Abstract

During the expansion process of natural perlite, a large amount of fine fraction of expanded perlite is unavoidably produced. These particles of expanded perlite powder (EPP) have a very low bulk density which caused some difficulty in storage and disposing. This paper investigates the effects of EPP on the properties of high-strength concrete (HSC). For this purpose, different HSC mixtures were designed and produced at two different series made with 0 and 0.5% polypropylene (PP) fibers in which EPP was used at 0-15%. The properties of HSC were investigated for compressive strength, UPV, and initial and final absorption. Variations in the mass and crushing load of HSC specimens were also evaluated after exposure to 5% H₂SO₄ solution. Results show that it is possible to develop HSC with 28-days compressive strength higher than 64.3 MPa by incorporating up to 15% of EPP. In addition, strong UPV-compressive strength correlation had been achieved for non-fibrous HSC mixtures containing EPP. Absorption characteristic of HSC mixtures showed all specimens can classify as “good” concrete quality. Furthermore, 0.5% PP fibers inclusion can minimize the detrimental effects of 5% H₂SO₄ solution attack on the mass loss values of HSC specimens containing 0-15% EPP to some extent.

摘要

在天然珍珠岩的膨胀过程中，不可避免地会产生大量的膨胀珍珠岩细粒。这些膨胀珍珠岩粉末（EPP）颗粒具有非常低的堆积密度，这在储存和处置方面造成了一些困难。本文研究了 EPP 对高强混凝土 (HSC) 性能的影响。为此，设计并生产了两种不同系列的不同 HSC 混合物，由 0 和 0.5% 的聚丙烯 (PP) 纤维制成，其中 EPP 的用量为 0-15%。研究了 HSC 的抗压强度、UPV 以及初始和最终吸收的特性。_{在暴露于 5% H 2} SO ₄后，还评估了 HSC 试样的质量和压碎载荷的变化解决方案。结果表明，通过加入高达 15% 的 EPP，可以开发 28 天抗压强度高于 64.3 MPa 的 HSC。此外，对于含有 EPP 的非纤维 HSC 混合物，已经实现了强的 UPV-抗压强度相关性。HSC 混合物的吸收特性表明所有试样都可以归类为“良好”的混凝土质量。此外，0.5%的PP纤维夹杂物可以在一定程度上减少5% H ₂ SO ₄溶液侵蚀对含0-15% EPP的HSC试样质量损失值的不利影响。