In this paper, the availabilities of cement kiln dust (CKD) are investigated to verify the applicability as mineral admixture. Generally, CKD can be gathered at rotary kiln during the manufacturing process of cement. Without proper measure such as recycling and cleaning it, occurrence of CKD is the ...
In this paper, the availabilities of cement kiln dust (CKD) are investigated to verify the applicability as mineral admixture. Generally, CKD can be gathered at rotary kiln during the manufacturing process of cement. Without proper measure such as recycling and cleaning it, occurrence of CKD is the one of the reasons to block rotary kiln, which causes loss of burning efficiency in rotary kiln. From all over the world, environmental concerns have been one of the serious issues to work out. Many countries have been focused on the reducing environmental problem and recycling of demolished resources. Recycle of CKD can be one of the desirable method to reduce environmental problems in the side of effective resource reuse. For this reason, in this paper, tests are carried out to provide useful application method of CKD as cement replacement materials. CKD is mainly composed of CaO and has a fine particle in itself. Some researchers reported that use of CKD contributed to improve compressive strength and accelerate the setting time at low temperature. Firstly, physical and chemical analysis of CKD with 7 different manufacturing company are conducted using micro structure measuring and monitoring equipments such as scanning electronic microscope(SEM) and ICP. Cement mortar and concrete are made with different mixture proportion and water to binder ratio, replACIng method. In the future, mock-up and field test will be carried out. This paper is composed of 6 chapter. In chapter 1, scope and background of the paper is described, and in chapter 2, theoretical investigation on the use of CKD is discussed. In chapter 3, physical and chemical analysis of CKD is carried out using monitoring instruments. In chapter 4, experiments on the cement mortar and concrete are performed under various experimental factor. In chapter 5, field test results will be discussed. Finally, in chapter 6, conclusion of the paper is drawn. Followings could be drawn as part of conclusion. (1) Under low curing temperature, use of CKD resulted in a reduction in setting retarding, whereas FA and BS retarded the setting time of cement mortar. For compressive strength, high curing temperature and age leaded to an increase in compressive strength of concrete. Under low curing temperature, the use of CKD resulted in an enhancement of compressive strength at early stage, and exhibited a similar level of compressive strength with plain concrete. For this reason, use of CKD in cold weather concreting has positive effect on strength development at low curing temperature under early age. (2) At low curing temperature, setting time of concrete with mineral admixture is delayed compared with that of plain concrete. But, use of CKD has a desirable effect on reducing setting retard under low curing temperature. For compressive strength, concrete with FA and BS have low strength at early stage compared with that of plain concrete under low curing temperature. However, the use of CKD resulted in an enhancement of compressive strength at early stage under low curing temperature, and exhibited a similar level of compressive strength with plain concrete. For this reason, use of CKD in cold weather concreting has positive effect on strength development at low curing temperature under early age. (3) An increase in W/B retarded setting time greatly in 5℃, while accelerated in 20℃. For fluidity, an increase in slump delayed the setting time with dosage of SP agent. The presence of CKD has little influence on setting time compared with plain concrete. For compressive strength, an increase in maturity enhanced compressive strength. Fluidity had no relation to compressive strength. At low curing temperature, concrete with CKD has slight strength loss compared with plain concrete. However, remarkable strength loss at low curing temperature in early stage was not found, which can be applicable to low temperature environment concrete placing.
In this paper, the availabilities of cement kiln dust (CKD) are investigated to verify the applicability as mineral admixture. Generally, CKD can be gathered at rotary kiln during the manufacturing process of cement. Without proper measure such as recycling and cleaning it, occurrence of CKD is the one of the reasons to block rotary kiln, which causes loss of burning efficiency in rotary kiln. From all over the world, environmental concerns have been one of the serious issues to work out. Many countries have been focused on the reducing environmental problem and recycling of demolished resources. Recycle of CKD can be one of the desirable method to reduce environmental problems in the side of effective resource reuse. For this reason, in this paper, tests are carried out to provide useful application method of CKD as cement replacement materials. CKD is mainly composed of CaO and has a fine particle in itself. Some researchers reported that use of CKD contributed to improve compressive strength and accelerate the setting time at low temperature. Firstly, physical and chemical analysis of CKD with 7 different manufacturing company are conducted using micro structure measuring and monitoring equipments such as scanning electronic microscope(SEM) and ICP. Cement mortar and concrete are made with different mixture proportion and water to binder ratio, replACIng method. In the future, mock-up and field test will be carried out. This paper is composed of 6 chapter. In chapter 1, scope and background of the paper is described, and in chapter 2, theoretical investigation on the use of CKD is discussed. In chapter 3, physical and chemical analysis of CKD is carried out using monitoring instruments. In chapter 4, experiments on the cement mortar and concrete are performed under various experimental factor. In chapter 5, field test results will be discussed. Finally, in chapter 6, conclusion of the paper is drawn. Followings could be drawn as part of conclusion. (1) Under low curing temperature, use of CKD resulted in a reduction in setting retarding, whereas FA and BS retarded the setting time of cement mortar. For compressive strength, high curing temperature and age leaded to an increase in compressive strength of concrete. Under low curing temperature, the use of CKD resulted in an enhancement of compressive strength at early stage, and exhibited a similar level of compressive strength with plain concrete. For this reason, use of CKD in cold weather concreting has positive effect on strength development at low curing temperature under early age. (2) At low curing temperature, setting time of concrete with mineral admixture is delayed compared with that of plain concrete. But, use of CKD has a desirable effect on reducing setting retard under low curing temperature. For compressive strength, concrete with FA and BS have low strength at early stage compared with that of plain concrete under low curing temperature. However, the use of CKD resulted in an enhancement of compressive strength at early stage under low curing temperature, and exhibited a similar level of compressive strength with plain concrete. For this reason, use of CKD in cold weather concreting has positive effect on strength development at low curing temperature under early age. (3) An increase in W/B retarded setting time greatly in 5℃, while accelerated in 20℃. For fluidity, an increase in slump delayed the setting time with dosage of SP agent. The presence of CKD has little influence on setting time compared with plain concrete. For compressive strength, an increase in maturity enhanced compressive strength. Fluidity had no relation to compressive strength. At low curing temperature, concrete with CKD has slight strength loss compared with plain concrete. However, remarkable strength loss at low curing temperature in early stage was not found, which can be applicable to low temperature environment concrete placing.
주제어
#시멘트 킬른더스트 물리적 특성
※ AI-Helper는 부적절한 답변을 할 수 있습니다.