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Improvement of physico-mechanical and microstructural properties of magnesium phosphate cement composites comprising with Phosphogypsum
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2020-03-26 , DOI: 10.1016/j.jclepro.2020.121268
M. Aminul Haque , Bing Chen , Yuantao Liu , Syed Farasat Ali Shah , Muhammad Riaz Ahmad

The current study aimed to utilize the Phosphogypsum (PG) as a mixing ingredient in the magnesium phosphate cement (MPC) matrix and the influence of PG on the physical, mechanical and microstructural properties were explored over the courses of age. For judging the well interactions between the PG and MPC, consecutive dosages such 10%–40%, 60% and 80% PG were introduced as the substitution of very fine aggregate. The analytical results revealed the progress of density and decline of inner void spaces of the solid specimens with the higher amounts of PG. Mechanical strength pointedly enriched for the inclusion of PG up to 40% and obtained the compressive strength and flexural strength more than 75 MPa and 12 MPa, respectively at 28d in air, which were above 90% of control samples. The mass losses were noticed around 2% at 28d curing age. Microstructural properties analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD) demonstrated the well formation of calcium silicate hydrate (CSH), ettringite and some intermediate minerals along with the main struvite crystal, which developed the structural integrity of matrices. The Fourier Transform Infrared spectroscopy (FTIR) analysis also confirmed the existence of new chemical groups in MPC with PG content that indicated the presence of CSH and ettringite. The outcomes of the current research can be a promising solution to reuse PG as an ingredient in the MPC compounds as well as reduce the environmental concern.



中文翻译:

含磷石膏的磷酸镁水泥复合材料的物理力学和微观结构性能的改善

当前的研究旨在利用磷石膏(PG)作为磷酸镁水泥(MPC)基质中的混合成分,并且随着年龄的增长,探索了PG对物理,机械和微观结构性质的影响。为了判断PG和MPC之间的良好相互作用,引入了连续剂量(如10%–40%,60%和80%PG)来替代非常细的骨料。分析结果表明,随着PG含量的增加,固体样品的密度和内部空隙空间的下降。PG的机械强度明显提高至40%,并且在空气中28d时分别获得了大于75 MPa和12 MPa的抗压强度和抗弯强度,高于对照样品的90%。在固化28d时发现质量损失约为2%。通过扫描电子显微镜(SEM)和X射线衍射(XRD)分析的微观结构性质表明,水合硅酸钙(CSH),钙矾石和一些中间矿物与主要鸟粪石晶体形成良好,从而形成了基质的结构完整性。傅立叶变换红外光谱(FTIR)分析还证实了MPC中含有PG含量的新化学基团,表明存在CSH和钙矾石。当前研究的结果可能是将PG用作MPC化合物中的一种成分并减少对环境的关注的有前途的解决方案。钙矾石和一些中间矿物以及主要鸟粪石晶体,形成了基质的结构完整性。傅立叶变换红外光谱(FTIR)分析还证实了MPC中含有PG含量的新化学基团,表明存在CSH和钙矾石。当前研究的结果可能是将PG用作MPC化合物中的一种成分并减少对环境的关注的有前途的解决方案。钙矾石和一些中间矿物以及主要鸟粪石晶体,形成了基质的结构完整性。傅立叶变换红外光谱(FTIR)分析也证实了MPC中具有PG含量的新化学基团的存在,表明存在CSH和钙矾石。当前研究的结果可能是一种有前途的解决方案,可以将PG作为MPC化合物中的一种成分再利用,并减少对环境的关注。

更新日期:2020-03-27
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