Nalobile Protus, Wachira Jackson Muthengia, Thiong'o Joseph Karanja, Marangu Joseph Mwiti
Department of Chemistry, Kenyatta University, Nairobi, Kenya.
Department of Physical Sciences, University of Embu, Embu, Kenya.
Heliyon. 2019 Sep 9;5(9):e02443. doi: 10.1016/j.heliyon.2019.e02443. eCollection 2019 Sep.
This paper presents the findings of an experimental investigation on optimizing pozzolanic activity of a blend of Rice Husks (RH), Spent Bleaching Earth (SBE) and Broken Bricks (BB) to form pozzolana that would have pozzolanic activity comparable to natural pozzolanas. Four ratios of RH, BB, and SBE were burnt in the Fixed Bed Kiln (FBK). The starting ratio had 20 kg of RH, 0 kg of BB and 4 kg of SBE. The amount of BB was increased by 2 kg each to a maximum of 6 kg as the mass of SBE was kept constant. The resultant ashes were subjected to various pozzolanic tests. This included; saturated lime test and compressive strength analysis. It was observed that the calcined blend with 10: 1: 2 mix of RH: BB: SBE exhibited the highest pozzolanic activity. This sample was mixed with acetylene lime sludge (ALS) in the ratio of 2:1 pozzolana: ALS. The compressive strengths for these cements were tested at 2 and 28 days of curing. The compressive strengths of this cement met the required EN standards for Portland pozzolana cement.
本文介绍了一项实验研究的结果，该研究旨在优化稻壳（RH）、废漂白土（SBE）和碎砖（BB）混合物的火山灰活性，以形成具有与天然火山灰相当的火山灰活性的火山灰。在固定床窑（FBK）中燃烧了四种RH、BB和SBE的比例。起始比例为20千克RH、0千克BB和4千克SBE。随着SBE的质量保持不变，BB的量每次增加2千克，最大增加到6千克。对所得灰烬进行了各种火山灰测试。这包括：饱和石灰测试和抗压强度分析。观察到，RH:BB:SBE为10:1:2混合的煅烧混合物表现出最高的火山灰活性。该样品与乙炔石灰污泥（ALS）按火山灰:ALS为2:1的比例混合。在养护2天和28天时测试了这些水泥的抗压强度。这种水泥的抗压强度符合波特兰火山灰水泥所需的EN标准。
