Construction and Building Materials最新文献_第5页

Preparation of high-strength bricks by synergistic densification treatment of phosphogypsum and calcium carbide slag

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-26 DOI: 10.1016/j.conbuildmat.2025.140534

Fenghui Wu , Yu Zhang , Yiting Wang , Dandan Chen , Qiang Niu , Guangfei Qu , Nanqi Ren , Yuanchuan Ren , Xuejun Zhu , Yafang He , Xuan Xiao

{"title":"Preparation of high-strength bricks by synergistic densification treatment of phosphogypsum and calcium carbide slag","authors":"Fenghui Wu , Yu Zhang , Yiting Wang , Dandan Chen , Qiang Niu , Guangfei Qu , Nanqi Ren , Yuanchuan Ren , Xuejun Zhu , Yafang He , Xuan Xiao","doi":"10.1016/j.conbuildmat.2025.140534","DOIUrl":"10.1016/j.conbuildmat.2025.140534","url":null,"abstract":"<div><div>Phosphogypsum(PG) and calcium carbide slag(CCS) are quintessential bulk solid wastes in the chemical and energy industries. Characterized by their substantial production volumes, low resource utilization rates, and significant environmental pollution risks, these waste streams necessitate an expansion in their utilization horizons. To improve the utilization rate of PG and CCS, the densification technology was put forward to produce high-strength densified bricks. After 5 days of natural curing, the densification pressure is 300 MPa, the densified bricks containing 10 % PG and 90 % CCS demonstrated optimal mechanical and waterproof performance. The compressive strength, flexural strength, water absorption and softening coefficient of the densified bricks were approximately 105 MPa, 4 MPa, 3.2 % and 0.99, respectively. SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> and Ca<sup>2 +</sup> in the solid waste contribute to the production of cementitious substances (C-S-H), which contribute to the compressive strength and heavy metals stabilization of the densified bricks. This simple process has the potential to economically and efficiently co-process solid waste and solve its environmental problems. At the same time, it can broaden the channels for solid waste resource utilization, and the high-performance bricks prepared by densification can be used for other special functional purposes, improving their economic value and facilitating their large-scale promotion and application.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"470 ","pages":"Article 140534"},"PeriodicalIF":7.4,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical and in-situ investigation on bilateral double-wall barriers in mitigating metro train-induced vibrations

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-25 DOI: 10.1016/j.conbuildmat.2025.140502

Weili Luo, Shibang Deng

{"title":"Numerical and in-situ investigation on bilateral double-wall barriers in mitigating metro train-induced vibrations","authors":"Weili Luo, Shibang Deng","doi":"10.1016/j.conbuildmat.2025.140502","DOIUrl":"10.1016/j.conbuildmat.2025.140502","url":null,"abstract":"<div><div>In the case of metro tunnels crossing through the area with buildings on both sides in a densely populated mega city, it is necessary to apply a countermeasure to mitigate metro train-induced vibrations on both sides. To achieve this goal, a vibration mitigation measure concept of bilateral double-wall barriers (BDWB) is proposed, in which a wall-soil-wall composite as a double-wall barrier is set in the propagation path from the tunnels to the buildings at one side of the tunnels and, typically, is symmetrically installed at the other side. The performance of the BDWB in a homogeneous halfspace is examined using a 2.5D finite element methodology. The wall-soil-wall composite is idealized as a Timoshenko beam model and its bending dispersion curve is analytically obtained by a simplified method. The physical mechanism of the BDWB is interpreted, indicating the dominance of the bending mode of the wall-soil-wall composite and the influence of a phase shift caused by the compressive wave velocity difference in the BDWB. A series of full-scale in-situ tests are conducted to investigate the isolation performance of the BDWB, followed by a comparison with the corresponding numerical analysis. The results show that a BDWB of 24.5 m depth in the test site can effectively reduce the vibrations behind the BDWB with a maximum average insertion loss of up to 24.3 dB. Results from the in-situ test and the numerical analysis confirm the potential of the BDWB in isolating metro train-induced vibrations.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"469 ","pages":"Article 140502"},"PeriodicalIF":7.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructural characterization and reaction mechanism of home-brewed activator derived from eco-processed pozzolan for one-part geopolymer mortar

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-25 DOI: 10.1016/j.conbuildmat.2025.140513

Gokulanathan Venkatesan , U. Johnson Alengaram , Shaliza Binti Ibrahim , Muhammad Shazril Idris Bin Ibrahim , Sharifah Binti Mohamad

{"title":"Microstructural characterization and reaction mechanism of home-brewed activator derived from eco-processed pozzolan for one-part geopolymer mortar","authors":"Gokulanathan Venkatesan , U. Johnson Alengaram , Shaliza Binti Ibrahim , Muhammad Shazril Idris Bin Ibrahim , Sharifah Binti Mohamad","doi":"10.1016/j.conbuildmat.2025.140513","DOIUrl":"10.1016/j.conbuildmat.2025.140513","url":null,"abstract":"<div><div>Anhydrous sodium-based commercial activators for one-part geopolymer (OGP) may cause eye damage, skin burns due to their corrosive nature, highly hygroscopic nature, high carbon footprint during production, high energy consumption, and cost. This research developed a home-brewed activator (HBA) from industrial/agro-based ash such as Eco-processed pozzolan (EPP) using an alkali fusion method. In the alkali fusion method, a mixture of sodium hydroxide (NaOH) powder and EPP at various weight ratios of 1, and 2 was calcinated in a muffle furnace at 300 °C and 500 °C for 1.5 and 3 h. Ground Granulated Blast Furnace Slag and Fly ash were used as binders for casting the OGP and two-part geopolymer (TGP) mortar specimens. From the X-ray diffraction (XRD) results, the main activator compounds such as thermonatrite (Na<sub>2</sub>CO<sub>3</sub>·H<sub>2</sub>O), natrite (Na<sub>2</sub>CO<sub>3</sub>), calcite (CaCO<sub>3</sub>) and natrosilicate (Na<sub>2</sub>Si<sub>2</sub>O<sub>5</sub>) in HBA that initiate the polymerization reaction. The OGP mortar specimen produced a 28-day compressive strength of 50 MPa under the ambient curing regime with a NaOH/EPP ratio of 1, calcination temperature of 300 °C, and duration of 1.5 h. Both the OGP and TGP mortar specimens showed the presence of calcium aluminosilicate hydrate and calcium sodium aluminosilicate hydrate (C-A-S-H/C-N-A-S-H) geopolymeric gel. The carbon efficiency of OGP mortar specimens was found 70 % lower than that of TGP mortar specimens.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"470 ","pages":"Article 140513"},"PeriodicalIF":7.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Upcycling rice husk biochar into carbon-negative composites

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-25 DOI: 10.1016/j.conbuildmat.2025.140459

Gang Huang , Yan Xia , Yue Liu , Huanyu Li , Yuying Zhang , Liang Chen , Lei Wang , Jianhua Yan

{"title":"Upcycling rice husk biochar into carbon-negative composites","authors":"Gang Huang , Yan Xia , Yue Liu , Huanyu Li , Yuying Zhang , Liang Chen , Lei Wang , Jianhua Yan","doi":"10.1016/j.conbuildmat.2025.140459","DOIUrl":"10.1016/j.conbuildmat.2025.140459","url":null,"abstract":"<div><div>Rice husk biochar (RHB), derived from pyrolyzed agricultural waste rice husk, is rich in carbon and silicon. RHB has a porous structure and possesses a certain degree of pozzolanic reactivity. In this study, RHB pyrolyzed at various temperatures were recycled into cement-based composites. The Frattini test results showed that RHB pyrolyzed at 700 °C exhibited the highest pozzolanic reactivity, resulting in the highest hydration degrees as well as the highest compressive strength of RHB-incorporated cement materials. These enhancements were attributed to the fact that RHB in the cement-based composites performed pozzolanic reactivity, as well as internal curing effect, which was beneficial to the hydration reactions of cement. Nanoindentation and morphologic analyses revealed a substantial accumulation of hydration products in the interfacial transition zone (ITZ), thereby improving micro-mechanical properties. Notably, the incorporation of 30 wt% RHB could produce carbon-negative cement composites with compressive strength over 42.5 MPa. This study elucidated the role of silicon-rich RHB in cement hydration and provided the theoretical foundation for the high-dose use of biochar in sustainable construction materials, advancing carbon-neutrality objectives in the construction sector.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"470 ","pages":"Article 140459"},"PeriodicalIF":7.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Meso-damage mechanism of sintered sludge cementitious composites under uniaxial compression: Experimental characterization and theoretical modeling

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-25 DOI: 10.1016/j.conbuildmat.2025.140490

Jinrui Zhang , Zhuofan Wu , Youzhi Yang , Ziye Kang , Dongshuai Hou , Biqin Dong

{"title":"Meso-damage mechanism of sintered sludge cementitious composites under uniaxial compression: Experimental characterization and theoretical modeling","authors":"Jinrui Zhang , Zhuofan Wu , Youzhi Yang , Ziye Kang , Dongshuai Hou , Biqin Dong","doi":"10.1016/j.conbuildmat.2025.140490","DOIUrl":"10.1016/j.conbuildmat.2025.140490","url":null,"abstract":"<div><div>Considering the performance and environmental potential of sintered sludge cementitious composite (SSCC), this research comprehensively evaluated the meso-damage mechanism of SSCC under uniaxial compression through experimental characterization and theoretical modeling. Specifically, advanced techniques such as acoustic emission (AE), digital image correlation (DIC), low-field nuclear magnetic resonance (LFNMR), and scanning electron microscopy (SEM) were employed to deeply characterize the damage responses, meso-structures and damage morphology. Theoretical modeling based on the classical damage theory (CDT) framework established a stochastic damage constitutive (SDC) model to elucidate the intrinsic relationship between meso-damage mechanism and macro-performance. Results demonstrated that the stress-strain behavior, energy response, and macro-cracks evolution of SSCC, showing distinctly different behaviors before and after the peak point on the constitutive curves, were accurately predicted by SDC model. LFNMR and SEM confirmed that macro-damage originated from interfacial transition zone (ITZ) fracture. Furthermore, SDC model verified that 5 % SSA effectively enhanced the elasticity and ductility of meso-structure, thereby significantly improving the macro-performance and damage resistance.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"469 ","pages":"Article 140490"},"PeriodicalIF":7.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Acoustic emission-based analysis of mechanical behavior and damage evolution in corroded RC square columns

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-25 DOI: 10.1016/j.conbuildmat.2025.140458

Tanbo Pan , Zhengxie Zhang , Yonglai Zheng , Kai Wang

{"title":"Acoustic emission-based analysis of mechanical behavior and damage evolution in corroded RC square columns","authors":"Tanbo Pan , Zhengxie Zhang , Yonglai Zheng , Kai Wang","doi":"10.1016/j.conbuildmat.2025.140458","DOIUrl":"10.1016/j.conbuildmat.2025.140458","url":null,"abstract":"<div><div>This study investigates the impact of corrosion on the mechanical behavior, failure processes, and acoustic emission (AE) characteristics of reinforced concrete (RC) columns under uniaxial compression. The results reveal a transition in failure modes from ductile axial compression in uncorroded specimens to brittle shear-compression failure in severely corroded specimens, driven by weakened reinforcement-concrete bonds and reduced stirrup confinement. Corrosion-induced damage significantly reduces stiffness, ductility, and ultimate load-bearing capacity, compromising structural resilience. AE monitoring highlights a three-stage damage evolution—initial damage, damage propagation, and damage failure—with accelerated microcrack initiation and macrocrack coalescence in corroded specimens. The AE frequency distribution shifts from mid-frequency dominance in uncorroded specimens to low-frequency dominance in heavily corroded specimens, reflecting premature macro-damage and structural instability. Additionally, metrics such as AE cumulative signal strength, historical index (<span><math><mi>HI</mi></math></span>), and severity value (<span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>r</mi></mrow></msub></math></span>) reveal earlier and more concentrated energy release in severely corroded specimens, underscoring the accelerated degradation and brittle failure mechanisms induced by corrosion. Besides, Through Gaussian Mixture Modeling (GMM) analysis of acoustic emission (AE) parameters, a transition from tensile-dominated cracking in uncorroded specimens to shear-dominated failure in severely corroded specimens was observed. These findings demonstrate the utility of AE technology in characterizing corrosion-induced damage and provide critical insights for real-time structural health monitoring and failure prediction.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"469 ","pages":"Article 140458"},"PeriodicalIF":7.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation on physical, rheological properties and VOCs emission of asphalt modified with hydrocarbon-based graphene

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-25 DOI: 10.1016/j.conbuildmat.2025.140474

Yansong Fan , Meizhu Chen , Xiaoyu Yang , Jianwei Zhang , Jun He , Muyan Han

{"title":"Investigation on physical, rheological properties and VOCs emission of asphalt modified with hydrocarbon-based graphene","authors":"Yansong Fan , Meizhu Chen , Xiaoyu Yang , Jianwei Zhang , Jun He , Muyan Han","doi":"10.1016/j.conbuildmat.2025.140474","DOIUrl":"10.1016/j.conbuildmat.2025.140474","url":null,"abstract":"<div><div>Hydrocarbon-based graphene (HG), derived from petrochemical by-products, can be economically produced in large-scale quantities needed for asphalt pavement application requirements. With the intention of exploring the application feasibility of HG in asphalt materials, the properties of HG were elucidated firstly. Basic properties and storage stability of hydrocarbon-based graphene modified asphalt (HGMA) were evaluated while its rheological behaviors and functional group were characterized. In addition, the concentrations of volatile organic compounds (VOCs) in HGMA containing different dosages of HG were assessed. The experimental results indicate that HG possesses a lamellar and pore structure, which is conducive to fusion with asphalt molecules and adsorption capacity. HGMA is harder and expresses weaker sensitivity to temperature than petroleum asphalt. The dispersion of HG in asphalt is uniform when the dosage does not exceed 1.5 % by mass of petroleum asphalt. Incorporation of HG improves the elastic recovery and anti-rutting abilities of asphalt while fatigue resistance is weakened and embrittlement is prone to occurrence. Modification of HG on asphalt belongs to a physical process. The inhibition effect of HG on VOCs emission of asphalt is positively correlates with its dosage, and the maximum concentration and stable concentration of VOCs are reduced by 58 % and 60 % respectively when the dosage of HG reaches 1.5 %. The experimental results provide a foundation for future application and development of HG in asphalt materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"469 ","pages":"Article 140474"},"PeriodicalIF":7.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanically stable and superhydrophobic nano-SiO2@silane/silicate coating for enhanced impermeability of mortar

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-25 DOI: 10.1016/j.conbuildmat.2025.140541

Wei Liu , Jiale Song , Hui Zhao , Zhaokuan Cui , Shuheng Zhang , Yu Qiao , Chenhong Cao , Weiguang Li

{"title":"Mechanically stable and superhydrophobic nano-SiO2@silane/silicate coating for enhanced impermeability of mortar","authors":"Wei Liu , Jiale Song , Hui Zhao , Zhaokuan Cui , Shuheng Zhang , Yu Qiao , Chenhong Cao , Weiguang Li","doi":"10.1016/j.conbuildmat.2025.140541","DOIUrl":"10.1016/j.conbuildmat.2025.140541","url":null,"abstract":"<div><div>The superhydrophobic coating can effectively inhibit the intrusion and adhesion of water-corrosive media on the surface of concrete. However, the poor mechanical stability and expensive materials significantly restricts its application in concrete engineering. Thus, superhydrophobic nano-SiO<sub>2</sub>@silane/silicate coating are successfully prepared by simply spraying nano-SiO<sub>2</sub>@silane on the surface of mortar pretreated by silicate. The pretreated silicate can enable the surface of mortar to enhance flatness and compactness, offering an optimal substrate for spraying nano-SiO<sub>2</sub>@silane hydrolysate. Further, the low surface energy of silane and the micro-nanostructure formed by nano-SiO<sub>2</sub> synergistically make the composite coating possess excellent superhydrophobic properties, with a contact angle of 154° and a slide angle of 5°. Notably, compared with original mortar, the water absorption rate, water vapor transmission rate, and chloride ion penetration depth are reduced by 86.4 %, 67.3 % and 87.9 %, respectively, exhibiting outstanding impermeability. In addition, the coated mortar possesses excellent self-cleaning properties and resistance to rain erosion. Meanwhile, the coated mortar also exhibits excellent resistance to mechanical wear (>200 cycles of abrasions) and resistance to UV radiation (>100 h). Such outstanding comprehensive performance can guarantee concrete to long-term apply in outdoors. This work provides a simple, feasible, economical, and effective research idea for developing superhydrophobic coatings on concrete.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"470 ","pages":"Article 140541"},"PeriodicalIF":7.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical properties and flexural toughness evaluation method of steel fiber reinforced concrete after exposure to elevated temperatures

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-25 DOI: 10.1016/j.conbuildmat.2025.140504

Jun Zhao, Jiashu Wang, Xiaopeng Li, Fuqiang Shen

{"title":"Mechanical properties and flexural toughness evaluation method of steel fiber reinforced concrete after exposure to elevated temperatures","authors":"Jun Zhao, Jiashu Wang, Xiaopeng Li, Fuqiang Shen","doi":"10.1016/j.conbuildmat.2025.140504","DOIUrl":"10.1016/j.conbuildmat.2025.140504","url":null,"abstract":"<div><div>To investigate the mechanical properties of SFRC after exposure to elevated temperatures, tests on 108 cubes and 30 flexural specimens with three steel fiber volume ratios (SFVRs) (i.e. 0 %, 1.0 % and 1.5 %) after elevated temperatures (i.e. 200 ℃, 400 ℃, 600 ℃, 800 ℃ and 1000 ℃) were conducted in this study. The results showed that the enhancement effect of SFVR was most obvious within the temperature range of 600 °C – 800 °C, while it basically disappeared at 1000 °C. Due to the influence of temperature on the formation and decomposition of hydration products, the cubic compressive strength (CCS), peak flexural load (PFL), equivalent flexural strength and initial flexural toughness ratio firstly decreased at 200 °C, and then increased again at 400 °C, and finally decreased rapidly after 600 ℃. The splitting tensile strength (STS) of SFRC initially increased before 200 ℃ and then decreased. After 1000 ℃, the CCS, STS and PFL were merely 26.7 %, 15.9 % and 12.2 % of those at room temperature, respectively. Moreover, the samples which suffered 1000℃ had poor integrity relative to the samples experienced lower temperatures. The empirical models of the CCS and STS with different kinds of fibers after elevated temperatures were proposed. Meanwhile, the expression of STS with respect to CCS was established. Furthermore, a method to evaluate the flexural toughness of SFRC after elevated temperatures was proposed based on equivalent elastic-plastic energy method, which could well reflect the influences of SFVRs and elevated temperatures.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"469 ","pages":"Article 140504"},"PeriodicalIF":7.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transitioning the phase composition of geopolymers: Effect of seed crystal size

IF 7.4 1区工程技术

Construction and Building Materials Pub Date : 2025-02-25 DOI: 10.1016/j.conbuildmat.2025.140487

Bingjie Ren , Chao Li , Jinbang Wang , Dong Li , Zonghui Zhou , Xiuzhi Zhang , Peng Du

{"title":"Transitioning the phase composition of geopolymers: Effect of seed crystal size","authors":"Bingjie Ren , Chao Li , Jinbang Wang , Dong Li , Zonghui Zhou , Xiuzhi Zhang , Peng Du","doi":"10.1016/j.conbuildmat.2025.140487","DOIUrl":"10.1016/j.conbuildmat.2025.140487","url":null,"abstract":"<div><div>Geopolymers hold significant potential for applications in fireproof coatings owing to their excellent high-temperature resistance. However, their main hydration product, a gelatinous phase, undergoes dehydration at ∼500 °C, leading to a decline in performance. Moreover, the zeolite-like phase, a secondary byproduct of the hydration reaction, exhibits superior high-temperature resistance compared with the gelatinous products. Therefore, transitioning the phase composition of geopolymers to increase the zeolite-like phase is beneficial for improving high-temperature resistance. In this study, the seed-induced technique was employed as the transformation technique, and the effects of seed size on the composition and high-temperature resistance of the geopolymer were evaluated. The results showed that zeolite seeds promoted the transition of gelatinous products to zeolite. This effect increased with decreasing seed size. The zeolite content increased from 4.47 % to 11.75 % at a seed particle size of ∼250 nm. Moreover, the seed-induced technique mitigated the detrimental effects of gel dehydration on the microstructure. Newly generated zeolites filled the pores as aggregates after crystalline transformation at high temperatures. Additionally, the compressive strength of geopolymers decreased 20 % when adding the seeds after exposure at 800°C for 1 hour. Overall, this research offers a new approach for enhancing the high-temperature resistance of geopolymer materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"469 ","pages":"Article 140487"},"PeriodicalIF":7.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0