Othuman Mydin Md Azree, Mohd Nawi Mohd Nasrun, Mohamed Othman, Sari Marti Widya
School of Housing, Building and Planning, Universiti Sains Malaysia, Gelugor 11800, Penang, Malaysia.
Disaster Management Institute (DMI), School of Technology Management and Logistics, Universiti Utara Malaysia, Sintok 06010, Kedah, Malaysia.
Materials (Basel). 2022 Aug 26;15(17):5911. doi: 10.3390/ma15175911.
The advancement in sustainable construction has stimulated wide-ranging investigation of construction materials and practices globally. With exceptional thermal properties, fire resistance performance, excellent strength, and outstanding durability, concrete is the utmost extensively utilized construction material around the world. Taking into consideration the quantity of concrete necessary for numerous constructions works, improving concrete sustainability would be an extremely attractive potential. Lightweight foamed concrete (LFC) is tremendously permeable, and its mechanical properties weaken with a growth in the volume of voids. Air-void segregation from solid cement phases by means of aging, drainage, and merging of voids can trigger and reduce the stability and consistency of the emitted pores, making the LFC less reliable for main utilization in load-bearing components and structural elements. In turn, to augment LFC mechanical properties, the LFC cementitious matrix can be adjusted by adding various nanoparticles. The influence of magnetite nanoparticles (MNP) in LFC was not examined in the past; hence, there is some vagueness considering the mechanism to which level the MNP can affect the LFC mechanical properties. Thus, the aim of this study is to investigate the influences of MNP on the compressive, splitting tensile, and flexural LFC of 1000 kg/m density. Six MNP weight fractions of 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, and 0.35% were considered. The parameters accessed were compressive, splitting tensile and flexural strengths. The correlation between strength parameters was established as well. The results indicated that a 0.25% weight fraction of MNP gave the best performance in terms of compressive, flexural, and splitting tensile strengths. The presence of MNP in the LFC matrix enhances the viscosity and yield stress of the mixture as well as an augmented utilization of LFC cementitious binder content, which can sustain the integrity of the wet networks hence preventing further amalgamation and aging of the voids.
可持续建筑的发展推动了全球范围内对建筑材料和实践的广泛研究。混凝土具有卓越的热性能、耐火性能、优异的强度和出色的耐久性，是全球使用最为广泛的建筑材料。考虑到众多建筑工程所需的混凝土数量，提高混凝土的可持续性将是一个极具吸引力的潜力方向。轻质泡沫混凝土（LFC）具有极高的渗透性，其力学性能会随着孔隙体积的增加而减弱。通过孔隙的老化、排水和合并，气孔与固体水泥相分离会引发并降低所产生孔隙的稳定性和一致性，使得LFC在承重部件和结构元件中的主要应用可靠性降低。反过来，为了提高LFC的力学性能，可以通过添加各种纳米颗粒来调整LFC胶凝基体。过去尚未研究磁铁矿纳米颗粒（MNP）对LFC的影响；因此，对于MNP能够在何种程度上影响LFC力学性能的机制存在一些模糊之处。因此，本研究的目的是研究MNP对密度为1000 kg/m³的LFC的抗压、劈裂抗拉和抗弯性能的影响。考虑了六种MNP重量分数，分别为0.10%、0.15%、0.20%、0.25%、0.30%和0.35%。所测定的参数为抗压、劈裂抗拉和抗弯强度。还建立了强度参数之间的相关性。结果表明，0.25%重量分数的MNP在抗压、抗弯和劈裂抗拉强度方面表现最佳。LFC基体中MNP的存在提高了混合物的粘度和屈服应力，以及LFC胶凝粘结剂含量的利用率，这可以维持湿网络的完整性，从而防止孔隙进一步合并和老化。
