Solouki Abbas, Viscomi Giovanni, Tataranni Piergiorgio, Sangiorgi Cesare
Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, 40136 Bologna, Italy.
S.A.P.A.B.A. srl (Società Anonima Prodotti Asfaltico Bituminosi Affini), 40037 Pontecchio Marconi, Italy.
Materials (Basel). 2021 Jan 22;14(3):528. doi: 10.3390/ma14030528.
Every year, up to 3 billion tons of non-renewable natural aggregates are demanded by the construction sector and approximately 623 million tons of waste (mining and quarrying) was produced in 2018. Global efforts have been made to reduce the number of virgin aggregates used for construction and infrastructure sectors. According to the revised waste framework directive in Europe, recycling at least 70% of construction and demolition waste materials by 2020 was obligatory for all member states. Nonetheless, quarries must work at full capacity to keep up with the demands, which has made quarry/mining waste management an important aspect during the past decades. Amongst the various recycling methods, quarry waste can be included in cement mortar mixtures. Thus, the current research focuses on producing cement mortars by partially substituting natural sand with the waste silt obtained from the limestone aggregate production in S.A.P.A.B.A. s.r.l. (Italy). A Design of Experiments (DOE) method is proposed to define the optimum mix design, aiming to include waste silt in cement mortar mixtures without affecting the final performance. Three cement mortar beams were produced and tested for each of the 49 randomized mixtures defined by the DOE method. The obtained results validate the design approach and suggest the possibility of substituting up to 20% of natural sand with waste silt in cement mortar mixtures.
每年，建筑行业对不可再生天然集料的需求量高达30亿吨，2018年产生了约6.23亿吨废弃物（采矿和采石）。全球已在努力减少用于建筑和基础设施领域的原生集料数量。根据欧洲修订后的废弃物框架指令，到2020年所有成员国必须将至少70%的建筑和拆除废料进行回收利用。尽管如此，采石场仍必须满负荷运转以满足需求，这使得采石场/采矿废弃物管理在过去几十年中成为一个重要方面。在各种回收方法中，采石场废弃物可被纳入水泥砂浆混合物中。因此，当前的研究重点是通过用从意大利S.A.P.A.B.A. s.r.l.的石灰石集料生产中获得的废弃淤泥部分替代天然砂来生产水泥砂浆。提出了一种实验设计（DOE）方法来确定最佳配合比设计，旨在将废弃淤泥纳入水泥砂浆混合物中而不影响最终性能。对于由DOE方法定义的49种随机混合物中的每一种，都制作并测试了三根水泥砂浆梁。所得结果验证了该设计方法，并表明在水泥砂浆混合物中用废弃淤泥替代高达20%的天然砂是可行的。
