This study presents research on the effect of Portland cement (PC) replacement with metakaolin mechanical behavior flax textile-reinforced cementitious matrices (TRCM). The composition and in-situ fibres was determined using X-ray diffraction thermogravimetric analysis, while reinforcement efficiency textile TRCMs investigated by three-point bending tests finite element analysis. High amounts P...

Various papers based on high performance concrete (HPC) and their behaviour were studied. HPC’s containing different mineral as well as chemical admixtures exhibits different properties in fresh as well as hardened states. Several factors determine these properties like: type of mineral as well as chemical admixture, type of aggregates, water-cement ratio, curing method etc. Each paper takes in...

This study presents the effect of incorporating metakaolin (MK) on the mechanical and durability properties of high strength concrete for a constantwater/binder ratio of 0.3.MKmixtureswith cement replacement of 5, 10 and15 %weredesigned for target strength and slump of 90 MPa and 100 ± 25 mm. From the results, it was observed that 10 % replacement level was the optimum level in terms of compres...

Metakaolin (MK) prepared by the calcination of kaolin at 550 °C and fly ash (FA) from combustion black coal in a granulating boiler were used to prepare unfired ceramic bonding systems via alkali activation process. A long-term stability mechanical properties samples similar was observed. The optimal metakaolin ratio, type activator (NaOH or water glass) its concentration evaluated after hydrat...

-The reaction of kaolin with NaC1 was followed by dynamic thermal analysis and mass spectrometry under/'42, CO2, and air atmospheres and in a 10-5-torr vacuum. The weight loss was a function of the atmosphere used and, according to mass spectrometry, was due to the evolution of H20, HC1, and very small amounts of H2. HC1 was formed only after the release of 85% of the hydroxyl content of the ka...

This study presents a discussion on the effects of different solid-to-liquid (S/L) ratios (0.97 to 1.19) and nanoSiO2 (NS) percentages (0% to 3%) on some properties of metakaolin (MK)-based geopolymers. The setting time and compressive strength were investigated. Mercury intrusion porosimetry, fourier transform infrared spectroscopy, and scanning electron microscopy were used to determine the m...

fiber reinforced concrete (frc) has been widely used due to its advantages over plain concrete such as high energy absorption, post cracking behaviour, flexural and impact strength and arresting shrinkage cracks. but there is a weak zone between fibers and paste in fiber reinforced concretes and this weak zone is full of porosity, especially in hybrid fiber reinforced concretes. so it is necess...

The preparation and the characterization of novel geopolymer-based hybrid composites are reported. These materials have been prepared through an innovative synthetic approach, based on a co-reticulation in mild conditions of commercial epoxy based organic resins and a metakaolin-based geopolymer inorganic matrix. This synthetic strategy allows the obtainment of a homogeneous dispersion of the o...