The Feasibility of Desulfurization/Granulated Slag Resources Recovery on the Controlled Low Strength Material WithoutPortland Cement

• Main Authors: Ming Wei Weng, 翁明偉
• Other Authors: Wen-Ten Kuo
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/81274797448076799696

碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 95 === Desulfurization slag, steel-making procedure in The Chinese Steel Company, is the general industrial wastes that can utilize again. It can be regarded as the soda catalyst of granulated slag to proceed pozzolanic reaction, because which is a material of the high pH, content of the heavy metal is rare, content of high CaO and compositions are similar to portland cement. This investigate is an experimental studies of slag cement mortar/CLSM made with granulated/desulfurization slag and without Portland cement, and the natural aggregate be replaced with desulfurization slag aggregate. The important physical-chemical properties needed to be analyzed, including fundamental properties, composition and micro nature of the material, and fresh, hardening, and micro-structure of slag cement mortar/CLSM. The test results show that desulfurization slag can offer enough soda environment, make granulated slag proceed pozzolanic reaction. The content and fineness of granulated slag increased will cause quick setting. And content of desulfurization slag will shorten the spacing interval of initial and final setting time. In addition, the mortar which made with stone, at 28-days compressive strength reaches 42~104 kgf/cm2. The majority can accord with CLSM that 28-days compressive strength does not exceed 84 kgf/cm2. Observation of SEM and XRD, hydrate is mainly calcium carbonate, C-A-M-S crystal and continuous netted gel. And influence of compressive strength is about with whether or not be restrained changed hydrate into C-S-H gel and content of Ca(OH)2. Initial setting time of CLSM is between 7~12.5 hours, it accords with the regulation of normal CLSM. Slump, slump flow and 28-days compressive strength is between 24~28 cm, 49.5~84.0 cm, and 15~27 kgf/cm2 respectively, it accords with the regulation of non-normal CLSM. And the compressive strength increasing degree of later age is small. It accords with the definition of easy re-excavate of CLSM. So the result of study proves the all right recycle treatment of granulated slag and desulfurization slag is in concrete without Portland cement, and applies to CSLM actually.