Chemistry of cement hydration in polymer-modified pastes containing lead compounds |
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| Affiliation: | 1. Department of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milano, Italy;2. Department of Chemistry, Materials and Chemical Engineering “G. Natta”, Politecnico di Milano, P.zza L. da Vinci 32, 20133 Milano, Italy;1. Department of Materials Science and Engineering, Korea University, Anam-dong, Sungbuk-ku, Seoul 136-713, Republic of Korea;2. Energy Storage Group, Energy Lab, SAIT, Samsung Electronics Co., Ltd., Yongin-Si, Gyeonggi-Do 446-712, Republic of Korea;1. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150080, China;2. School of Mechanical & Aerospace Engineering, Nanyang Technological University, 639798, Singapore;3. Evonik Hanse GmbH, Geesthacht 21502, Germany;4. Department of Mechanical & Aerospace Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;1. Institutes of High Temperature Structural Composite Materials for Naval Ship, Naval University of Engineering, No. 717 Jiefang Street, Wuhan, Hubei Province 430033, China;2. School of Power Engineering, Naval University of Engineering, China;1. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan;2. Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan |
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| Abstract: | The role of polymeric additives on the hydration process of cement pastes admixed with a lead compound (Pb3O4) was investigated. Three series of pastes were prepared: the reference series, mixing water with Ordinary Portland Cement (OPC), and two series in which whether a styrene–butadiene rubber latex or a superplasticiser based on acrylic-modified polymer was added to the pastes. For each series, 5 and 10 wt% of Pb were mixed with the pastes. Phase analysis and microstructural characterisation were carried out by means of X-ray powder diffraction and SEM–EDX. Thermogravimetric analysis was performed to monitor the hydration degree of the three pastes; indeed, quantitative determination of portlandite and calcite was performed.Dynamic leach tests were performed on solidified monoliths to evaluate the effective immobilisation of Pb3O4. After 384 h leaching, excellent results were obtained by pastes mixed with superplasticiser that showed a cumulative release of Pb equal to 0.62 mg/l for samples containing 5 wt% of Pb, and equal to 0.84 mg/l for samples bearing 10 wt% of Pb. |
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