• Title/Summary/Keyword: mixing ratio of aggregate

Search Result 199, Processing Time 0.025 seconds

Fluidity and engineering properties of mortar mixed with bioinspired polymer according to mixing ratio of mixed slag fine aggregate. (혼합슬래그 잔골재 혼입율에 따른 생체모방 폴리머 혼입 모르타르의 유동성 및 공학적 특성)

  • Bae, Sung-Ho;Park, Sa-Min;Kim, Dae-Sung;Lee, Jae-In;Ko, Haye-Min;Choi, Se-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2022.04a
    • /
    • pp.259-260
    • /
    • 2022
  • In this study, as part of a study to solve the problem of aggregate supply and demand, blast furnace slag fine aggregate and ferronickel slag fine aggregate were used as substitutes for natural fine aggregate, and a bioinspired polymer, a catechol-functionalized chitosan, was used instead of the mixing water.

  • PDF

Strength Characteristics of Soil Concrete Using Jeju Volcaniclastic and Construction Techniques (제주도 석산 부산물인 화산토를 사용한 흙포장의 강도 및 시공 특성)

  • Hong, Chong-Hyun
    • Journal of Environmental Science International
    • /
    • v.20 no.1
    • /
    • pp.71-79
    • /
    • 2011
  • In this study, a series of soil concrete mixtures were tested for the compressive strength according to ratio of aggregate to binder, compaction energy, maximum aggregate size, ratio of silica fume to cement, and ratio of water to binder. The optimum mixing ratio of soil concrete mixtures composed of volcaniclastic, cement, silica fume, concrete polymer and water were analysed. The test results for optimum proportion were as follows ; (1)ratio of aggregate to binder was 4 : 1, (2)compaction energy level was level 2, (3)maximum aggregate size was 13 mm, (4)ratio of silica fume to cement was 10%, (5)ratio of water to binder was 25%. Also, dry type construction techniques were applied using the optimum soil concrete mixture. From the results of this study, the compressive strength of soil concrete and construction techniques were suitable for making eco-friendly soil pavement.

The Quality of artificial lightweight aggregates using waste PET bottles and Properties of their mortar (폐 PET병을 재활용한 인공경량골재의 품질 및 모르타르의 특성)

  • Choi, Yung-Wang;Lim, Hak-Sang;Chung, Jee-Seung;Choi, Wook;Hwang, Youn-Tae
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2002.05a
    • /
    • pp.631-636
    • /
    • 2002
  • This study shows basic data for using as the structural lightweight aggregate. This will be the procedural method of recycling environmental close waste PET bottle lightweight aggregate(PBLA) that is rapidly increased the amount of production of waste PET bottle recently, the quality of developed PBLA and the fundamental properties by analyzing of mortar containing with PBLA. After experiment, the result shows the PBLA quality that have oven dry specific gravity of 1.39, unit volume weight of 844 kg/m$^3$ and absorption rate of 0% is satisfied with qualify regulation of lightweight aggregate. The flowability of mortar containing PBLA is increased maximum 16% with increasing mixing ratio of PBLA, however the compressive strength of mortar is decreased maximum 35% with increasing mixing ratio of PBLA.

  • PDF

Engineering Characteristics of Resource-Cycling Mortar according to the Variation of Illite Replacement Ratio and Fine Aggregate Type (굵은골재 및 잔골재 조합변화가 초고강도 콘크리트의 기초적 특성에 미치는 영향)

  • Lee, Sun-Jae;Song, Yuan-Lou;Yun, Jeong-Wan;Han, Dong-Yeop;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2015.05a
    • /
    • pp.61-62
    • /
    • 2015
  • This study has analyzed the engineering characteristics of resource-cycling mortar according to the variation of fine aggregate type using illite with high development potentials by setting the goal as developing eco-friendly construction materials. As a result, while flow has increased if recycled fine aggregate and waste refractory are used separately or mixing them adequately in case of flow and compressive strength, the flow had somewhat declined followed by illite replacement. However, the possibility of such usage is determined to be adequate if used by mixing illite, recycled fine aggregate and waste refractory properly due to the dry shrinkage effect.

  • PDF

Fundamental Study on Optimum Mixing Proportion of Cement Concrete Pavement using Recycled Aggregate (순환골재를 활용한 포장용 시멘트콘크리트의 최적배합 도출을 위한 기초 연구)

  • Kim, Sueng Won;Kim, Yong Jae;Lee, Jang Yong;Lee, Hak Yong;Park, Cheol Woo
    • International Journal of Highway Engineering
    • /
    • v.18 no.6
    • /
    • pp.105-113
    • /
    • 2016
  • OBJECTIVES : This study is to develop the optimum mixing proportions for cement concrete pavement with using recycled aggregates. METHODS : The mixture varied recycled coarse aggregates content from 50 % to 100 % to replace the natural coarse aggregates by weight. Tests for fundamental properties as a cement concrete pavement were conducted before and after hardening of the concrete. RESULTS : It was found that the variation in the amount of the recycled aggregate affected the compressive and flexural strength development, as well as the chloride ion penetration resistance. As the amount of the recycled aggregate content increased the compressive and flexural strength and the resistance to chloride ion penetration decreased. However, the resistance to freeze-thaw reaction was affected significantly. In addition, the gradation of the aggregate became worse and hence so did the coarseness factor as the recycled aggregate amount increased. CONCLUSIONS : The fundamental properties of the concrete with recycled aggregate does not seem to be appropriate when the recycled aggregate quality is not guaranteed up to a some level and its replacement ratio is over 50%. The optimized gradation of the aggregates should also be sought when the recycled aggregate is used for the cement concrete pavement materials.

Characteristics on Shear Strength and Clogging Phenomenon of Bottom Ash and Rammed Aggregate Mixture Compaction Pile (쇄석과 저회의 혼합다짐말뚝의 전단강도와 Clogging 현상 규명)

  • Lee, Dongyeup;Kang, Hyongnam;Chun, Byungsik
    • Journal of the Korean GEO-environmental Society
    • /
    • v.11 no.3
    • /
    • pp.33-41
    • /
    • 2010
  • The rammed aggregate compaction pile method is widely used as soft ground improvement method because of the installed piles improve not only overall composite capacity but also discharge capacity. But the discharge capacity is declined when the clogging is generated due to the clay penetration into voids of rammed aggregate compaction pile with the time elapsed. The purpose of this study is to reduce the clogging problem occurred in rammed aggregate compaction pile constructed in the soft ground and to minimize voids of rammed aggregate compaction pile. The proper mixing ratio was determined which is based on the results of the large scale direct shear tests conducted to get strength and permeability as optimum mixing ratio of crushed stone and bottom ash. The test results indicated that the highest internal friction angle was obtained at 80:20 mixing ratio of crushed stone and bottom ash. The internal friction angle was declined when the mixing ratio of the bottom ash increased over 20%. The results of the clogging tests, presented that the mixture of 80:20 crushed stone and bottom ash is highest effective of clogging than ratio of pure crushed stone.

Characteristic of mixing rate of mud flat on Mortar in W/C 70% (W/C 70%인 모르타르에서의 갯벌 혼입률에 따른 특성)

  • Lee, Heung-Yeol;An, So-hyun;Yang, Seong-Hwan
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2016.10a
    • /
    • pp.30-31
    • /
    • 2016
  • Recently in the construction site is required various performance of mortar to deal with reliability, economy. Especially of environment-friendly, saving resources and high performance of mortar it began to require improvement of performance. Therefore, in this study, a series of tests was designed to develop a using mud flat mortar in view of the high absorption rate of tidal flats, to fix the water cement ratio to 70%. The mixing ratio were 10:0, 9:1, 8:2, 7:3, 6:4, 5:5, 4:6 of fine aggregate and mud flats. Compared the flow value, chloride content, compressive strength, tensile strength, and workability of fine aggregate the substituted mud flat mortar and basic cement mortar, present the basic data on the characteristics and effects of mud flat mortar.

  • PDF

Mix Design Procedure of Structural Concrete Using Artificial Lightweight Aggregates Produced from Bottom Ash and Dredged Soils (바텀애시 및 준설토 기반의 인공 경량골재를 활용한 구조용 콘크리트의 배합설계 절차)

  • Lee, Kyung-Ho;Yang, Keun-Hyeok
    • Journal of the Korea Institute of Building Construction
    • /
    • v.18 no.2
    • /
    • pp.133-140
    • /
    • 2018
  • The objective of this study is to propose a reliable mixing design procedure of concrete using artificial lightweight aggregate produced from expanded bottom ash and dredged soil. Based on test results obtained from 25 mixes, empirical equations to determine water-to-cement ratio, unit cement content, and replacement level of lightweight fine aggregates were formulated with regard to the targeted performance (compressive strength, dry density, initial slump, and air content) of lightweight aggregate concrete. From the proposed equations and absolute volume mixing concept, unit weight of each ingredient was calculated. The proposed mix design procedure limits the fine aggregate-to-total aggregate ratio by considering the replacement level of lightweight fine aggregates, different to previous approach for expanded fly ash and clay-based lightweight aggregate concrete. Thus, it is expected that the proposed procedure is effectively applied for determining the first trial mixing proportions for the designed requirements of concrete.

Analysis of Settlement Characteristics and Strength of Cement Mixing Ratio for a Backfill Material at a Railway Abutment (철도교대 뒤채움재료의 시멘트 혼합 비율에 따른 강도 및 침하특성 분석)

  • Yang, Sang-Beom;Choi, Chan-Yong;Kim, Nak-Kyung;Kim, Tae-Kyun
    • Journal of the Korean Geotechnical Society
    • /
    • v.32 no.9
    • /
    • pp.29-36
    • /
    • 2016
  • Backfill materials of rail abutment were commonly composed with cement treated aggregate, general aggregate and soil. The friction angle of cement treated aggregate increased up to $40^{\circ}$ or more due to strength enhancement. However, $30^{\circ}{\sim}35^{\circ}$ of friction angle was typically applied for in-situ condition. This phenomenon could cause over-designing, therefore, it is essential to determine reasonable material properties of cemented treated aggregate. In this study, a series of CBR tests and circular model tests have been conducted for cement treated aggregate, while changing cement mixing ratio. Based on test results, characteristics of settlement and strength have been analyzed quantitatively. The settlement of cement treated aggregate decreased with the number of cyclic loading and aging period. In addition, The strength increment ratio in CBR test increased up to 13~16 times at 28 days aging.

The Study on Sound Absorbing Characteristics of Porous Concrete according to Reverberation Room Methods (랜덤입사방법에 의한 포러스 콘크리트의 흡음특성에 관한 실험적 연구)

  • Seo Dae seuk;Park Seong Bum;Cho Gwang yeon;Jang Young Ill;Kim Hyung Seok;Lee yoon Sun
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2004.05a
    • /
    • pp.568-571
    • /
    • 2004
  • This research estimated the physical. mechanical characteristic and the character of sound absorption according to target void ratio of porous concrete and the mixing ratio of recycled aggregate for the valid utilization of recycled aggregate using waste concrete and sound reduction out of a road, a railway, a residential street, and a downtown area. As a result of the test, compressive strength tended to be a radical strength fall when target void ratio was $25\%$ and contents of recycled aggregate exceeded over $50\%$. Also, the character of sound absorption of porous concrete which used recycled aggregate using waste concrete was the most excellent when target void ratio was $25\%$, and the influence by contents of recycled aggregate was trivial. Therefore, when the strength and the character of sound absorption of porous concrete are considered, it is proved valid that proper target void ratio was $25\%$ and contents of recycled aggregate using waste concrete was $50\%$ or so.

  • PDF