Chế tạo cốt liệu tro bay và ứng dụng cốt liệu tro bay trong vữa xi măng

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Tác giả: ANH KIỆT BÙI, THỊ THÚY VI ĐOÀN, THỊ BÍCH THỦY NGUYỄN

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.94

Bộ sưu tập: Metadata

ID: 451217

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Mục đích chính của nghiên cứu là chế tạo ra cốt liệu từ tro bay và sử dụng cốt liệu tro bay để thay thế một phần cốt liệu tự nhiên trong vữa. Nghiên cứu này, tro bay được kết hợp với xi măng, và thủy tinh lỏng, cốt liệu được sấy ở 100°C trong vòng 24 giờ đồng hồ để tạo độ cứng. Cốt liệu tro bay được sử dụng để thay thế cát theo tỉ lệ 0%, 10%, 30%, và 50% theo thể tích trong vữa xi măng. Độ chảy xòe và cường độ chịu nén của vữa tại hai điều kiện dưỡng hộ khác nhau được khảo sát. Một là mẫu được ngâm trong nước toàn thời gian. Hai là nhóm mẫu được dưỡng hộ 7 ngày trong nước sau đó giữ trong không khí. Kết quả thu được rằng độ chảy xòe của hỗn hợp vữa giảm khi tỉ lệ thay thế cát bằng cốt liệu tro bay tăng lên. Trong điều kiện dưỡng hộ kết hợp 7 ngày trong nước rồi giữ trong không khí, cường độ chịu nén của vữa sử dụng 10% cốt liệu tro bay cao hơn mẫu đối chứng. Cường độ của vữa sử dụng cốt liệu tro bay tại 28 ngày và 91 ngày tuổi được cải thiện khi vữa được dưỡng hộ trong điều kiện không chuẩn (trong không khí) khi so sánh với mẫu ngâm hoàn toàn trong nước. Từ khóa: Cốt liệu tro bay
độ chảy xòe
cường độ chịu nén
vữa xi măng
dưỡng hộ.The aim of the research are to create aggregates from fly ash and use fly ash aggregates to partially replace natural aggregates in mortar. In this study, fly ash was combined with cement, and liquid glass. Fly ash aggregates were dried at 100°C for 24 hours to create hardness. Fly ash aggregates were used to replace sand in proportions of 0%, 10%, 30%, and 50% by volume in cement mortar. The flow and compressive strength of the mortar under two different curing conditions were investigated. The first, the samples were immersed in water full time. Second, the samples were cured for 7 days in water and then kept in air. The results were shown that the flow of the mortar was decreased as the sand replacement ratio with fly ash aggregate increased. Under combined curing conditions of 7 days in water and then kept in air, the compressive strength of mortar using 10% fly ash aggregate was higher than that of the control sample. The strength of mortar using fly ash aggregates at 28 days and 91 days of age was improved when mortar was cured under non-standard conditions (in air) when compared to samples completely immersed in water. Keywords: Fly ash aggregate
flow
compressive strength
mortar
curing.

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