تعرض الحريق وتأثيره على الخرسانة الهيكلية المستدامة ذاتية الدمك والخفيفة الوزن المحتوية على نفايات الزجاج والألياف الفولاذية الدقيقة
محتوى المقالة الرئيسي
الملخص
تدرس هذه البحث الأداء الميكانيكي والفيزيائي والميكروهيكلي للخرسانة الخفيفة ذاتية الدمك (SLWSCC) باستخدام الزجاج المعاد تدويره كبديل جزئي للرمل الطبيعي وكذلك الألياف الفولاذية الدقيقة كتعزيز، والتي يجب أن تكون سلوكها تحت ظروف درجات الحرارة العالية. سيركز البحث أيضًا على تحسين الاستدامة ومقاومة الحريق والأداء الهيكلي للخرسانة الخفيفة وتقليل آثار التخلص من النفايات. تم إعداد أربع خلطات، الخلطة الضابطة (REF) وثلاث خلطات معدلة، والتي تضمنت 20 و30 و40 بالمئة من زجاج النفايات الذي يزن 30 بالمئة من الرمل، مدعومة بنسبة 1 بالمئة من ألياف الصلب الدقيقة. تم استخدام اختبارات تدفق الانهيار، وقمع V، وصندوق L لتحديد الخصائص الطازجة بناءً على إرشادات EFNARC للتحقق من سلوك الانضغاط الذاتي. تم قياس خصائص الصلابة عند 200، 400، 600، و800 درجة مئوية، قبل وبعد التعرض لدرجات حرارة 200، 400، 600، و800 درجة مئوية، لتقييم مقاومة الضغط، مقاومة الشد الانشطاري، الكثافة، وامتصاص الماء. تم التعرض للظروف الحرارية في فرن كهربائي، وبعد ذلك تم إدخال ظروف التبريد بالهواء والرغوة. كشف تحليل المجهر الإلكتروني الماسح (SEM) للميكروهيكل عن معلومات حول سلامة المصفوفة وتطور المسام وكذلك ارتباط الألياف بالمصفوفة عند درجات الحرارة العالية.
أظهرت النتائج أن خبث الزجاج المعاد تدويره عزز بشكل كبير قوة وكثافة القيم في الظروف المحيطة بسبب تأثير التعبئة الدقيقة. كان مزيج G30+MS (30% زجاج + 1% ألياف فولاذية) هو الأكثر فعالية بقوة ضغط أعلى بنسبة 9.2% (52.2 ميغاباسكال) مقارنة بمزيج التحكم؛ حيث احتفظ بنسبة 35% من قوته عند 800 درجة مئوية، وهو ما كان أعلى من مزيج المرجع. كانت الألياف الفولاذية الدقيقة قادرة على الحد من انتشار الشقوق وتجنب التقشر، مما حافظ على السلامة الهيكلية للمركب بعد التعرض للنار. أكد تحليل SEM وجود مصفوفة أكثر كثافة وفتحات واجهة أقل في أفضل مزيج.
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