Abstract
This study aims to investigate the effect of adding circulating fluidized bed combustion (CFBC) ash, desulfurization slag, air-cooled blast-furnace slag and coal bottom ash to the controlled low-strength material (CLSM). Test methods include slump flow test, ball drop test, water soluble chloride ion content measurement, compressive strength and length change measurement. The results show that (1) the use of CFBC hydration ash with desulfurization slag of slump flow is the best, and the use of CFBC hydration ash with coal bottom ash and slump flow is the worst; (2) CFBC hydration ash with desulfurization slag and chloride ion content is the highest; (3) 24 h ball drop test (diameter ≤ 76 mm), and test results are 70 mm to 76 mm; (4) CFBC hydration ash with desulfurization slag and compression strength is the highest, with the coal bottom ash being the lowest; increase of CFBC hydration ash can reduce compressive strength; and (5) the water-quenched blast furnace slag and CFBC hydration ash would expand, which results in length changes of CLSM specimens.
Highlights
Flourishing economic development, rapid increase in population, and the vigorous promotion of various public works in Taiwan in recent years have led to the heavy consumption of cement materials.Cement production generates a fair amount of pollution and produces a ton of carbon dioxide for every cubic meter of cement consumed
All of the mixtures displayed slump flow values greater than 40 cm, which conformed to the performance requirements for general flowability grade for controlled low-strength material (CLSM)
The specimens all showed compressive strength lower than stipulated strength lower than stipulated by the Construction Commission of the Executive Yuan (8.82 MPa), by the Construction Commission of the Executive Yuan (8.82 MPa), thereby indicating that the mixtures thereby indicating that the mixtures can be applied to CLSM
Summary
Flourishing economic development, rapid increase in population, and the vigorous promotion of various public works in Taiwan in recent years have led to the heavy consumption of cement materials.Cement production generates a fair amount of pollution and produces a ton of carbon dioxide for every cubic meter of cement consumed. It was a combustion technology that quickly developed in the last two decades and offers high efficiency and low pollution (less NOx and SO2 emissions) [3,4]. It offers high efficiency, low pollution, good coal adaptability, strong load adjustment capacity, relatively low costs, and relatively easy-to-grasp technology [5,6,7]. Low pollution, good coal adaptability, strong load adjustment capacity, relatively low costs, and relatively easy-to-grasp technology [5,6,7] In another aspect, gravel excavation is limited in Taiwan, thereby creating an imbalance in supply and demand. For this reason, developing aggregate alternatives and promoting the utilization of industry by-products can effectively
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