کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1504940 993748 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of a new modifier on the water-resistance of magnesite cement tiles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Effects of a new modifier on the water-resistance of magnesite cement tiles
چکیده انگلیسی

The magnesium oxychloride composite is an inorganic cementitious material with high bending and compression strength in air characteristics. However its strength decreases significantly after immersion in water. The preparing process of a new magnesite cement tile using nano rice husk ashes and a complex water-resistance agent as modifiers was described in the paper. The effects of low-temperature rice husk ashes (RHAs) and the complex water-resistance agent constituted with phosphoric acid, calcium superphosphate, wooden calcium and styrene-acrylic emulsion on the water-resistance of magnesite materials were mainly studied. The samples properties were characterized by XRD, SEM, BET, a laser particle size analyzer and bending test. The experiments show that the proportional addition of nano RHAs markedly increases the water-resistance of magnesite materials without reducing the bending strength and promotes the softening coefficient from 0.29 to 0.78, while the softening coefficient reaches up to 0.97 combined with the use of complex water-resistance agent. The new magnesite cement tiles prepared were not scumming, not warping, and not contracting at room temperature for 360 d.

The microstructure of magnesite materials with RHAs displays plate pattern gelling morphology, and well-distributed and densified, which are the features of hydraulicity inorganic cementitious materials. An amount of nano RHAs may make magnesite materials transform from an air hardening morphology to a hydraulicity morphology, and improve the water-resistance of the materials.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Sciences - Volume 14, Issue 1, January 2012, Pages 10–14
نویسندگان
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