Lin Kae-Long, Lin Deng-Fong
Department of Environmental Engineering, National I-Lan University, Taiwan, Republic of China.
J Air Waste Manag Assoc. 2006 May;56(5):569-74. doi: 10.1080/10473289.2006.10464476.
This study investigates the pozzolanic reactions and compressive strength of the blended cement manufactured using synthetic slag obtained from municipal solid waste incinerator (MSWI) cyclone ash and scrubber ash as partial replacement of portland cement. The synthetic slag was made by co-melting the MSWI scrubber ash and cyclone ash mixtures at 1400 degrees C for 30 min. Following pulverization, the different types of slag were blended with cement as cement replacement at ratios ranging from 10 to 40 wt %. The synthetic slag thus obtained was quantified, and the characteristics of the slag-blended cement pastes were examined. These characteristics included the pozzolanic activity, compressive strength, hydration activity, crystal phases, species, and microstructure at various ages. The 90-day compressive strength developed by slag-blended cement pastes with 10 and 20 wt % of the cement replaced by the synthetic slag outperformed ordinary portland cement by 1-7 MPa. X-ray diffraction species analyses indicated that the hydrates in the slag-blended cement pastes were mainly portlandite, the calcium silicate hydrate gels, and calcium aluminate hydrate salts, similar to those found in ordinary portland cement paste. Differential thermal and thermogravimetric analysis also indicated that the slag reacted with portlandite to form calcium silicate hydrate gels.
本研究调查了使用从城市固体废弃物焚烧炉（MSWI）旋风灰和洗涤器灰中获得的合成矿渣作为部分替代波特兰水泥制成的混合水泥的火山灰反应和抗压强度。合成矿渣是通过将MSWI洗涤器灰和旋风灰混合物在1400摄氏度下共熔30分钟制成的。粉碎后，将不同类型的矿渣与水泥混合，以10至40重量%的比例替代水泥。对由此获得的合成矿渣进行了量化，并研究了矿渣混合水泥浆体的特性。这些特性包括不同龄期的火山灰活性、抗压强度、水化活性、晶相、种类和微观结构。用合成矿渣替代10重量%和20重量%水泥的矿渣混合水泥浆体90天抗压强度比普通波特兰水泥高出1至7兆帕。X射线衍射种类分析表明矿渣混合水泥浆体中的水化物主要是氢氧化钙、硅酸钙水化物凝胶和铝酸钙水化物盐，与普通波特兰水泥浆体中的相似。差示热分析和热重分析也表明矿渣与氢氧化钙反应形成硅酸钙水化物凝胶。
