• Title/Summary/Keyword: 경량 기포 콘크리트

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Characterization of Foamed Concrete Using Calcium sulfaluminate (칼슘설포알루미네이트를 활용한 기포콘크리트의 특성평가)

  • Cho, Yong-Kwang;Kim, Chun-Sik;Nam, Seong-Young;Cho, Sung-Hyun;Lee, Hyoung-Woo;Ahn, Ji-Whan
    • Journal of Energy Engineering
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    • v.28 no.1
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    • pp.10-16
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    • 2019
  • The purposes of this study is to secure subsidence stability and economical efficiency of lightweight foamed concrete. The composition of lightweight foamed concrete was designed for OPC by substituting with constant contents of calcium sulfaluminate and fly ash. It is found that the flow of lightweight foamed concrete decreased with early ettringite formation by CSA. The initial strength increased with the decrease of drying time of lightweight foamed concrete when CSA was substitution to 10%. The settlement deep of foamed concrete improved the settlement stability by replacing CSA, which prevented shortening of the coagulation time and bubble puffing.

An Experimental Study for the Strength Variations of High-strength Lightweight Concrete According to Grain-size of Artificial Lightweight Aggregate (인공경량골재의 입도에 따른 고강도 경량콘크리트의 강도변화에 대한 실험적 연구)

  • Kim, Sung Chil;Park, Ki Chan;Choi, Hyoung Wook
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.15 no.5
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    • pp.209-217
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    • 2011
  • In recent days, while taller and more massive structures such as huge bridges and super skyscrapers have been welcomed, the structural stabilization in design and construction have been gradually limited due to the major weakness of current concrete which is relatively heavier when compared with its strength. To improve the weakness of the current concrete, The lightweight concrete with light weight and high strength should be used; however, not many researchers in Korea have studied on the lightweight concrete. Generally, artificial lightweight aggregate produced through high-temperature-plasticization has a possibility of its body-expansion with many bubbles. Therefore, depending on the size of aggregate, the effects of bubbles on the specific weight and strength of the lightweight concrete should be studied. In this study, considering grain-size, the mix design of the artificial lightweight aggregate produced through the high-temperature-plasticization and the body-expansion of waste and clay from the fire power plant in Korea was conducted. The experiment to analyze the variation in specific weight and strength of the lightweight concrete was followed. From these experiments, the optimized grain-size ratio of the artificial lightweight aggregate for the enhancement of high-strength from the lightweight concrete was revealed.

Properties and Mock-up Test of Lightweight Foamed Concrete Based on Blast Furnace Slag by Crack Reducing Admixture (팽창성 균열저감제를 이용한 고로슬래그 미분말 기반 경량기포 콘크리트의 특성 및 목업실험)

  • Han, Sang-Yoon;Han, Min-Cheol
    • Journal of the Korea Institute of Building Construction
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    • v.17 no.6
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    • pp.507-515
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    • 2017
  • This study is to develop a high quality lightweight foamed concrete that can be applied in the field using EXFG by cracking reducing agent combined with FGD and ALS. First, to increase the volume of foam, the flow and density of the mixture was increased and decreased, respectively. At this time, the effect of substitution ratio of EXFG on fluidity was negligible. The fraction of foam was the highest at EXFG 1%, and the settlement was found to be prevented by the expansion reaction at EXFG 1%. At this time, the ratio of foam was 65%. In the compressive strength, the strengths were similar or decreased when the substitution ratio of EXFG was more than 1%. The apparent density satisfied the KS 0.5 type at the bubble contents was 65%. In case of EXFG substitution, dry shrinkage was decreased by about 10%. As the substitution ratio of EXFG increased, the thermal conductivity increased proportionally.

A Study on the Optimum Mixture of Sandwich Panel Core Using Lightweight Foamed Concrete (경량기포콘크리트를 이용한 샌드위치 패널 심재의 최적배합에 관한 연구)

  • Ahn, Jung-Hyun;Chun, Woo-Young;Lee, Sang-An;Kim, Wha-Jung
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.447-448
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    • 2009
  • On this study, the concrete foaming was maximized using Hydrogen peroxide($H_2O_2$) reciprocal decomposition catalyzed by Manganese dioxide($MnO_2$) and Sodium bicarbonate($NaHCO_3$). Also, we study the physical and mechanical properties of lightweight formed concrete through diverse experiment which is to determine the optimal mixing proportion and require strength of the lightweight formed concrete. As a result of an experiment, it is satisefied with overall quality standard on the KS F 4039 and KS F 2459 provision.

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Evaluation of Compressive Strength of Lightweight Aggregate Concrete using Bottom Ash Aggregates and Air Foam (기포가 혼입된 바텀애시 골재 경량 콘크리트의 압축강도 평가)

  • Lee, Kwang-Il;Yang, Keun-Hyeok
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.112-113
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    • 2018
  • The present feasible tests are to develop the lightweight concrete using bottom ash aggregates and performed air foam for applying to sustainable high-insulation panel. The main variables investigated are water-to-binder, foam volume ratio, and curing conditions. Test results showed that the lightweight concrete possessed the compressive strength of 5~9 MPa at the air dry density of 951~1,139 kg/m3.

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Physical Characteristics of ALC Controlled by Particle Size and Contents of Raw Materials (원료의 입도 및 함량제어에 따른 ALC의 물성 변화)

  • Jeong, Eui-Jong;Chu, Yong-Sik;Lee, Jong-Kyu;Song, Hun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.367-368
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    • 2009
  • High-rise building in modern society is becoming increasingly necessary to reduce the weight of the building. Accordingly, increased use of lightweight bubble concrete is a trend Porous ceramics (ALC) is the most common, lightweight bubble concrete. And it is by lightweight blocks the same used as building materials. This research is related to the physical characteristics of ALC controlled by particle size and contents of raw materials.

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Evaluation of Properties of Artificial Soil Aggregate Based on Ground Granulated Blast-Furnace Slag According to Unit Binder Content (단위결합재량에 따른 고로슬래그 기반 육성용 인공토양골재의 특성평가)

  • Mun, Ju-Hyun;Sim, Jae-Il;Yun, In-Gu
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.5
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    • pp.85-92
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    • 2016
  • The eight mixes and artificial soil aggregates were prepared for evaluating the practical application of lightweight foamed concrete as soil aggregates. The main parameter was unit binder content ranged between from 100 to $800kg/m^3$. In lightweight foamed concrete, flow, slurry and dried density, and compressive strength at different ages were measured. In Artificial soil aggregates crushed from lightweight foamed concrete, particle size distribution, pH, coefficient of permeability, cation exchange capacity(CEC), and ratio of carbon to nitrogen(ratio of C/N), were measured. The test results showed that flow, slurry and dried density, and compressive strength at different ages of lightweight foamed concrete increased with the increasing of unit binder content. Compressive strength at age of 28, of lightweight foamed concrete with unit binder of more than $500kg/m^3$, was more than 4 MPa. The ammonium phosphate immersion time of more than age of 3, was effective to decrease pH of artificial soil aggregates. In addition, artificial soil aggregates was evaluated as high class in terms of cation exchange capacity(CEC), while satisfied with value of ratio of carbon to nitrogen(ratio of C/N) recommended by landscape specification.