• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 1992년도 가을 학술발표회 논문집
• /
• pp.54-57
• /
• 1992

This report presents the survey findings on the proportioning of ready mixed, concrete mixtures. According to this report, the W/C ratio and S/A ratio, based upon the type 25-210-12, in mix proportion of ready mixed concrete are 53% and 45% respectively. The problems to be improved, coming out in this study, are (1)using the adequate quantity of cement (2) alternation of mix design cope with the change of kinds of aggregates (3)large standard error in the mix proportion.

• 한국구조물진단유지관리공학회 논문집
• /
• 제10권3호
• /
• pp.133-142
• /
• 2006

본 연구에서는 레미콘 제품에 Mix Design Nomogram을 적용하여 배합변수에 따른 파괴에너지 예측뿐만 아니라 파괴에너지에 따른 배합변수 예측을 가능하도록 하는데 그 목적이 있다. Mix Design Nomogram 작성을 위한 실험은 레미콘 생산회사의 실제 시방배합표를 사용하였으며, RILEM 50-FMC 위원회에서 제안한 3점 휨 실험을 실시하였다. 그 결과, 레미콘 제품에 파괴에너지가 예측 가능한 Mix Design Nomogram의 적용 가능성을 확인하였으며, 이를 이용한 프로그램 개발로 레미콘 배합설계 자동화를 위한 가능성을 확인하였다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
• /
• pp.979-984
• /
• 2003

Quality control of ready-mixed concrete is most important in the production step because, the performance of hardened concrete is revealed due to ready-mixed concrete. Hardened concrete has several properties physically. Above all things compressive strength of concrete has a greate effect in the design of structures, analysis, and durability. Compressive strength is simple predicted by w/c up to date, but there are some limits because different compressive strengths can be revealed in the same w/c. Therefore this study contributes to the quality control of ready-mixed concrete through statistical analysis for the relation between mix factors in mix design and compressive strength, predictable equation for compressive strength.

• 대한토목학회논문집
• /
• 제6권1호
• /
• pp.69-78
• /
• 1986

레디믹스트 콘크리트의 품질은 시멘트의 품질, 골재의 입도 및 표면수 등과 같은 사용재료의 변화에 의하여 크게 변화하므로, 사용재료의 변화상태를 신속히 파악하여 배합계산에 반영함으로써 품질변화를 최대한 방지해야 한다. 본 논문에서는 레디믹스트 콘크리트의 배합계산에 컴퓨터를 사용함으로써 재료의 변화상태에 따른 배합수정을 정확하고 신속하게 처리하여 시방배합, 현장배합 및 배치량을 계산할 수 있는 프로그램을 작성하였다.

• 한국생활과학회지
• /
• 제20권1호
• /
• pp.155-168
• /
• 2011

This study aims at analyzing the Mix & Match fashion trend expressed in the Ready to Wear collections shown in 27 collections of 3 designers(Alexander McQueen, Jean Paul Gaultier, Comme des Gar$\c{c}$ons) over the past five years from 2007S/S to 2011S/S, and the results are as follows. 1) The characteristics were a combination of past and modern, the past and past prominent fashions combined at a different time, these styles and details were seen in Alexander McQueen's collection. 2) The properties of combination were expressed as a clash of cultures, such as East and West or African and European. 3) The characteristics of the combinations were expressed by differences in purpose, such as outer garments or underwear. 4) Artistic combinations of Mixing & Matching happen through a component confusion of art and garments. 5) The characteristics of Mixing & Matching fashion were expressed in images, especially in the case of Jean Paul Gaultier.

• 레미콘
• /
• 7호통권72호
• /
• pp.29-41
• /
• 2002

The purpose of this study is to investigarte the mix design method and the mechanical properties of High stength Lightweight Concrete (HSLC). In the experment, concrete mixing was conducted to select the optimum mix design for HSLC in laboratory. Also, concrete mixing in ready mix design. As a result, it is possible to establish the mix design of HSLC according to the using these experimental results ;the estimate equation for unit weight of HSLC. the relationship between W/C and compressive strength of HSLC and the fluidity of HSLC in the view of workability

• 대한토목학회논문집
• /
• 제31권5C호
• /
• pp.187-202
• /
• 2011

레디믹스트 숏크리트의 적용성 평가에서는 기초 연구 결과를 바탕으로 현장실험을 통해 기존 현장배합 방식과의 품질 비교를 수행하였고, 지보재로서 장기적인 내구성 평가를 실시하였다. 그리고 규격화된 재료 생산을 위한 공장생산 시스템을 도출하고 시제품 생산도 실시하였다. 실제 시공현장에서 가장 효과적인 적용을 위해 일체형 사일로 믹서 설계 및 반영된 현장시공 시스템을 제안하였다. 또한, 시공성 및 경제성 평가를 통해 기존 현장배합 방식보다 우수한 적용 가능성을 확인하였다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
• /
• pp.1511-1516
• /
• 2009

In recent years, the large-scale shaft have been appling in domestic mine for mass production using a large machine, the safety of mine also have been increasing. And the new trial that shotcrete of tunnel field was apply to mine support was progressed. But, the conditions of domestic mine was different from that of tunnel, so, the batch plant of tunnel could not be installed in mine field because of low economical efficiency and difficulty for selection of site. Ready-mixed Shotcrete that mixed with high quality materials and could be controled shotcrete quality is producted in plants and transported to field, so do not need to batch plant. In this study, The Field test of the Ready-mixed Shotcrete was performed in the large-scale mine and was compared with the quality of Field mix shotcrete. As the result of the Field test, compressive strength and rebound of Ready-mixed Shotcrete were superior to these of Field mix shotcrete.

• International Journal of Concrete Structures and Materials
• /
• 제8권4호
• /
• pp.279-287
• /
• 2014

This paper presents the findings of an investigation of the fiber content variations in concrete being discharged from a ready-mix truck at the construction site. Concrete samples were extracted from the truck drums at the beginning, middle and end of discharge. Subsequently, fibers in each sample were separated from the concrete, and weighed. Presumably, synthetic macro fibers will float towards the top, i.e. towards the drum opening, of the inclined, revolving truck-drum, while, on the other hand, steel fibers will tend to gravitate towards the lower parts of the mixer drum. Accordingly, the discharge batch, containing synthetic macro fibers, will contain a higher amount of synthetic fibers per unit volume at the start of discharge than the average unit volume fiber content of the mix, and the content will gradually decrease further down the batch. The discharge batch of steel fiber concrete will contain fewer fibers per unit volume at the start of discharge than the average unit volume fiber content of the mix, and the content should gradually increase further down the batch. The correctness of the foregoing is partly confirmed. A certain percentage of the truck loads did not comply with the proposed requirements, mainly steel fiber reinforced batches, indicating the necessity of a code or guideline amendment. A change in the Norwegian shotcrete directive was made in 2011, based upon experimental research work (2010), which, in combination with the subsequent University of Life Sciences report (2012), constitutes the foundation of this article.

• Computers and Concrete
• /
• 제18권2호
• /
• pp.279-295
• /
• 2016

A new innovative composite material is textile reinforced cementitious composite (TRCC). To achieve high flexural performance researchers suggest polymer modification of TRCC matrices. In this study, nine ready mix repair mortars commonly used in construction industry and the production of TRCC elements were examined. Mechanical properties such as compressive and flexural strength, drying shrinkage were studied. Being a significant durability concern, alkali silica reaction tests were performed according to related standards. Results showed that, some ready repair mortar mixes are potentially reactive due to the alkali silica reaction. Two of the ready mortar mixes labelled as non-shrinkage in their technical data sheets showed the highest shrinkage. In this experiment, researchers designed new matrices. These matrices were fine grained concretes modified with polymer additives; latexes and redispersible powders. Two latexes and six redispersible powder polymers were used in the study. Mechanical properties of fine grained concretes such as compressive and flexural strengths were determined. Results showed that some of the fine grained concretes cast with redispersible powders had higher flexural strength than ready mix repair mortars at 28 days. Matrix composition has to be designed for a suitable consistency for planned production processes of TRCC and mechanical properties for load-carrying capacity.