addition, the composite bone cement demonstrated outstanding cell adhesion and proliferation abilities, making it a promising material for bone-repair therapy.
研究领域:
生物材料学
·
骨科医学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Runzhuo Cao,Junfen Yang,Guoxin Li,Qun Zhou,Mengdie Niu
Exposure of cement-based structures to sulfuric acid environments can cause significant degradation. Therefore, this study focuses on the effect of nano-SiO 2 on the sulfuric acid resistance of ordinary Portland cement (OPC)-sulfoaluminate cement (SAC) composites (as repair material). Samples were exposed to three concentrations of acid solution. The degradation kinetics, chemistry, and microstructures of the composites were analyzed. The results of degradation kinetics (dimensional change, mass and strength loss) showed that the nano-SiO 2 modified composites had a lower degradation rate compared to the composites without nano-SiO 2 . XRD, TG, MIP and SEM analyses demonstrate that nano-SiO 2 promoted hydration and improved structural compactness, which can not only enhance the diffusion resistance of composites to H + and SO 4 2- , but also form a protective barrier in acid environments. However, diffusion–dissolution-precipitation is still the main mode of degradation in composites subjected to sulfuric acid attack, regardless of nano-SiO 2 content mixed into the composite system.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Xiaona Huang,Hao Zhang,Xuguang Wang,Xiutian Yang,Rongzhuang Lin,Fan Zhang,Ying Liu,Kun Xu,Chao Zhou,Pixin Wang
During cementing construction, H 2 S gas leak from micro-cracks of cement ring or cementing interface, seriously damaging wellbore integrity and shortening the life of wells. Therefore, microcrack self-healing cement technology is of great significance for oil wells to maintain the durability of cement rings and adapt to complex underground environments. Herein, acrylamide (AM), acrylonitrile (AN) and N-vinylformamide (NVF) were used as functional monomers , and laponite was added to prepare Laponite-poly(acrylamide-acrylonitrile-n-vinylformamide) nanocomposite hydrogel (L-PMAN) with excellent mechanical strength as micro-crack repair agent for gas-triggered cementing cement sheath. Considering the difference of chemical environment in the process of wellbore cement slurry sealing and subsequent micro-fracture plugging, different structural units were selected to design amphoteric structure. The construction of zwitterionic structure makes it exhibit excellent swelling behavior in salt solution while maintaining 80% of the original mechanical strength. More importantly, after adding L-PMAN powder,cement stone (C 1 ) can achieve good repair of microcracks under the trigger of H 2 S within 3 days, and the maximum gas breakthrough pressure can reach 2.5 MPa, indicating the great potentials of the L-PMAN for plugging microcracks in cement sheath.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Guoxin Li,Qingfeng Liu,Mengdie Niu,Li Cao,Bing Nan,Chen Shi
Nanosilica (NS) with ultra-fine structure and high pozzolanic activity frequently used to reinforce cement-based materials. In this study, NS was selected to modify CSA-OPC blends to meet the critical engineering properties of rapid repair materials, such as fast setting hardening, high early strength and sustainable late strength. The effects of NS on the setting time, mechanical strength, phase and mass change of hydrates and pore structure of binary blends were investigated. Results indicated that NS largely shortens the setting time. The remarkable enhancement in the early strength compared to other substitution levels by adding 1.0wt. %NS, and the sustainable late strength was maintained. XRD and TG-DTA demonstrate that ettringite was the main hydrate and its content evidently increase with the inclusion of NS. Furthermore, SEM micrographs was observed that NS effectively improves the binding between the hydrates. The utilization of NS resulted in less porosity and more homogeneous binary mortar as seen in MIP test.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2025
·Vol. 13
·期 3
·922
·
IF 2.8
Xu Chen,Xiangpeng Zhu,Cheng Gan,Yigang Li,Diren Liu
The stability of cement slurries under high-temperature conditions poses a significant engineering challenge in cementing operations. This study explored the development of a novel tetrameric thermosensitive thickening polymer (TTSTC) as a solution to this problem. Aqueous free radical polymerization was employed to synthesize the polymer. The base monomers 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and acrylamide (AM) were employed, in conjunction with the long-chain thermosensitive monomers octadecyldimethylallylammonium chloride (C18DMAAC) and N-vinylpyrrolidone (NVP). The optimal synthesis conditions were determined by orthogonal experiments as follows: monomer molar ratio (AM:AMPS:C18DMAAC:NVP) = 15:10:5:5, initiator concentration of 16 wt%, cross-linker concentration of 0.45 wt%, pH 6, and polymerization temperature of 60 °C. The chemical structure of TTSTC was characterized by Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance (1H-NMR), gel permeation chromatography, scanning electron microscopy, Zeta potential, and particle size measurement. The results verified the successful synthesis of the target polymer. Its thermal stability, thermosensitive thickening behavior, and salinity resistance were systematically investigated. Furthermore, the impact of TTSTC on the settling stability, rheological characteristics, and compressive strength of cement paste was assessed. The experimental findings demonstrated that TTSTC displayed noteworthy thermosensitive thickening properties at temperatures up to 279 °C, pH values ranging from 11 to 13, and NaCl/CaCl2concentrations between 0.05 and 0.5 g/L. The optimal performance of TTSTC was observed at mass fractions ranging from 0.6 to 0.8 wt%. When incorporated into the slurry at 0.6–1.0 wt%, TTSTC significantly improved the slurry settling stability, thickening properties, and 28d compressive strength at elevated temperatures compared with the control. When comparing the temperature-sensitive thickening performance of the newly developed treatment agent with that of the commercially available xanthan gum thickener, the results showed that for the cement slurry system containing the new treatment agent at a mass fraction of 0.6%, the reduction in consistency was 30.9% less than that of the cement slurry system with xanthan gum at a mass fraction of 0.6%. These findings indicate that TTSTC has the potential to function as a highly effective additive in cementing operations conducted in extreme environments, thereby enhancing the stability and dependability of such operations.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 5
·102
·
IF 3.553
Jinfeng Sun,Zhiqiang Xu,Weifeng Li,Xiaodong Shen
The impact of nano-SiO2on the early hydration properties of alite-sulphoaluminate (AC$A) cement was investigated with a fixed water to solid ratio (w/s) of one. Nano-SiO2was used in partial substitution of AC$A cement at zero, one and three wt %. Calorimetry, X-ray diffraction (XRD), thermogravimetric/derivative thermogravimetric (TG/DTG), mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) analyses were used to characterize the hydration and hydrates of the blended cement. The hydration of the AC$A cement was significantly promoted, resulting in an increase of the heat released with the addition of nano-SiO2. Phase development composition analysis showed that nano-SiO2had no effect on the type of crystalline hydration products of the AC$A cement. Moreover, nano-SiO2showed significant positive effects on pore refinement where the total porosity decreased by 54.09% at three days with the inclusion of 3% nano-SiO2. Finally, from the SEM observations, nano-SiO2was conducive to producing a denser microstructure than that of the control sample.Keywords:nano-SiO2;AC$A cement;early hydration;properties
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 9
·2076
·
IF 5
Hongping Zhang,Pengfei Tang,Youhong Tang,Kun Yang,Qingyuan Wang
The penetration of external stimuli (microorganisms, ions, etc.) following to the pore is the key reason for the deterioration of cement and concrete structures. Although the traditional methods such as improving the chemical composition of cement and concrete materials can delay the erosion rate, the inevitable pore structure still makes its deterioration a challenge. Based on this, we reported a protective coating for cementitious materials based on phenol and Ti3C2MXene-modified polyacrylate (MXene-PG/PA). The introduction of phenols enhanced the waterproof properties of polyacrylate by increasing the interaction among molecular chains. Moreover, the introduction of Ti3C2MXene also endows the MXene-PG/PA coating with good light-induced antimicrobial properties. Beneficial to these designs, the MXene-PG/PA coating exhibited good waterproof properties (the water absorption ratio in seawater decreased by 58.2%) and antimicrobial properties (inhibition ofE. coliandS. epidermidisactivity under light). These results not only confirm that the MXene-PG/PA coating is a potential candidate of protective coating for cement-based materials, but also provide a new strategy for the design of multifunctional protective coatings.Keywords:protection coating;Ti3C2MXene;waterproof;antimicrobial;cement-based materials
研究领域:
材料科学
·
环境工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Metals
·
2023
·Vol. 13
·期 2
·250
·
IF 2.9
Hui Ge,Zhigang Pan,Feng Xie,Diankun Lu,Wei Wang,Shulin Wu
The jarosite residue is a harmful byproduct of the zinc hydrometallurgical process and has been classified as hazardous waste due to its high content of heavy metals and poor stability. In this work, the recovery of valuable metals by synergistic disposal of jarosite residue with cement kiln has been investigated. A series of investigations were undertaken to assess the effect of amount of jarosite residue, roasting time, and the addition of CaCl2on phase transformation and migration of valuable elements in the cement clinker. When 25% of jarosite residue was added to the raw cement materials and roasted at 1400 °C for 30 min, the silicate content in the cement clinker reached 54.4%. In the presence of CaCl2as the mineralizer, the volatilization rates of Pb and Zn were 93% and 75%, respectively. The results indicated that jarosite residue can be used as the cement additive and valuable metals of Pb and Zn can be recovered simultaneously during the roasting process.Keywords:jarosite residue;cement;Pb and Zn;synergistic roasting
研究领域:
环境科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
Regenerative Biomaterials
·
2024
·
IF 5.6
Xie Lijun,Zhang Yan,Cao Binji,Jiao Xiaoyi,Yue Xusong,Xu Yan,Yang Xianyan,Yang Guojing,Wang Yingjie,Shen Jian,Wang Cong,Weng Xisheng,Gou Zhongru
It is known that magnesium phosphate cements (MPCs) show appreciable mechanical strength and biocompatibility, but the hydration reaction processes often lead to intense heat release while the hydration products present weak resistance to mechanical decay and low bioactivity. Herein we developed an MPC-based system, which was low-heat-releasing and fast-curing in this study, by compounding with self-curing calcium silicate cements (CSCs). The MPC composed of magnesium oxide (MgO), potassium dihydrogen phosphate (KH2PO4), disodium hydrogen phosphate (Na2HPO4), magnesium hydrogen phosphate trihydrate (MgHPO4·3H2O) and chitosan were weakly basic, which would be more stable in vivo. The physicochemical properties indicated that the addition of CSCs could increase the final setting time while decrease the heat release. Meanwhile, the CSCs could endow MPC substrate with apatite re-mineralization reactivity, especially, which add 25 wt.% CSCs showed the most significant apatite deposition. What’s more, the mechanical evolution in buffer demonstrated CSCs could enhance and sustain the mechanical strength during degradation, and the internal constructs of cement implants could still be reconstructed by μCT analysis in rabbit femoral bone defect model in vivo. Particularly, appropriate CSCs adjusted the biodegradation and promoted new bone tissue regeneration in vivo. Totally, the MPC/CSCs composite system endows bioactivity and sustain mechanical strength of the MPC, which may be promising for expending the clinical applications of MPC-based bone cements.
研究领域:
材料科学
·
生物材料
·
生物医学工程
·
骨科
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Silicon
·
2025
·
IF 3.3
Li Xuejie,Peng Zhigang,Feng Qian,Zheng Yong,Zhang Xiaofeng,Zhang Haojun,Long Yu,Zhang Yunao,Zhou Jun
To address the excessive retardation of oil well cement caused by polycarboxylate dispersants (PCE), this study synthesized a zwitterionic polycarboxylate dispersant (DPC). Its molecular structure and weight were characterized using 1 H nuclear magnetic resonance and gel permeation chromatography, respectively. The dispersion effect of DPC in cement slurries was evaluated by analyzing microstates, particle size distribution, Zeta potential, and rheological properties, and compared with acetone formaldehyde sulfite condensates (AFS) and conventional anionic polycarboxylate dispersants (CPC). The influence of DPC on cement hydration was studied through thickening performance, compressive strength, semi-adiabatic calorimetry, and X-ray diffraction. DPC effectively disrupted particle flocculation in cement slurry, reducing the median particle size from 34.4 μm to 10.2 μm. At a dosage of 0.20%, the slurry with DPC exhibited superior flowability compared to CPC and AFS. DPC induced Newtonian fluid behavior with weaker thixotropy and significantly reduced retardation effects. The 24-h compressive strength of cement stones reached 39.7 MPa, the thickening time was about 83 min, and the hydration heat peak occurred earlier. Adsorption studies indicated that DPC disperses through steric hindrance and the synergistic anchoring effects of cations and anions. Overall, DPC demonstrates high dispersibility and lower retardation, making it a promising additive for oil and gas well cementing.
研究领域:
石油工程
·
材料科学
·
高分子化学
·
水泥技术
·
流变学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Guangxu Ju,Danqian Wang,Yingzi Gu,Weining He,Yiming Niu,Guoxing Sun
Good thermal insulation performance is crucial for the application of cement materials, and reducing thermal conductivity is an effective strategy to enhance thermal insulation performance. Thermosensitive poly-N-isopropylacrylamide (PNIPAM) undergoes a phase transition around its lower critical solution temperature (LCST) of approximately 32 °C, and its incorporation can significantly improve the thermal insulation properties of cement. This study investigates the effects of adding PNIPAM in concentrations ranging from 0.3 % to 1.5 % on the thermal conductivity of cement-based materials at temperatures of 25 °C, 32 °C, and 37 °C. At 37 °C, the thermal conductivity of the cement sample decreased from 1.728 W/m·K to 0.811 W/m·K, representing a substantial reduction of 53.05 %. However, increasing the PNIPAM content also affected the hydration process of the cement mortars, leading to longer initial and final setting times and a slight decrease in both compressive and flexural strength. Additionally, the viscosity of the PNIPAM solution increased the overall viscosity of the cement mortar, resulting in reduced fluidity.
研究领域:
建筑材料学
·
热物理
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2022
·Vol. 194
·期 5
·1-10
·
IF 3.307
Yang Nan,Ge Zhimeng,Li Aihong,Wei Baiyong,Li Yinming,Zhang Ye,Shen Qianjin,Wang Tuqiang,Wu Xueqian,Cao Xiangdong,Guo Jianping,Wang Zhaojia
The municipal solid waste incineration (MSWI) fly ash has been a major problem with the rapid development of the cities in China. And the cement rotary kiln co-processing technique is accepted as an effective method to dispose detrimental heavy metals in MSWI fly ash. This study focused on presented the total leaching content and the morphological distribution of the heavy metals in cement solid samples doped with MSWI fly ash. These samples were collected from a MSWI fly ash co-processing cement rotary kiln plant. The leaching test and the sequential extraction procedure were adopted to measure the migration characteristic of As, Pb, Cu, and Zn. In addition, the leachability of clinker samples under different simulated environmental conditions was also detected to analyze the security of the cement product doped with MSWI fly ash. This work demonstrates the feasibility of the cement rotary kiln MSWI fly ash co-processing technique and provides a scientific guidance to related plant.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）