Mechanical and Physical Properties of Autoclaved Aerated Concrete Reinforced Using Carbon Fibre of Different Lengths

Abstract

In this study, series of tests have been conducted to indicate the mechanical and physical properties (compressive strength, flexural strength, dry density, thermal conductivity and shrinkage) of autoclaved aerated concrete (AAC) reinforced with carbon fibres of different lengths. AG2/350 AAC block specimens without carbon fibre were prepared as a control specimen. The mixtures were prepared by replacing 0.5% weight of cement in the AAC with 4 mm, 6 mm, 12 mm length carbon fibres and these mixtures were poured into moulds and subjected to 58 °C for 4 hours to expand until reaching workable hardness. After preliminary curing, the produced AAC specimens were subjected to 180 °C and pressure of 11 bar for 6 hours in a steam cure until required hardness. The mechanical and physical properties of the reference and the fibre reinforced AAC specimens were determined and compared to each other. As a result, the use of 12 mm fibre reinforcement in AAC gave the best performance in comparison to the other fibre reinforcements of different lengths by increasing compressive strength for 10.63%, flexural strength of 31.48% and thermal conductivity up to 4.23% while reducing the shrinkage ratio to 51.47%. Herein for the specimen using 0.5% replacement of the AAC in weight with 12 mm carbon fibre is recommended.

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

“…The samples in Figure 2a-c were produced using QWF, ESP, and OPC, following a Ca/Si ratio of 0.8 in the formulation [32][33][34]. The mixture proportions used to prepare the samples are displayed in Table 1.…”

“…Furthermore, only a Ca/Si ratio of 0.80 was followed in the mixture preparation of QWF-ESP samples [30][31][32]. Meanwhile, the hydrothermal conditions were fixed at 180 • C for 6 h [23,24,[33][34][35].…”

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

“…The slurry was then poured and cast into the cubic mold. After the cast mixture was hardened, it was de-molded and autoclaved at 180 °C for 6 hours [25,26,[35][36][37]. The control sample used was formulated with the traditional raw materials, lime and silica with only 10% OPC while the Ca/Si ratio, water-solid ratio, and autoclaving conditions are consistent with the QWF-ESP samples.…”

“…Furthermore, only a Ca/Si ratio of 0.80 was followed in the mixture preparation of QWF-ESP samples [32][33][34]. Meanwhile, the hydrothermal conditions were fixed at 180 °C for 6 hours [25,26,[35][36][37].…”

The Influence of Material Storage on Mechanical Properties and Deterioration of Composite Materials

“…This process was developed by the company called MarkForged, and it requires the deposition of fibrethermoplastic filaments layer-by-layer where a hot extrusion process is used to construct the composite material. It has been used to 3D print parts that are reinforced with continuous fibres of carbon [6][7][8][9], glass [10][11][12], aramid [13,14] and jute [15,16].…”