Amran Mugahed, Fediuk Roman, Vatin Nikolai, Lee Yeong Huei, Murali Gunasekaran, Ozbakkaloglu Togay, Klyuev Sergey, Alabduljabber Hisham
Department of Civil Engineering, College of Engineering, Prince Sattam Bin Abdulaziz University, Alkharj 11942, Saudi Arabia.
Department of Civil Engineering, Faculty of Engineering and IT, Amran University, Amran 9677, Yemen.
Materials (Basel). 2020 Sep 28;13(19):4323. doi: 10.3390/ma13194323.
Foamed concrete (FC) is a high-quality building material with densities from 300 to 1850 kg/m, which can have potential use in civil engineering, both as insulation from heat and sound, and for load-bearing structures. However, due to the nature of the cement material and its high porosity, FC is very weak in withstanding tensile loads; therefore, it often cracks in a plastic state, during shrinkage while drying, and also in a solid state. This paper is the first comprehensive review of the use of man-made and natural fibres to produce fibre-reinforced foamed concrete (FRFC). For this purpose, various foaming agents, fibres and other components that can serve as a basis for FRFC are reviewed and discussed in detail. Several factors have been found to affect the mechanical properties of FRFC, namely: fresh and hardened densities, particle size distribution, percentage of pozzolanic material used and volume of chemical foam agent. It was found that the rheological properties of the FRFC mix are influenced by the properties of both fibres and foam; therefore, it is necessary to apply an additional dosage of a foam agent to enhance the adhesion and cohesion between the foam agent and the cementitious filler in comparison with materials without fibres. Various types of fibres allow the reduction of by autogenous shrinkage a factor of 1.2-1.8 and drying shrinkage by a factor of 1.3-1.8. Incorporation of fibres leads to only a slight increase in the compressive strength of foamed concrete; however, it can significantly improve the flexural strength (up to 4 times), tensile strength (up to 3 times) and impact strength (up to 6 times). At the same time, the addition of fibres leads to practically no change in the heat and sound insulation characteristics of foamed concrete and this is basically depended on the type of fibres used such as Nylon and aramid fibres. Thus, FRFC having the presented set of properties has applications in various areas of construction, both in the construction of load-bearing and enclosing structures.
泡沫混凝土（FC）是一种优质建筑材料，密度为300至1850千克/立方米，在土木工程中具有潜在用途，既可用作隔热和隔音材料，也可用于承重结构。然而，由于水泥材料的性质及其高孔隙率，FC在承受拉伸载荷方面非常薄弱；因此，它在塑性状态下、干燥收缩过程中以及固态时经常会开裂。本文是对使用人造纤维和天然纤维生产纤维增强泡沫混凝土（FRFC）的首次全面综述。为此，对各种可作为FRFC基础的发泡剂、纤维和其他成分进行了详细的综述和讨论。已发现有几个因素会影响FRFC的力学性能，即：新拌及硬化后的密度、粒度分布、所用火山灰材料的百分比以及化学发泡剂的体积。研究发现，FRFC混合料的流变性能受纤维和泡沫性能的影响；因此，与无纤维材料相比，有必要额外添加一定剂量的发泡剂，以增强发泡剂与胶凝填料之间的附着力和内聚力。各种类型的纤维可使自收缩降低1.2至1.8倍，干燥收缩降低1.3至1.8倍。纤维的掺入只会使泡沫混凝土的抗压强度略有增加；然而，它可显著提高抗弯强度（高达4倍）、抗拉强度（高达3倍）和冲击强度（高达6倍）。同时，纤维的添加实际上不会改变泡沫混凝土的隔热和隔音特性，这基本上取决于所用纤维的类型，如尼龙和芳纶纤维。因此，具有上述性能的FRFC在建筑的各个领域都有应用，包括承重结构和围护结构的建造。
