The use of porous particles as aggregates in cementitious mixes presents advantages such as reducing dead load and assisting in thermal insulation of constructions. Pumice aggregates are most commonly used because they are cheap, natural and easily obtainable. However, there are also disadvantages such as brittle behavior and decrease in strength. In this study, 0, 1 and 2 vol% polypropylene fibers (PF) having 40 micrometer diameter were used in the production of mortars containing acidic (AP) and basaltic pumices (BP) in place of calcareous sand (CS), in order to overcome these challenges. In addition to mechanical properties (compressive, flexural and splitting tensile strength), physical properties (bulk density and capillarity) and morphology of mortars (scanning electron and optical microscopy) were also investigated. The results showed that bulk density of BP mortars was about 10% lower and that of AP mortars was about 15% lower than that of CS mortars. Flexural strength of BP and CS mortars were over 7 MPa, whereas that of AP mortars were in 4–6 MPa range. Addition of 1% PF improved the mechanical properties, whereas addition of 2% PF resulted in a decrease in strength in all mortar types. The highest 1-year compressive strength was obtained by the BP sample having 1% PP fiber. Furthermore, there was a strong relationship between the strength and bulk density of mortars.

在水泥混合料中使用多孔颗粒作为聚集体具有许多优点，例如减少静载并有助于建筑物的隔热。浮石聚集体是最常用的，因为它们便宜，天然且容易获得。但是，也存在诸如脆性和强度降低的缺点。在这项研究中，直径为40微米的0、1、2体积％聚丙烯纤维（PF）用于生产含酸性（AP）和玄武质浮石（BP）的砂浆，以代替钙质砂（CS）。克服这些挑战。除了机械性能（抗压强度，弯曲强度和劈裂强度）外，还研究了砂浆的物理性能（堆积密度和毛细作用）和形态（扫描电子显微镜和光学显微镜）。结果表明，与CS砂浆相比，BP砂浆的堆积密度降低了约10％，AP砂浆的堆积密度降低了约15％。BP和CS砂浆的抗弯强度超过7 MPa，而AP砂浆的抗弯强度在4-6 MPa范围内。添加1％PF改善了机械性能，而添加2％PF导致所有砂浆类型的强度降低。具有1％PP纤维的BP样品获得了最高的1年抗压强度。此外，砂浆的强度和堆积密度之间存在很强的关系。而添加2％PF会导致所有砂浆类型的强度降低。具有1％PP纤维的BP样品获得了最高的1年抗压强度。此外，砂浆的强度和堆积密度之间存在很强的关系。而添加2％PF会导致所有砂浆类型的强度降低。具有1％PP纤维的BP样品获得了最高的1年抗压强度。此外，砂浆的强度和堆积密度之间存在很强的关系。