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.
Highlights
Autoclaved aerated blocks (AABs) have been used in load-bearing and non-loadbearing structures of buildings since the mid-1920s, because of its lower density, good fire resistance, excellent sound insulation and thermal insulation [1], relative excellent impermeability [2] and high resource utilization efficiency [3,4]
These autoclaved blocks would be cut to meet the suitable size for use. This would allow continuous capillary pores to be formed on the cut surface of AABs, while pores in the interior would be closed and discontinuous. This means that AABs can absorb water at the surface, but the degree of water absorption and relieving humidity is very slow [6]
It was found that the single-sided continuous water absorption of AABs with a density of 500 kg/m3 is 10% at 21 days
Summary
Autoclaved aerated blocks (AABs) have been used in load-bearing and non-loadbearing structures of buildings since the mid-1920s, because of its lower density, good fire resistance, excellent sound insulation and thermal insulation [1], relative excellent impermeability [2] and high resource utilization efficiency [3,4]. These have a positive effect on the Previous researchers have identified that cellulose and polymers (liquid resins, latexes, re-dispersible powders and water-soluble homopolymers or copolymers) can improve the water retention capacity of mortar [6,8] The high bonding strength of the plaster mortar was not re-dispersible emulsion powder was 1.2%, the tensile bond strength increased by 18.9%, necessary, because the AABs arewas lightweight, porous, low-density materials. For the plastering of AAB walls, mortars made from lightweight aggregates are widely used at present, and the average density ranges within 1000–1400 kg/m3. This brings a discrepancyThe in the deformation characteristics between mortar and400600. The technical parameters and performance improvement mechanism were clarified in this study to provide a technical reference for the application field
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