Engineering Properties of Lightweight Concrete Masonry Units Made from Sedimentary Lightweight Aggregates

淤泥輕質粒料混凝土圬工單元之工程性質

湯兆緯(Chao-Wei Tang)

《中國土木水利工程學刊》 22卷1期 (2010/03) Pp. 55-64

https://doi.org/10.6652/JoCICHE.201003_22(1).0005

摘要

本文係以水庫淤泥燒製的輕質粒料為主要材料，利用商業運轉設備研發輕質混凝土圬工單元（Concrete masonry unit，簡稱CMU）之產製技術。此外，亦探討水膠比（W/CM）、漿體填充粗粒料孔隙體積比（F（下標 v））、砂佔砂漿體積百分比（F（下標 m））及爐石取代水泥之重量百分比（S（下標 c））對所產製CMU工程性質之影響。試驗結果顯示，所產製CMU其單位重介於1585 ~ 1743 kg/立方公尺之間（較常重CMU者輕約30 ~ 25%）；抗壓強度介於8.4 ~ 18.7 MPa之間；吸水量介於0.05 ~ 0.13 g/立方公分之間；透水性介於0.2 ~20 cm之間；熱傳導係數介於0.27 ~ 0.41 W/m．K之間。本研究顯示，以淤泥輕質粒料為粗粒料應用於不同的混凝土配比，可利用現代化廠房之自動生產機具產製出性能優異的輕質粒料混凝土圬工單元，其各項工程性質皆符合中國國家標準（CNS）之規定。

關鍵字

淤泥輕質粒料 ； 混凝土圬工單元 ； 工程性質

並列摘要

In this research, the production technologies for concrete masonry unit (CMU) made from sedimentary lightweight aggregate (LWA), which was produced by expanding under heat reservoir sediments, were developed using a commercially available apparatus. In addition, the effects of water to cementitious material ratio (W/CM), filling ratio of paste or mortar in voids between coarse aggregate particles (F(subscript v)), filling ratio of sand in mortar (F(subscript m)), and cement replacement level by slag (S(subscript c)) on the engineering properties of CMU produced were also investigated. Test results of representative CMU specimens show that unit weight ranged from 1585 to 1743 kg/m^3, which was 30-25% lower than that for a normal weight CMU (2300 kg/m^3); compressive strengths ranged from 8.4 to 18.7 MPa; water absorption was found to vary between 0.05 to 0.13 g/cm^3; moisture content of maximum water absorption ranged from 31% to 59%; water permeability ranged from 0.2 to 20 cm; and thermal conductivity ranged from 0.27 to 0.41 W/m⋅K. The research findings demonstrate that the use of sedimentary LWA as coarse aggregate in various concrete mixtures could produce high performance lightweight CMU by automatic machinery in a modern plant, which comply with the requirements of Chinese National Standards (CNS) standards.

並列關鍵字

sedimentary lightweight aggregate ； concrete masonry unit ； engineering property