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
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环境工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
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
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Linan Gu,Tiejun Liu,Kai Wu,Zhenghong Yang,Zhaoyin Wen,Zhenlei Zhang,Haoxin Li
It is still uncertain whether temperature exerts some influence on the water retention (WR) and bleeding of cement-based materials with viscosity-enhancing admixtures (VEAs). Thus, WR and bleeding of cement-based materials with selected VEAs, such as sodium polyacrylate (PANA), hydroxyethoxy methoxy cellulose (HEMC) and hydroxypropoxy methoxy cellulose (HPMC), were evaluated at 20, 30, 40, 50, and 60 °C, and experiments on the apparent viscosity , total organic carbon (TOC) content, hydrodynamic radius and thermogravimetry were carried out to explore the responsible mechanisms. The results show that VEAs enhance WR and reduce bleeding at room temperature to varying degrees. However, this improvement at higher temperature does not occur as at room temperature (20 °C). The decreased improvements in WR and bleeding at higher temperature are associated with the lowered apparent viscosity , TOC content, hydrodynamic radius and the increased cement hydration . Below 40 °C, the apparent viscosity, adsorption and hydrodynamic radius dominate the bleeding behaviour of mortars with HPMC and HEMC. However, accelerated cement hydration is mainly responsible for the behaviour when the temperature exceeds 40 °C.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 12
·2880
·
IF 3.1
Chenhao He,Xiangguo Li,Yang Lv,Jianming Dan,Haitian Yan,Xiangqin Shi
Thermal storage cement-based materials, formed by integrating phase change materials into cementitious materials, exhibit significant potential as energy storage materials. However, poor thermal conductivity severely limits the development and application of these materials. In this study, an amorphous SiO2shell is encapsulated on a graphite surface to create a novel thermally modified admixture (C@SiO2). This material exhibits excellent thermal conductivity, and the surface-encapsulated amorphous SiO2enhances its bond with cement. Further, C@SiO2was added to the thermal storage cement-based materials at different volume ratios. The effects of C@SiO2were evaluated by measuring the fluidity, thermal conductivity, phase change properties, temperature change, and compressive strength of various thermal storage cement-based materials. The results indicate that the newly designed thermal storage cement-based material with 10 vol% C@SiO2increases the thermal conductivity coefficient by 63.6% and the latent heat of phase transition by 11.2% compared to common thermal storage cement-based materials. Moreover, C@SiO2does not significantly impact the fluidity and compressive strength of the thermal storage cement-based material. This study suggests that C@SiO2is a promising additive for enhancing thermal conductivity in thermal storage cement-based materials. The newly designed thermal storage cement-based material with 10 vol% C@SiO2is a promising candidate for energy storage applications.
研究领域:
建筑材料
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能源材料
·
热力学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Chen Jixi,Jia Jinqing,Zhu Mengyu
Water film thickness (WFT) has been discovered to significantly affect the performance of cement-based materials in previous studies. The purpose of this study is to apply the WFT theory to cement-based materials with early-strength agents. To this end, calcium chloride (CaCl 2 ) and triethanolamine (TEA) were used to prepare 32 groups of fresh pastes with varying water-cement ratios and different dosages of CaCl 2 /TEA. These pastes were tested for flow performance, setting time, and hardening performance. The comprehensive effects of WFT and early strength agents on the mobility and hardened properties of cement-based materials were discussed from the obtained results. Results show that WFT is still one of the main elements affecting the performance of cement-based materials in the presence of early strength agents. CaCl 2 increased the packing density of the paste, enhancing the excess water between particles and enlarging the WFT, which positively impacted the performance of the paste. In contrast, TEA decreased the WFT, increased the cohesion between particles, and declined the fluidity. Furthermore, as the water-cement (w/c) ratio raised, the WFT of the paste also increased. This caused cement particles to be enveloped in excess water, improving slip capacity and consequently increasing fluidity but reducing strength. Overall, WFT and admixture dosage can effectively predict the fluidity and mechanical properties of the paste.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Nan Chen,Shengtao Gao,Zijian Zong,Yingyu Wang,Dejin Xu,Chuanlei Zhu,Peiyuan Chen
This paper proposes using coal gangue powder (CGP) as an alternative to silica fume (SF) in cement-based systems, towards to high-value recycling of this coal waste. In cement-based systems, CGP offers a more affordable substitute for SF as a supplementary cementitious material. Mechanical activation enhances CGP’s reactivity by inducing structural disorder and increasing surface area, which facilitates its participation in hydration reactions. Additionally, its water retention capacity contributes to prolonged hydration and improved microstructural densification. Employing techniques such as BET analysis, rheological testing, XRD, TG-DTG, hydration kinetics, compressive strength and nanoindentation, the research compares the effects of CGP and SF on paste properties. The results indicate that SF increases plastic viscosity by 9.18 %–30.61 % and enhances compressive strength by 4.68 % at 28d, while CGP-added pastes show slight plastic viscosity to gain more distinctive rheological properties. CGP-added pastes demonstrate a comparable cumulative mass loss in TG-DTG, highlighting its positive impact on cement hydration. Additionally, CGP modifies the pore structure, increasing gel pore volume at lower dosages while maintaining a balanced distribution at higher dosages. These findings suggest that mechanically activated CGP can partially replicate SF’s effects on hydration and microstructural refinement, providing a sustainable and economical approach to enhancing cement-based materials.
研究领域:
建筑材料学
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资源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 7
·1626
·
IF 3.2
Kaiyue Huang,Ji Zhang,Yue Li,Hui Yang
Surface treatment is essential for cementitious materials. Siloxane is a material that can potentially be applied in surface treatment, as it possesses the advantages of both inorganic and organic surface treatment materials for cement. Organotin, serving as a neutral catalyst, performs well in improving the performance of siloxane coating. In this work, the effect of organotin on the surface treatment performance of siloxane was studied for application in cementitious materials, including surface hardness and waterproofing properties. Organotin had little effect on the waterproofing of cement paste treated with siloxane. However, the addition of organotin positively impacted the surface hardness of cement paste treated with MTMS, which increased by 105.1%. The function of organotin was analyzed through XRD, FTIR, SEM, and pore structure characterizations. Organotin can speed up the gelation of siloxane, thus consuming more portlandite in cement. The negative effect of the alkyl group could be partially reduced by promoting the condensation of the alkoxy group. This indicated that treating siloxane with organotin is valuable for improving the durability of cement-based materials, increasing their surface hardness without affecting waterproofing.
研究领域:
建筑材料
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hang Diao,Bo Peng,Wenjing Kuang,Tianqing Ling,Ying Gao,Shaohua Lu,Chenyang Wang,Jing Tian,Xinyuan Wang
The increasing NO pollution caused by the aggregation of urban automobile exhaust emissions has created an urgent need to develop a sustainable cement-based material that can remove NO. This study developed a Fe-TiO 2 /g-C 3 N 4 photocatalyst with high NO removal rate by using Fe-TiO 2 to enhance the ability of photogenerated electrons captured by the conduction band, and the heterojunction formed by the composite with g-C 3 N 4 to promote the charge separation and transport. Excellent sustainability was achieved with a NO removal rate of 52.3 % in a single test and a decay of only 5 percentage points in a 5-cycle test. Combination of the prepared photocatalyst and diatomite in the design of the photocatalytic cement-based material showed excellent NO removal performance and mechanical properties. The incorporation of diatomite increased the proportion of harmless pores, improved the microporous structure without degrading the mechanical properties, and enhanced the hygroscopicity of the photocatalytic cement-based materials (up to 21.76 %), which ensured the high efficiency of the photocatalytic NO removal process. Removal of NO from the cement blended with photocatalyst and diatomite was as high as 56.74 %, which was more than 20 % higher than that of the cement group blended with catalyst alone. The microporous humidity-regulated photocatalytic cement-based materials developed in this study provide a novel NO removal method for cities and can help realize the green development of sustainable cement-based materials.
研究领域:
材料科学
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环境工程
·
催化化学
·
可持续建筑材料
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Fawad Muhammad,Pengkun Hou,Xin Cheng,Zheng Wang,Zhanbin Liu,Surendra P. Shah
Aggressive substances can gain access to the inner structure of cement-based materials through the surface, resulting in deterioration of the structure. This work developed an effective way of improving the quality of cement-based materials surface by applying nanoSiO 2 -/nanoTiO 2 -engineered releasing agents (nSRa/nTRa) on the formwork surface. Continued with our previous work, the positive effects of nSRa/nTRa on cement hydration were used to improve the surface quality of the cement-based samples through its spraying on the mold surface . This work firstly characterized the adhesive properties of these agents on mold surface (contact angle and viscosity measurement), and then their effects on the surface microstructure and the durability of cement-based materials such as 1) sulfate resistance , 2) chloride resistance, and 3) freeze–thaw resistance were determined. Results showed that nanoparticle addition increased the contact angle of releasing agents and helped their adhesion to mold. Applying nSRa/nTRa on cement-based samples benefited the reduction of surface porosity (within 2 mm thick) by 14.2 %, 19.4 %, 8.6 %, and 18.9 % in the nS2Ra-, nS4Ra-, nT4Ra- and nT16Ra-engineered samples. After 120 days of sulfate attack , mortar samples cast in Ra-, nS4Ra-, and nT16Ra-coated molds showed reductions in compressive strength loss of 1.57 %, 0.73 %, and 0.23 %. Noticeable reductions in the chloride migration coefficient of 23.9 % and 26.6 % were found in the nS4Ra-/nT16Ra-modified mortar sample, while their relative dynamic modulus elasticity was 6.72 % and 12 % higher than Ra-sample after 200 freeze–thaw cycles. This work proved that nano-engineered releasing agents can effectively improve the durability of the concrete structure.
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
CEMENT & CONCRETE COMPOSITES
·
2024
·
IF 10.8
Chen Liang,Mingxu Chen,Dongbing Jiang,Pengkun Hou,Deqiang Zhao,Shoude Wang,Ziyuan Yu,Piqi Zhao,Lingchao Lu
Developing hydrophobic agents that minimize the strength loss of bulk hydrophobic cementitious materials (BHCM) remains a formidable challenge. Substances such as siloxanes can hinder cement mineral hydration and prevent the formation of an initial network structure during the early hydration stages. In this study, a novel hydrophobic emulsion in which polydimethylsiloxane (PDMS) wrapped with modified nano silica (MNS) is designed to enhance the hydrophobic property of cementitious materials while minimizing strength loss. The results show that BHCM exhibits good hydrophobicity (water contact angle 121.8°) while significantly reducing strength loss (decreased by 10.3 %). The presence of MNS effectively shields PDMS from direct contact with cement minerals during the initial stages. Moreover, MNS can react with portlandite (CH) to generate C-S-H phase and optimize the pore structure of hardened cement pastes. This study contributes to promoting the structure-function integration of cement composites and achieving an extended service life for concrete.
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
Journal of Building Engineering
·
2024
·
IF 6.7
Dezhi Zhao,Hexiang Wang,Qingxin Zhao,Jinghui Zhang,Lili Yuan
Polypropylene (PP) fiber is widely used for reinforcing cement matrix to improve its cracking resistance , but the poor interaction between two materials caused localized cracks along the fiber thus adverse effect on the fiber reinforced composites . Thus, novel methods for strengthening the fiber-cement matrix interface were proposed in this study. Amidoxime and amine functional groups were successfully grafted onto PP fiber surface through a two-step chelating procedure. XPS , FTIR, iGC-SEA and TG were employed to characterize the modified fibers, and the results verified that the surface treatment significantly improved the surface roughness, specific surface area, hydrophily and thermostability of PP fiber. Moreover, single fiber pullout, uniaxial tensile and three-point bending were conducted to assess the efficiency of surface treatment in enhancing the bonding between fiber and cement matrix, as well as the tensile and flexural strength of composites incorporating PP fibers. The bonding strength was increased by 84.15%–90.08 % and the flexural strength at 28 days was increased by 23.7%–26.4 %. The change in PP fiber surface led to densified fiber-cement matrix ITZ, enhanced chemical bonding and mechanical interlocking thus stronger interaction between fiber and cement matrix. Overall, the proposed surface treatment method is of great potential to be used in producing high performance concrete due to its easy of application and high efficiency.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Xiangshan Hou,Jiayao Zhu,Jingwei Li,Yanhui Liu,Xujiang Wang,Wen Jiang,Wenlong Wang
Safe disposal of nuclear waste is an inevitable requirement for the rapid development of nuclear power. Sulfoaluminate cement (SAC) exhibits excellent performance and potential application in nuclear waste solidification. In this study, a temperature-variable leaching test (90 °C and 25 °C) and an ettringite crystal synthesis experiment were designed to analyze the influence of elevated temperature on SeO 4 2- and CrO 4 2- in SAC matrices. The results showed that, on the one hand, high temperature promoted the oxyanions leaching; on the other hand, it accelerated the early hydration of SAC and subsequently hindered further leaching. The decomposition of ettringite at high temperatures weakened both the physical and chemical solidification mechanisms. Changing from 90 °C condition to 25 °C condition could cause a small amount of ettringite to reform within pores, which significantly inhibited oxyanions leaching. No obvious competitive or induced effects between SeO 4 2- and CrO 4 2- were observed. In SAC matrices, the distributions of Se and S were integrated, whereas Cr tended to be enriched alone. SeO 4 2- tended to mix with SO 4 2- and participate in the formation of ettringite together, and CrO 4 2- tended to precipitate alone to form CrO 4 -ettringite. This paper presents new insights into the solidification and migration behavior of oxyanions when the solidification matrix undergoes phase transformations.
研究领域:
环境科学
·
核废料处理
·
材料科学
✓ 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）