Investigation and Preparation of the Plastering Mortar for Autoclaved Aerated Blocks Walls

Abstract

The increase in the use of aerated concrete blocks (AAB) in construction walls has increased the demand for specialized plastering mortar, which should have the characteristics of high water retention, low water absorption, low thermal conductivity and high toughness. This study scrutinized the potential of expanded and vitrified small ball (EVSB) and expanded perlite as lightweight aggregates, and the beneficial effect of a modifying additive based on a mixture of ethylene-vinyl acetate (EVA), hydroxypropyl methylcellulose (HPMC) and fibers has been proved. The dry density, consistency, water absorption, mechanical strength, pore characteristics and micro morphology of the plaster mortar were evaluated. It is manifested by enhanced toughness, reduced dry density, and optimized pore structure characteristics. The relationship between mass water absorption and freeze-thaw cycle resistance is established, which shows that when the mass water absorption is 20%, the mortar exhibits better freeze resistance. After 25 freeze-thaw cycle tests, the mass loss was 0.26% and the strength loss was 1.41%. Through the comparison of test results, a new composition of plastering mortar is provided: cement: fly ash: water: heavy calcium carbonate: quartz sand: EVSB: EVA: HPMC (100,000 mPa·s): fiber = 70: 30: 76: 12: 250: 24: 2: 0.3: 0.2.

Comparison of locally manufactured composite tile adhesive using waste material with imported tile adhesive

“…Typically comprised of porous autoclaved aerated concrete block, this low-strength building material is produced using calcium and silicate materials like cement, lime, fly ash, and sand. As green building regulations demand energy-saving solutions, Chinese consumption of this concrete alternative to clay bricks has rapidly risen [11] producing around 110 million cubic meters of autoclaved aerated concrete blocks in 2015, with fly ash making up to 7% of its raw materials. As a result, the AAC block production generated scraps and wastes of approximately 3-5%, leading to large amounts of AAC residues.…”

Modelling the Influence of Composition on the Properties of Lightweight Plaster Mortar and Multicriteria Optimisation

“…Admixtures are supplied as powders, the typically used low dosages being 0.3–1.5% of the weight of the cement. The researchers have established [ 11 , 12 , 13 , 14 ] that the introduction of additives improves workability and lowers the water demand of the mix, confers air entrainment, or adds waterproofing qualities. These changes have the potential to decrease cracking through improvements in the paste–aggregate bond and to increase the strength of hardened mortars.…”