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The Effect of Wet-grinding on the Properties of Glass Powder and Its Application in Cement Based materials

Journal of Wuhan University of Technology(materials Science) 2023年第6期38卷 1372-1381页

作者： WANG Yingbin YANG Jie SU Ying HE Xingyang STRNADEL Bohumir School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan 430068China Center for Advanced and Innovative Technologies VSB-Technical University of OstravaOstrava-Poruba 70833Czech Republic

To improve the pozzolanic reactivity,waste glass(WG)needs to be micronized to fine particles so as to expedite the leaching of active *** key feature of this work is to examine the effect of wet-grinded WG on the mechanical and structural properties of cement based *** experimental results show that wet-grinding can improve the ions leaching behavior of WGP and decrease the stability of silicon oxide *** pozzolanic reactivity of WGP was dramatically enhanced after wet-grinding,as high as 144.1%at 1 d and 110.9%at 28 d when the mean grain size of WGP reached 0.90μ*** ground WGP can promote the transformation of capillary pores to gel pores to improve the compactness of microstructure regardless of the reaction time.

关键词： supplementary cementitious materials pozzolanic reactivity wet-grinding compressive strength

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The NMR core analyzing tomograph:a multi-functional tool for non-destructive testing of building materials

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Magnetic Resonance Letters 2023年第3期3卷 207-219,I0003页

作者： Sabine Kruschwitz Sarah Munsch Melissa Telong Wolfram Schmidt Thilo Bintz Matthias Fladt Ludwig Stelzner Bundesanstalt für Materialforschung und-prüfung Unter den Eichen 87Berlin12205Germany Technische Universitat Berlin Gustav-Meyer-Allee 25Berlin13355Germany

NMR is becoming increasingly popular for the investigation of building materials as it is a non-invasive technology that does not require any sample preparation nor causes damage to the *** on the specific application it can offer insights into properties like porosity and spatial saturation degree as well as pore *** it enables the determination of moisture transport properties and the(re-)distribution of internal moisture into different reservoirs or chemical phases upon damage and ***,as yet most investigations were carried out using devices originally either designed for geophysical applications or the analysis of rather homogeneous small scale(<10 mL)*** paper describes the capabilities of an NMR tomograph,which has been specifically optimized for the investigation of larger,heterogeneous building material samples(diameters of up to 72 mm,length of up to 700 mm)with a high flexibility due to interchangeable coils allowing for a high SNR and short echo times(50-80 ms).

关键词： Natural stone Concrete Sensitivity Moisture transport Cement hydration supplementary cementitious materials Frost and salt attack Fire spalling

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Biochar as construction materials for achieving carbon neutrality

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Biochar 2022年第1期4卷 194-218页

作者： Yuying Zhang Mingjing He Lei Wang Jianhua Yan Bin Ma Xiaohong Zhu Yong Sik Ok Viktor Mechtcherine Daniel C.W.Tsang Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China Laboratory for Waste Management Nuclear Energy and SafetyPaul Scherrer Institute5232 VilligenSwitzerland School of Civil Engineering University of LeedsWest YorkshireLeedsUK Korea Biochar Research Center APRU Sustainable Waste Management Program&Division of Environmental Science and Ecological EngineeringKorea UniversitySeoulKorea Institute of Construction materials Technische Universität Dresden01062 DresdenGermany Research Centre for Resources Engineering towards Carbon Neutrality The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Biochar is a waste-derived material that can sequester carbon at a large *** development of low-carbon and sustainable biochar-enhanced construction materials has attracted extensive ***,having a porous nature and highly functionalised surface,can provide nucleation sites for chemical reactions and exhibit compatibility with cement,asphalt,and polymer *** study critically reviewed the state-of-the-art biochar-enhanced construction materials,including biochar-cement composites,biochar-asphalt composites,biochar-plastic composites,*** efficacies and mechanisms of biochar as construction materials were articulated to improve their functional *** critical review highlighted the roles of biochar in cement hydration,surface functional groups of engineered biochar for promoting chemical reactions,and value-added merits of biochar-enhanced construction materials(such as humidity regulation,thermal insulation,noise reduction,air/water purification,electromagnetic shielding,and self-sensing).The major properties of biochar are correlated to the features and functionalities of biochar-enhanced construction *** advances in our understanding of biochar’s roles in various composites can foster the next-generation design of carbon-neutral construction materials.

关键词： Engineered biochar Biomass waste management Carbon-negative materials Carbon neutrality supplementary cementitious materials Sustainable construction

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THE ROAD TO PLATINUM Using the USGBC’s LEED-EB® Green Building Rating System to Retrofit the U.S. Environmental Protection Agency’s Region 10 Park Place Office Building

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Journal of Green Building 2010年第2期5卷 55-75页

作者： Jeffrey M.Keeton University of Washington

According to the *** Building Council(USGBC),buildings account for a significant amount of environmental *** building sector is the number one producer of global CO_(2) emissions in the U.S.,followed by the transportation and industrial sectors.1(See Figure 1 for the environmental impact of all ***.)The concept of green buildings represents a major paradigm shift in the architectural,construction,and engineering *** society increasingly switches its appreciation of buildings from merely size and aesthetics toward environmental stewardship and efficiency,the USGBC’s LEED Green Building Rating System has become increasingly popular to *** its inception in 2000,the LEED system has been promoting and monitoring green building practices throughout the United *** a four-tiered rating scheme including LEED Certified,LEED Silver,LEED Gold,and LEED Platinum,the system currently has 35,000 projects already on their way toward certification.2 In particular,the LEED for Existing Buildings(LEED-EB)system looks to retrofit existing buildings into those that are more sustainable,efficient,and environmentally *** so significantly reduces the demand for new resources,as construction managers can recycle and reuse building materials and incorporate them into new *** truly is the definition of green building and is the way of the *** implementing green building practices,many of the adverse environmental impacts of buildings can be dramatically reduced,often for only a one to two percent initial cost premium over the price of conventional construction practice.3 Several environmental benefits of green buildings include improving air and water quality,conserving natural resources,and becoming more energy *** have shown that green buildings,compared to normal buildings,can reduce energy use by 24–50 percent,CO_(2) emissions by 33–39 percent,water use by 40 percent,and solid waste by 70 percent.4(Se

关键词： LEED-EB EPA Environmentally Preferable Purchasing green building embodied energy concrete supplementary cementitious materials

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Cracking behaviors and crack control of self-consolidating concrete: a review of literature

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Journal of Chongqing University 2012年第3期11卷 112-118页

作者：陈瑜 School of Traffic and Transportation Engineering Changsha University of Science & Technology

Cracking in concrete occurs from volumetric instability, mechanical loading, and/or environmental attack. Compared to conventional vibrated concrete, self-consolidating concrete often has a higher susceptibility to crack due to different mixture design, material properties and construction practices. To obtain a better understanding of self-consolidating concrete cracking behaviors for designing and constructing crack-controlled structural elements, reported current research and practices are reviewed and analyzed in this paper. It has been believed that when well designed and welt constructed, high quality self- consolidating concrete can be successfully used in various structures with cracks properly controlled.

关键词： self-consolidating concrete shrinkage cracking supplementary cementitious materials mechanical properties mix proportioning

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Hydration Properties of Calcined Clay Pozzolan and Limestone Mineral Admixtures in Binary and Ternary Cements

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Journal of Physical Science and Application 2014年第5期4卷 323-327页

作者： Eugene Atiemo Charles Kwame Kankam Francis Momade Kwabena Appiah Boakye CSIR-Building and Road Research Institute UST Box 40 Kumasi Ghana Kwame Nkrumah University of Science and Technology College of Engineering Kumasi Ghana

This paper investigates the properties of hydrated binary and ternary blended cements using limestone and calcined clay pozzolan as supplementary cementitious materials. The blended cements were hydrated and their phase compositions were evaluated by thermogravimetric and powder X-ray diffraction at 28 days. The morphology of the samples was also determined. The water demand, setting time, compressive and flexural strengths of mortar and concrete samples were determined up to 365 days. The study concluded that the portlandite [Ca（OH）2] content was considerably reduced whilst ettfingite formation were enhanced as a result of admixture reactions. The water demand and setting times of blended cements were lower than OPC with 5% admixture content but higher with increasing content. The mechanical test results also showed that Class 42.5N and 32.5R cements can be produced from the binary and ternary blends containing up to 10% and 20% admixtures, respectively.

关键词： limestone calcined clay pozzolan supplementary cementitious materials admixtures portlandite ettringite strength.

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