Muradyan Nelli G, Arzumanyan Avetik A, Kalantaryan Marine A, Vardanyan Yeghiazar V, Yeranosyan Mkrtich, Ulewicz Malgorzata, Laroze David, Barseghyan Manuk G
Faculty of Construction, National University of Architecture and Construction of Armenia, 105 Teryan Street, Yerevan 0009, Armenia.
Innovation Center for Nanoscience and Technologies, A.B. Nalbandyan Institute of Chemical Physics NAS RA, 5/2 P. Sevak Street, Yerevan 0014, Armenia.
Materials (Basel). 2023 Aug 8;16(16):5516. doi: 10.3390/ma16165516.
In this work, the effect of biosilica concentration and two different mixing methods with Portland cement on the compressive strength of cement-based mortars were investigated. The following values of the biosilica concentration of cement weight were investigated։ 2.5, 5, 7.5, and 10 wt.%. The mortar was prepared using the following two biosilica mixing methods: First, biosilica was mixed with cement and appropriate samples were prepared. For the other mixing method, samples were prepared by dissolving biosilica in water using a magnetic stirrer. Compressive tests were carried out on an automatic compression machine with a loading rate of 2.4 kN/s at the age of 7 and 28 days. It is shown that, for all cases, the compressive strength has the maximum value of 10% biosilica concentration. In particular, in the case of the first mixing method, the compressive strength of the specimen over 7 days of curing increased by 30.5%, and by 36.5% for a curing period of 28 days. In the case of the second mixing method, the compressive strength of the specimen over 7 days of curing increased by 23.4%, and by 47.3% for a curing period of 28 days. Additionally, using the first and second mixing methods, the water absorption parameters were reduced by 22% and 34%, respectively. Finally, it is worth noting that the obtained results were intend to provide valuable insights into optimizing biosilica incorporation in cement mortar. With the aim of contributing to the advancement of construction materials, this research delves into the intriguing application of biosilica in cement mortar, emphasizing the significant impact of mixing techniques on the resultant compressive strength.
在本研究中，研究了生物二氧化硅浓度以及与波特兰水泥的两种不同混合方法对水泥基砂浆抗压强度的影响。研究了水泥重量中生物二氧化硅浓度的以下值：2.5、5、7.5和10 wt.%。使用以下两种生物二氧化硅混合方法制备砂浆：第一种，将生物二氧化硅与水泥混合并制备适当的样品。对于另一种混合方法，通过使用磁力搅拌器将生物二氧化硅溶解在水中来制备样品。在自动压力试验机上以2.4 kN/s的加载速率在7天和28天龄期进行抗压试验。结果表明，在所有情况下，抗压强度在生物二氧化硅浓度为10%时达到最大值。特别是，在第一种混合方法的情况下，养护7天的试件抗压强度提高了30.5%，养护28天的试件抗压强度提高了36.5%。在第二种混合方法的情况下，养护7天的试件抗压强度提高了23.4%，养护28天的试件抗压强度提高了47.3%。此外，使用第一种和第二种混合方法，吸水率参数分别降低了22%和34%。最后，值得注意的是，所获得的结果旨在为优化水泥砂浆中生物二氧化硅的掺入提供有价值的见解。为了推动建筑材料的发展，本研究深入探讨了生物二氧化硅在水泥砂浆中的有趣应用，强调了混合技术对所得抗压强度的重大影响。
