• Computers and Concrete
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• 제10권2호
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• pp.95-104
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• 2012

This study uses recycled green building materials based on a Taiwan-made recycled mineral admixture (including fly ash, slag, glass sand and rubber powder) as replacements for fine aggregates in concrete and tests the properties of the resulting mixtures. Fine aggregate contents of 5% and 10% were replaced by waste LCD glass sand and waste tire rubber powder, respectively. According to ACI concrete-mixture design, the above materials were mixed into lightweight aggregate concrete at a constant water-to-binder ratio (W/B = 0.4). Hardening (mechanical), non-destructive and durability tests were then performed at curing ages of 7, 28, 56 and 91 days and the engineering properties were studied. The results of these experiments showed that, although they vary with the type of recycling green building material added, the slumps of these admixtures meet design requirements. Lightweight aggregate yields better hardened properties than normal-weight concrete, indicating that green building materials can be successfully applied in lightweight aggregate concrete, enabling an increase in the use of green building materials, the improved utilization of waste resources, and environmental protection. In addition to representing an important part of a "sustainable cycle of development", green building materials represent a beneficial reutilization of waste resources.

• 한국건설순환자원학회논문집
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• 제8권3호
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• pp.302-309
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• 2020

건설폐기물 중간처리시설에서 발생하고 있는 폐슬러지를 건조 분쇄한 순환 슬러지와 재활용되지 못하는 폐유리병을 가공처리한 순환 유리골재를 순환 상온아스팔트에 적용하기 위한 기초연구로서 순환 슬러지 및 순환 유리골재의 사용에 따른 순환 상온아스팔트의 특성을 비교·검토하였다. 그 결과 순환 슬러지를 채움재로서 사용량을 증가할수록 순환 상온아스팔트 혼합물의 마샬 안정도, 간접인강강도, 인장강도비는 감소하고 흐름값, 공극률은 증가하는 것으로 나타났다. 또한 순환 유리골재를 사용함으로서 순환 상온아스팔트 혼합물의 마샬 안정도, 간접인강강도, 인장강도비는 감소하고 흐름값, 공극률은 증가하는 것으로 나타났다.

• 한국구조물진단유지관리공학회 논문집
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• 제23권7호
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• pp.172-180
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• 2019

이 연구에서는 CRT 폐유리의 잔골재 대체율과 재료 물성(조성)을 달리한 모르타르의 미세구조와 감마선 차폐 효율을 평가하였다. 실험 결과에 따르면 CRT 폐유리의 잔골재 대체율이 증가할수록 50nm 크기 이하와 400nm 크기 이상의 공극 볼륨이 증가하였으며, 선헝감쇠계수는 상승하고 반가층은 작아지는 결과를 나타냈다. 또한, CRT 폐유리의 대체했을 때 강도는 감소하였으나 혼화재를 치환하여 OPC 이상의 강도값을 확보할 수 있었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표논문집(II)
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• pp.239-244
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• 1998

Fusion temperature of fly ash was determined with wasted glass wool and borax using ash fusion determinator, 0.5wt% of bentonite and water glass used as binder, 50wt% of wasted glass wool added to fly ash, fusion temperature of fly ash was 1, 156$^{\circ}C$. Pellet was prepared, and then sintered at 1, 00$0^{\circ}C$ and 1, 10$0^{\circ}C$. Water-absorption rate, specific gravity, porosity and pore structure of sintering aggregate was determined.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.155-156
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• 2017

Borosilicate glass was incorporated to improve the neutron shielding capability of concrete. Boron is a typical neutron shielding material, and it is contained in borosilicate glass. However, borosilicate glass causes alkali-silica reaction, which damages the concrete. Therefore, studied to reduce the expansion due to alkali-silica reaction and to improve the neuton shielding capability. The measurement of the expansion due to the alkali-silica reaction was based on ASTM C 1260. Experimental results show that the expansion due to alkali-silica reaction is reduced when borosilicate glass powder incorporated. In addition, the neutron shielding capability was significantly improved when the fine aggregate replaced with borosilicate glass.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.195-196
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• 2023

In this study, the mechanical properties, alkali-silica reaction(ASR) expansion and residual mechanical properties after ASR of waste glass fine aggregate(GS) mortar according to mineral mixture were evaluated. As a result, it was found that the mineral mixture reduces the ASR expansion. However, mechanical properties and residual mechanical properties have decreased.

• 한국건설순환자원학회논문집
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• 제3권4호
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• pp.374-381
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• 2015

화재에 대한 건축물의 내화성능 확보를 위해서는 온도가 상승하더라도 허용범위 이내로 제어하고 탈락이나 손상 등이 발생하지 않아야 한다. 이에 대한 대책으로 부재 외면에 내화모르타르로 마감을 하는 것이 가장 효율적인 방법이다. 내화 마감모르타르는 고온에서 강도변화가 작고 열적으로 안정하며 열전도율이 낮은 경량재료라면 효과적으로 성능발현이 가능할 것이다. 본 연구는 내화 마감모르타르 개발을 위한 연구로 비교적 내화성능이 우수한 플라이애시 및 메타카올린 기반의 알칼리 활성화 결합재와 펄라이트 및 유리 발포 경량골재의 고온 특성에 대해 검토하였다. 실험결과 열전도율이 낮고 고온에서 비교적 안정적인 특성을 발현하여 내화 마감모르타르로 적용이 가능할 것으로 판단된다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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• pp.533-536
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• 2006

A light-weight aggregate with a surface layer was fabricated using glass abrasive sludge and expanding agents. The glass abrasive sludges were mixed with expanding agents ($Fe_2O_3,\;graphite,\;CaCO_3$) and formed into precursors. These precursors were sintered in the range of $700-900^{\circ}C$ for 20min. The sintered light-weight aggregate had a surface layer with smaller pores and an inner region with larger pores. The surface layer and pores controlled the water absorption ratio and physical properties. As the expanding agent fraction and the sintering temperature increased, the porosity and pore size increased. The light-weight aggregate with $Fe_2O_3$ and graphite as the expanding agents had a low water absorption ratio while the porous material with $CaCO_3$ as the expanding agent had a higher water absorption ratio and more open pores.

• 한국세라믹학회지
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• 제47권5호
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• pp.365-372
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• 2010

This paper was to evaluate the influence of kiln process parameter(kiln angle, kiln rotating speed) of lightweight aggregate using waste glass and bottom ash with industrial by-products on thermal conductivity, density, water absorption, fracture load and porosity by response surface analysis. In the results of surface plot and contour plot, it has verified that kiln residence time of lightweight aggregate increase as kiln angle and rotating speed decreases. For this reason, pore size and quantity tend to increase by active reaction of forming agent. It seems to be that increase in pore size and quantity have caused decreasing density, fracture load and thermal conductivity, and increasing water absorption. In conclusion, optimization of kiln process parameter on thermal conductivity, density, water absorption, fracture load and porosity by response surface analysis are kiln angle 2.4646%, kiln rotating speed 40.7089 rpm.

• Steel and Composite Structures
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• 제44권3호
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• pp.389-406
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• 2022

Recycling concrete construction waste is an encouraging step toward green and sustainable building. A lot of research has been done on recycled aggregate concretes (RACs), but not nearly as much has been done on concrete made with recycled aggregate. Recycled aggregate concrete, on the other hand, has been found to have a lower mechanical productivity compared to conventional one. Accurately estimating the mechanical behavior of the concrete samples is a most important scientific topic in civil, structural, and construction engineering. This may prevent the need for excess time and effort and lead to economic considerations because experimental studies are often time-consuming, costly, and troublous. This study presents a comprehensive data-mining-based model for predicting the splitting tensile strength of recycled aggregate concrete modified with glass fiber and silica fume. For this purpose, first, 168 splitting tensile strength tests under different conditions have been performed in the laboratory, then based on the different conditions of each experiment, some variables are considered as input parameters to predict the splitting tensile strength. Then, three hybrid models as GWO-RF, GWO-MLP, and GWO-SVR, were utilized for this purpose. The results showed that all developed GWO-based hybrid predicting models have good agreement with measured experimental results. Significantly, the GWO-RF model has the best accuracy based on the model performance assessment criteria for training and testing data.