废纸污泥灰作为矿粉在热沥青混凝土配合料中的应用

Volodymyr Hidei, Iurii Sidun, Oleksii Hunyak, S. Stanchak, Volodymyr Bidos
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引用次数: 2

摘要

本文论证了废纸污泥灰作为矿粉在传统热沥青混凝土中应用的潜力。本文采用传统的石灰石矿粉进行对比试验。研究了聚集体的化学(氧化物)组成,并用DRON - 3.0衍射仪对其进行了测定。研究结果表明,废纸污泥灰分中含有足够数量的CaO,可作为沥青混凝土的骨料。测定了石灰石矿物粉的粒度组成,并用球磨机对废纸污泥灰分进行研磨,直至得到合适的粒度组成。研究了70/100沥青与所研究的矿物骨料结合形成沥青粘结剂的主要物理力学参数。形成了石灰石矿粉、废纸污泥灰分、石灰石矿粉与废纸污泥灰分按50/50、30/70、20/80 (% w/w)比例混合的传统热沥青混凝土系列。利用密级配连续混合料的级配曲线,设计了沥青混凝土混合料的碎粒体。根据以下特点设计沥青混凝土配合比:热细粒致密沥青混凝土,残余孔隙率为2% ~ 5%,碎块颗粒数量大于5mm - 35 ~ 45%,最大粒径可达15mm。研究结果表明,WSA可作为矿粉用于沥青混凝土混合料。根据乌克兰标准(DSTU B V.2.7-119:2011)的要求,添加WSA的沥青混凝土是标准状态,但含水饱和度指数接近可接受允许值,而与添加LMP的沥青混凝土相比,它高出55%。这种结果是由于团聚体的氧化物组成不同,即WSA中钙质岩石的产物含量较低。石灰石矿粉与水白粉按50/50、30/70、20/80 (% w/w)比例联合施用时,水饱和指数降低。含水饱和后的抗压强度和抗压强度,WSA仅比LMP低10%。考虑到所做的研究,WSA的最有效利用可以以50/50的比例与LMP结合使用。
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Application of wastepaper sludge ash as mineral powder for hot asphalt concrete mix
In this article the potentiality is proven for application of wastepaper sludge ash (WSA) as mineral powder for traditional hot asphalt concrete mix. For the comparative testing in this article the traditional limestone mineral powder is used. The chemical (oxide) composition of the aggregates was studied, while that was determined by means of DRON - 3.0 diffractometer. It was ascertained that CaO is present in wastepaper sludge ash in sufficient quantity, while it provides for utilization of this waste material as an aggregate for asphalt concrete. The limestone mineral powder granulometric composition was determined and the wastepaper sludge ash was grinded by ball grinder till the appropriate granulometric composition was reached. There were studied the main physical and mechanical parameters of bitumen 70/100 to be used for formation of asphalt binder in combination with the studied mineral aggregate. There were formed the following series of traditional hot asphalt concrete mix: on limestone mineral powder, on wastepaper sludge ash, on both limestone mineral powder and wastepaper sludge ash in ratio 50/50, 30/70, 20/80 (% w/w). By means of grading curves of dense-graded continuous mixes there was designed the chip-grain carcass of asphalt concrete mix. The asphalt concrete mix was designed based on the following characteristics: hot fine-grained densegraded asphalt concrete with residual porosity from 2 % to 5 %, with quantity of chip-grains sized more than 5 mm – 35-45 % and the maximum grain-size up to 15 mm. There was determined that WSA can perform as material to be used as mineral powder for asphalt concrete mixes. According to the requirements of Ukrainian standard (DSTU B V.2.7-119:2011), the asphalt concrete with WSA is of standard condition, but the water-saturation index approaches the acceptably allowed value, while in comparison with asphalt concrete with LMP – it is higher by 55%. Such result is due to the difference in oxide composition of the aggregates, namely lower content of products of calcareous rock in WSA. With combined application of limestone mineral powder and WSA in ratio 50/50, 30/70, 20/80 (% w/w) the water-saturation index decreases. As to the compression tensile strength and compression tensile strength after water-saturation, these indices on WSA are lower than on LMP just by 10%. The most efficient usage of WSA, considering the studies done, can be achieved when coupled with LMP in ratio 50/50.
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