کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
257125 503577 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Physico-mechanical characteristics and durability of calcium aluminate blended cement subject to different aggressive media
ترجمه فارسی عنوان
خصوصیات فیزیکی-مکانیکی و دوام سیمان مخلوط کلسیم آلومینات با توجه به رسانه های پرخاشگرانه
کلمات کلیدی
طول عمر سرباره تهویه هوا، سرباره آب سرد و سیمان آلومینات کلسیم
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی


• Compressive strength of CAC pastes is lower than CAC–WCS and CAC–ACS pastes.
• 20 mass% of CAC–WCS or CAC–ACS improve the physico-mechanical properties of CAC-blended pastes.
• Compressive strength of CAC–WCS pastes are higher than those of CAC–ACS pastes.
• Compressive strength of CAC in aggressive solution increases at 90 days, then decrease up to 120 days.
• The thin flaky-plate like of C2ASH8 reflects the closed and compact texture in aggressive solutions.

Three mixes were prepared from calcium aluminate cement (CAC) and 20 mass% water-cooled (WCS) slag or air-cooled slag (ACS). The pastes were prepared with the required water of standard consistency, cured under tap water until time of testing (1, 3, 7 and 28 days). The durability of calcium aluminate blended cement was investigated by immersing the samples under tap water for 7 days (zero time), and then immersed in 5% sodium chloride, 5% magnesium sulphate and 5% ammonium sulphate as aggressive media. Compressive strength, bulk density and apparent porosity were measured. X-ray diffraction analysis and scanning electron microscopy were studied to reveal their mineralogical and microstructural features. Compressive strength of neat CAC pastes are lower than those of CAC–WCS and CAC–ACS blends. Compressive strength of CAC pastes immersed in 5% NaCl, 5% MgSO4 or 5% (NH4)2SO4 increases with curing time up to 90 days and then shows a slightly decrease up to 120 days immersion time. The presence of Cl− or SO42− ions activates the hydration rate of CAC, CAC–WCS and CAC–ACS. The SEM micrographs of CAC–WCS and CAC–WCS indicate the presence of the thin flaky-plate like morphology of C2ASH8 and thin fibrous particles of C–S–H I,II, which reflects closed and compact texture.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 78, 1 March 2015, Pages 379–385
نویسندگان
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