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首页> 外文期刊>Cement & concrete composites >(103615)Carbonation of Portland-Zeolite and geopolymer well-cement composites under geologic CO_2 sequestration conditions
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(103615)Carbonation of Portland-Zeolite and geopolymer well-cement composites under geologic CO_2 sequestration conditions

机译：（103615）地质CO_2封存条件下波特兰 - 沸石和地质聚合物井水合复合材料的碳化

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Degradation of Portland cement under supercritical CO_2 conditions (SCCO_2) is one of the major concern in geological sequestration projects. This paper presents the research on two novel types of binders considered to display a CO_2 corrosion resistance potential: (1) Portland cement partially replaced with 20, 30 and 40 wt % of zeolite and blended with Styrene-Butadiene (SB) Latex and (2) geopolymer based on lime-slag and lime-pozzolan blends. Specimens were placed in an autoclave, covered with water, heated up to 100 °C and pressurized with 7 MPa CO_2 in order to simulate CO_2 environment in the Croatian wellbore. On behalf of tests on compressive strength, porosity, permeability and alkalinity, as well as thermogravimetry, X-ray diffraction and SEM micro-structural analyses of samples at various penetration depths, carbonation mechanisms were discussed. Portland-Zeolite composites have been argued as potential CO_2 resistant cement systems, with an replacement rate below the minimally tested addition of 20 wt %, as excessive replacement rates resulted in an increase in porosity and permeability. Geopolymer composites based on lime activation unfortunately haven't exhibited required properties for application in well cementing of CO_2 injection wells. Calcium carbonate polymorphs precipitated throughout the whole specimen thickness of all samples, but preferably in mixtures based on Ca-richer raw materials. A re-precipitation of calcium carbonate filled in the porosity preferentially at the 0.5 mm surface layer of PC-based specimens, due to the outward diffusion of calcium at the early stage of carbonation.
机译：超临界CO_2条件下的波特兰水泥的降解是地质封存项目中的主要问题之一。本文介绍了两种新型粘合剂的研究，被认为显示CO_2耐腐蚀电位：（1）波特兰水泥部分替代20,30和40重量％的沸石并与苯乙烯 - 丁二烯（Sb）乳胶和（2 ）基于石灰渣和石灰 - 波佐兰共混物的地质聚合物。将标本置于高压釜中，覆盖用水，加热至100℃并用7MPa CO_2加压，以模拟克罗地亚井筒中的CO_2环境。代表抗压强度的测试，孔隙率，渗透性和碱度以及在各种渗透深度下的样品的X射线衍射和SEM微结构分析，讨论了碳化机制。已经认为波特兰 - 沸石复合材料是潜在的CO_2抗性水泥系统，其替代率低于最小测试的20wt％，因为过度的替代率导致孔隙率和渗透率增加。遗憾的是，基于石灰激活的地质聚合物复合材料尚未表现出在CO_2注射孔的井固井中的应用所需的性能。碳酸钙多晶型物在所有样品的整个样本厚度沉淀出沉淀，但优选在基于Ca-rolber原料的混合物中。优先于PC基样本的0.5mm表面层的孔隙率填充在孔隙率的碳酸钙的重新沉淀，由于钙的早期碳酸化的外侧扩散。

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