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首页> 美国卫生研究院文献>Materials >Improvements in Aggregate-Paste Interface by the Hydration of Steelmaking Waste in Concretes and Mortars
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Improvements in Aggregate-Paste Interface by the Hydration of Steelmaking Waste in Concretes and Mortars

机译：通过水合混凝土和砂浆中的炼钢废物来改善骨料-浆体界面

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The objective of the experimental work is to study the mechanical properties in self-compacting concretes (SCC) in which part of the limestone aggregate has been replaced by granulated blast furnace slag (GBFS) in different percentages ranging from 0% to 60%. The results show that at early ages the SCC with the largest content in slag tend to have lower compressive strengths due to the poor compacting of the aggregates, although in the long-term their strength increases due to the reactivity of the slag. In fact, at the age of 365 days, the mortars made with the substitution of 50% of cement by ground GBFS reach compressive strength similar to that of the mortar made with 100% of cement. The consumption of calcium hydroxide during the hydration of the GBFS and the formation of hydrated calcium silicate (CSH) improve the mechanical properties of the slag-paste interface. The new compounds formed by the hydration of anhydrous oxides of the GBFS improve the aggregate-paste transition zone. The chemical interaction between the dissolution of the cement pore and the GBFS ends up generating new compounds on its surface. The increasing hydration of the GBFS produces a greater amount of silica gel that polymerises, densifying the matrix and reducing the porosity, which improves the mechanical properties of the concrete and perhaps its durability. The topography of the particles and their interface are analysed with atomic force microscopy techniques to assess the morphology depending on the aggregate used. On the other hand, a study was carried out of the aggregate-paste interface with scanning electronic microscope at different ages. It can be seen that in the contours of the hydrated GBFS particles, a band or ring forms with the new reaction products. The results obtained strengthen the previous conclusions. The new hydrated compounds fill the reaction ring, introducing chemical bonds between the aggregate and the interface, occupying part of the original pores or substituting spaces occupied originally by large portlandite crystals, of lesser mechanical strength and easily leached. For all this, the benefit is twofold. On the one hand, use is made of industrial by-products and, on the other hand, part of the destruction of natural quarries to obtain the necessary raw materials is avoided.
机译：实验工作的目的是研究自密实混凝土（SCC）的机械性能，其中部分石灰石骨料已被颗粒状高炉矿渣（GBFS）替代，比例从0％到60％不等。结果表明，由于骨料的致密性差，在矿渣中含量最高的SCC往往具有较低的抗压强度，尽管从长远来看，由于矿渣的反应性，其强度会提高。实际上，在365天的使用期限内，用地面GBFS代替50％水泥制成的砂浆的抗压强度与使用100％水泥制成的砂浆的抗压强度相似。 GBFS水合过程中氢氧化钙的消耗和水合硅酸钙（CSH）的形成改善了矿渣与浆体界面的机械性能。由GBFS的无水氧化物水合形成的新化合物改善了骨料-糊料过渡区。水泥孔隙的溶解与GBFS之间的化学相互作用最终在其表面上生成新的化合物。 GBFS不断增加的水合作用会产生大量硅胶，这些硅胶会聚合，从而使基质致密并降低孔隙率，从而改善混凝土的机械性能，并可能改善其耐久性。使用原子力显微镜技术分析颗粒的形貌及其界面，以根据所使用的聚集体评估形态。另一方面，用扫描电子显微镜对不同年龄的骨料-糊剂界面进行了研究。可以看出，在水合GBFS颗粒的轮廓中，新的反应产物形成了带或环。获得的结果加强了先前的结论。新的水合化合物充满了反应环，在聚集体和界面之间引入了化学键，占据了原来的孔的一部分，或者取代了原来的大硅酸盐晶体所占据的空间，机械强度较低，并且易于浸出。对于所有这些，好处是双重的。一方面，利用了工业副产品，另一方面，避免了部分破坏天然采石场以获得必要的原材料。

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