Investigations of Forming Mixture Parameters of Autoclaved Aerated Concrete with Nanoadditives

Abstract

Impact of some nanoadditives, such as amorphous SiO₂ (AS) of pozzolanic properties and carbon fibers (CF) reduced to nanosize particles on autoclaved aerated concrete (AAC) forming mixtures, the following parameters were investigated: changes in consistence of binding material during hydration, spreadability, expansion and temperature of mixture, plasticity strength. The investigations were carried out with AAC forming mixture where 10 % lime was replaced by equivalent content of Portland cement. Upon completion of investigations, it was established that the optimal replacement of sand by AS was 1.0 % resulting in increase of temperature of AAC forming mixture by up to 2.1 %, expansion by up to 11.0 %, ultrasonic impulse velocity (UIV) by up to 3.0 % and plasticity strength by up to 271.4 %. Meanwhile the optimal replacement of sand by CF was 0.1 % resulting in decrease in temperature of AAC forming mixture by up to 1.5 %, expansion by up to 16.0 % and increase in UIV by up to 2.0% and plasticity strength by up to 152.9 %.<p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.18.3.2441">http://dx.doi.org/10.5755/j01.ms.18.3.2441</a></p

Utilization of Solid Waste in the Production of Autoclaved Aerated Concrete and Their Effects on its Physio-mechanical and Microstructural Properties: Alternative Sources, Characterization, and Performance Insights

“…At 1.0% of optimum replacement of sand by AS in the AAC mix, expansion of the forming mixture of AAC was increased by 11.0%. Temperature of the forming mix increased by 2.1%, compressive strength increased by 271.4%, and, ultrasonic impulse velocity (UIV) also increased by 3.0% (Lekūnaitė et al, 2012); whereas, the optimal substitution of CF with sand by 0.1% decreased the temperature of forming mixture up to 1.5%, increased in volume up to 16.0% and increased in UIV up to 2.0% and increased plasticity strength up to 152.9% (Lekūnaitė et al, 2012).…”

Research of Producing Aerated Concrete with Quartz Tail-Sands

“…The appropriate ratio of water to material is to make a slurry with a certain degree of fluidity, keep the appropriate limiting shearing stress, provide the necessary conditions for the expansion, and form ideal pore structure, so that final product may obtain higher strength and lower shrinkage value. If ratio of water to material is too high, that will result in pore deformation and mode collapse, if it is too low, result in sluggish gas evolution and uneven bubbles [1].…”