Çimento esaslı harçlarda kolemanit konsantratör atığı (CW) ikamesinin gama ışını kalkanlama performansı, mekanik ve fiziksel özellikler üzerine etkisi

Abstract

Mevcut çalışma, çimento esaslı harçlarda kolemanit konsantratör atığı (CW) ikamesinin gama ışını kalkanlama performansı, mühendislik ve mikro yapısal özellikler üzerindeki etkilerini sunmaktadır. Çimento harçları, çimentonun ağırlıkça %20'sine kadar farklı oranlarda CW parçacıkları ikame edecek şekilde hazırlanmıştır. Mühendislik özelliklerini karakterize etmek için priz süresi, kıvam, basınç dayanımı, geçiş hızı, toplam ve kılcal su emilimi ve taramalı elektron mikroskobu (SEM) analizi gerçekleştirilmiştir. Gama ışını (Cs-137-662 keV) kalkanlama performansı deneysel bir çalışma ile araştırılmıştır. CW ikamesinin artması, basınç dayanımında bir azalmaya ve toplam su emiliminde, kıvamda ve priz süresinde bir artışa neden olmuştur. Malzeme kalınlığındaki artış, Cs-137 gama enerjisinin radyasyona nüfuz etme yeteneği ile birlikte kolemanit ilavesinin zayıflatma üzerindeki etkisini maskelemektedir. CW katkılı malzemeler ile benzer kalınlıktaki kontrol numunelerinin kurşun eşdeğer seviyeleri, özellikle en düşük kalınlıktaki malzemelerde yapılan ölçümlerde radyasyon zayıflatma etkisini açıkça ortaya koymaktadır.

Keywords

• Kolemanit konsantratör atığı
• Radyasyon zırhlama
• Gama ışını zırhlama
• Basınç dayanımı
• Çimento esaslı harç

Effect of Colemanite Concentrator Waste (CW) Substitution in Cement-Based Mortars on the Gamma-Ray Shielding Performance, Mechanical and Physical Properties

Abstract

This study investigates the influence of colemanite concentrator waste (CW) as a cement substitute on the gamma-ray shielding performance, mechanical, and physical properties of mortars. Mortar mixtures were prepared with varying CW proportions, and their consistency, setting time, compressive strength, pulse velocity, and water absorption were determined. Microstructural analysis using SEM and experimental gamma-ray (Cs-137-662 keV) shielding tests were also conducted. Results indicate that increasing CW substitution generally led to decreased compressive strength and increased total water absorption, consistency, and setting time. Notably, mixtures with CW content exceeding 5 wt% experienced disintegration during curing, primarily attributed to the significant retardation of cement hydration by boron compounds. For radiation shielding, despite the lower density of CW influencing overall bulk density, the presence of higher atomic number elements in colemanite demonstrated a positive contribution to gamma-ray attenuation. Specifically, at the lowest material thicknesses, the lead equivalent levels for CW2.5 and CW5 mortars were measured as 0.64 mmPb and 0.70 mmPb, respectively, revealing a clear radiation attenuation effect compared to the control. These findings highlight the potential of colemanite concentrator waste as a promising lead-free material for radiation shielding applications in cement-based composites.

Keywords

• Colemanite Concentrator Waste
• Radiation Shielding
• Gamma-Ray Shielding
• Compressive Strength
• Cement-Based Mortar

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