[논문]초기 재령에서 비소성 황토 혼입 고강도 콘크리트의 압축강도 발현 예측을 위한 초음파 속도법 검토

남영진; 김원창; 최형길; 김규용; 이태규

doi:10.14190/jrcr.2023.11.2.105

초기 재령에서 비소성 황토 혼입 고강도 콘크리트의 압축강도 발현 예측을 위한 초음파 속도법 검토
UPV Prediction Method on Compressive Strength of High Strength Concrete Mixed with Non-Sintered Hwangto at Early Age 원문보기

Journal of the Korean Recycled Construction Resources Institute = 한국건설순환자원학회 논문집, v.11 no.2, 2023년, pp.105 - 111

남영진 (세명대학교 소방방재공학과) , 김원창 (세명대학교 소방방재공학과) , 최형길 (경북대학교 건축공학과) , 김규용 (충남대학교 건축공학과) , 이태규 (세명대학교 소방방재학과)

초록
AI-Helper

본 연구에서는 초기 재령에서 NSH(Non-sintered Hwangto) 치환율에 따른 고강도 콘크리트의 역학적 특성을 평가하였다. NSH의 치환율은 15 % 및 30 %로 설정했다. 평가 항목은 압축강도와 UPV(Ultrasonic pulse velocity)로 설정하였으며, 최종적으로 UPV분석을 통해 압축강도 예측 방정식을 제안하였다. 압축강도와 UPV에서는 NSH 치환율이 증가할수록 낮은 강도 및 UPV를 보였다. 또한 압축강도와 UPV의 상관관계 분석 결과, 상관계수(R2)는 NC33(Normal concrete)은 0.99, NSHC(Non-sintered Hwangto Concrete)33-15는 0.97, 그리고 NSHC33-30은 0.94로 높은 상관관계를 나타냈다.

Abstract ▼ AI-Helper

In this study, the mechanical properties of high-strength concrete according to the substitution rate of NSH(Non-sintered Hwangto) as an alternative material for cement were measured and evaluated. Through UPV(Ultrasonic pulse velocity) analysis, the compressive strength prediction equation was proposed, and the substitution rate of NSH was set at 15 % and 30 %. The evaluation items were compressive strength and UPV, and the curing period was set to 24 hours. In compressive strength and UPV, as the NSH substitution rate increased, lower strength and lower UPV were shown. In addition, the correlation number(R2 ) between compressive strength and UPV was 0.99 for NC(Normal Concrete), 0.97 for NSHC(Non-sintered Hwangto Concrete)33-15, and 0.94 for NSHC33-30.

주제어

표/그림 (14)

표 Table 1. Experimental plan
표 Table 2. Physical properties of materials
표 Table 3. Chemical properties
그림 Fig. 1. UPV measurement schematic diagram
표 Table 4. Mix proportions of the mortar and concrete
표 Table 5. Experimental plan
그림 Fig. 2. Compressive strength of NC and NSHC
그림 Fig. 3. UPV of NM and NSHM
그림 Fig. 4. UPV of NC and NSHC
그림 Fig. 5. Comparison of UPV of mortar and concrete
그림 Fig. 6. Comparison by replacement rate
그림 Fig. 7. Correlation between compressive strength and UPV
그림 Fig. 8. Comparison with existing prediction models
표 Table 6. Prediction model of compressive strength of existing concrete mixed materials

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