This research was performed to evaluate applicability of cold-mix recycling asphalt concrete, which was modified during recycling process. A maximum size of 25mm reclaimed asphalt pavement(RAP) was used in cold-recycle process together with an asphalt emulsion and recycled inorganic binder as a binder.

The purpose of this study is to investigate the characteristics of compressive strength and workability according to the NaOH and KOH addition method as powder of mortar which is made of Non-sintered binder for the reuse of resources and the CO2 reduction

Domestic portland cement(OPC) is made up of clinker, gypsum and 5% of admixtures. If 5% of Admixture contents of portland cement add to 10%, CO2 reduction effect can be expected. In this study, Freezing and Thawing test of concrete using limestone powder was evaluated.

The purpose of this study is to analyse the hydration reaction of paste according to fineness of non-cement binder, as a basic for the development of non-cement concrete block. As the fineness of binder increased, compressive strength of paste increased, and C-S-H gel was produced actively.

The objective of this study is to investigated the compressive characteristics properties used cement paste containing Silica Fume Binder with elapsed curing time.

The objective of this study is to investigated the compressive characteristics properties used cement paste containing 30% blast furnace slag with curing days.

The objective of this study is to investigated the compressive characteristics properties used cement paste containing 20% fly ash with curing days.

This study investigates the fundamental properties of the water-binder (W/B) ratio and fine aggregate-binder (F/B) ratio in the alkali-activated slag cement (AASC) mortar. The W/B ratios are 0.35, 0.40, 0.45, and 0.50, respectively. And then the F/B ratios varied between 1.00 and 3.00 at a constant increment of 0.25. The alkali activator was an 2M and 4M NaOH. The measured mechanical properties were compared, flow, compressive strength, absorption, ultra sonic velocity, and dry shrinkage. The flow, compressive strength, absorption, ultra sonic velocity and dry shrinkage decreased with increases W/B ratio. The compressive strength decreases with increase F/B ratio at same W/B ratio. Also, at certain value of F/B ratio significant increase in strength is observed. And S2 (river sand 2) had lower physical properties than S1 (river sand 1) due to the fineness modulus. The results of experiments indicated that the mechanical properties of AASC depended on the W/B ratio and F/B ratio. The optimum range for W/B ratios and F/B ratios of AASC is suggested that the F/B ratios by 1.75~2.50 at each W/B ratios. Moreover, the W/(B+F) ratios between 0.13 and 0.14 had a beneficial effect on the design of AASC mortar.

The aim of this study was to evaluate various methods for producing high-quality fuel pellets using rape stalk (RS), which is an agricultural waste. RS was used as a raw material for pellets production after three treatments [distilled water (DW), sulfuric acid (AC), sodium hydroxide (AK) solutions]. Then, fabricated pellets with two binder additions [ rapeseed flour (RF), coffee waste (CW)] were examined to evaluate their fuel qualities. Results showed that binder additions (RF, CW) improve the durability and higher heating value for RS-based pellets. The addition of CW greatly decreased ash content for fabricated pellets. Also, all immersion treatments improved all fuel qualities compared to non-immersed treatment. Particularly, DW-immersion had favorable influences on the increases of higher heating value and durability. Two immersion treatments (AC, AK solution) positively influenced the improvements of bulk density and ash content for fabricated pellets. However, they were required to rinse the residue existed on the RS, and consequently the use of DW-immersion might be the most beneficial way to improve the qualities of RS-based pellets. All qualities of the pellets were acceptable for the European agropellet standards (A- or B-grade). Hence, RS can be used as a raw material for the production of agropellets while outdoor exposure of RS or mixing RS with CW or wood sawdust might be help to better agropellets qualities.

There are great and comprehensive efforts to reduce green house gases, especially carbon dioxide, in a global community of nations. Carbon dioxide emissions of South Korea placed ninth in the world in 2007, 13 percent of that is a field of construction materials. Domestic portland cement(OPC) is made up of clinker, gypsum and 5% of admixtures. If 5% of Admixture contents of portland cement add to 10%, CO2 reduction effect can be expected. In this study, the strength properties of mortar using two types of cement were evaluated.

This study was performed an evaluation of physical & mechanical properties of mortar by Non-Sintered binder of ball milling time according to fineness.

This study examines the strength development of non cement binder using blast furnace slag, which is generated as a by-product in the manufacturing the irons. In the experiment, we used KOH, Ca(OH)2 as the blast furnace slag stimulus. As the results of this experiments, it was shown that the compressive strength increased when mixing ratio of KOH and Ca(OH)2 was increased.

As a fundamental analysis, this study measured and examined the mechanical property and chemical attack resistance of ceramic binder repair material at a development step through continued research. The study showed the compressive strength and bond strength of the repair material meet the standard; however, bending strength of it failed to meet the required standard. Meanwhile, chemical attack resistance displayed the excellent result.

This research was performed to evaluate physical properties of polysulfide epoxy overlay material for bridge deck, as part of a review for possibility of domestic of epoxy polymer concrete binder for thin bridge deck pavements. After mix test, carry out experiment such as harden, viscosity, tensile, compressive strength and Ultraviolet ray test for evaluate strength and durability characteristics. The tests showed that the results, met the criteria suggested by the ACI in hardness, viscosity, tensile strength and compressive strength. Furthemore, a comparsion of the in this study and goods of Transpo.co in USA, this study were excellent.

최근 도로 파손 발생 이전에 유지관리 차원에서 최소 비용으로 최대 효과를 볼 수 있는 예방적 유지보수공법에 대한 관심이 증가하고 있다. 예방적 유지보수공법 중에서 많이 사용되는 것이 표면처리공법으로 유화 아스팔트 바인더 또는 개질 유화 아스팔트 바인더가 사용되고 있다. 일반적으로 유화 아스팔트 바인더는 상온 시공이 가능하지만 공용 수명이 짧은 단점이 있다. 따라서 본 연구에서는 유화 아스팔트 계열 바인더의 단점을 보완하기 위하여 우레탄으로 개질된 아스팔트 바인더를 개발하고자 하며, 우레탄 개질 아스팔트 바인더 주재에 대한 저장 안정성 및 점도 실험을 수행하였다. 실험 결과 프로세스 오일의 양은 아스팔트 바인더 혼합물 중량에 대하여 30% 이상 필요한 것으로 나타났다. 아로마계, 나프탄계 및 파라핀계의 프로세스 오일을 혼합한 아스팔트 바인더 혼합물과 이소시아네이트를 혼합 할 경우 재료 분리가 발생했다. 재료 분리가 발생하지 않은 주재에 대한 점도 시험 결과 TDI(Toluene Diisocyanate)를 첨가하여 주재를 생산하는 것이 MDI(Diphrnyl Methane Diisocyanate)를 첨가한 경우보다 점도 기준을 만족시키는데 유리한 것으로 나타났다.

본 연구에서는 콘크리트 배합과 혼화재 첨가에 의한 콘크리트 물성 변화가 매립 철근의 부식을 평가하는 전기-화학적 기법에 미치는 영향을 확인하고 그 원인을 분석하였다. 연구 결과 자연전위법은 철근의 부식면적이 10% 이하일 경우 콘크리트 내부 물성에 영향을 받는 것으로 나타났으며, 혼화재가 혼입된 경우에는 높은 부식상태의 철근에 대한 정성적인 부식평가가 가능하였다. 또한 분극저항법은 부식량이 10% 이하로 미미한 경우에도 콘크리트 물성의 영향을 받지 않았으나, 혼화재가 혼입된 경우에는 비슷한 철근부식면적의 OPC보다 부식정도를 과소평가하는 것으로 나타났다.

현재 기존의 아날로그 형태의 필름/스크린 방식은 영상 저장 및 전송 등의 문제점이 대두되면서, X선에 반응 하여 전하 캐리어를 생성시키는 광도전체 물질을 사용하는 직접 방식의 디지털 방사선 검출기로의 연구가 활 발히 이루어지고 있다. 본 논문에서는 광도전체 물질인 Lead Oxide와 기존에 많이 연구가 진행 되었던 Lead (Ⅱ) Oxide를 PIB(Particle In Binder) 방식으로 각각 제작하여 그 전기적 특성을 비교 평가하고자 하였다. 기 존의 논문 중 물질의 입체각에 관한 논문에 따르면 정방계의 물질이 사방정계의 물질보다 좋은 특성을 보인다 는 것을 기반으로 하여 PbO가 정방계의 α-PbO와 사방정계의 β-PbO를 비교하였다c. 정방계의 α-PbO와 β -PbO를 PVB(Poly Vinyl Butyral)를 이용한 바인더를 사용하여 PIB(Particle In Binder) 방법으로 제조된 각 시편의 민감도(X-ray sensitivity), 누설전류(Leakage current) 및 SNR(Signal to Noise Rate)와 같은 전기적 특성을 실험을 통해 확인 비교한 것이다. 그리고 시편의 물리적인 특성을 보기 위한 기본적인 SEM(Scanning Electron Microscope) 사진을 촬영하였다. 본 논문에서는 완벽한 α-PbO를 제작하지 못하였으므로 차후 물질 을 제작하는 것에 대한 연구가 더 필요할 것으로 사료된다.

Generally, a silicone rubber and a chlorinated polyethylene(CPE) have been used as a binder for the development of high-performance composite EM(Electro Magnetic) wave absorbers. In this paper, the EM wave absorption performance of natural lacquer, which is newly proposed as a binder was investigated. The prepared MnZn ferrite EM wave absorbers are mixed with natural lacquer showed excellent EM wave absorption characteristics compared with MnZn ferrite EM wave absorbers which are mixed with the conventional binders. MnZn ferrite EM wave absorbers mixed with natural lacquer were prepared and their absorption ability was also investigated The EM wave absorbers are fabricated in different proportions of MnZn, or NiZn ferrite and natural lacquer, and their reflection coefficients are measured. The permittivity and permeability are calculated by using the measured reflection coefficients. The EM wave absorption abilities are calculated according to different thicknesses of the EM wave absorbers.

고성능 복합형 전자파 흡수체를 개발하기 위해 종래에는 지지재로서 주로 Silicone 고무나 CPE(Chloride Polyethylene)가 사용되어 왔다. 본 연구에서는 전통 공예에서 사용되어 오던 옻에 대한 특징을 분석하고 옻의 전자파 흡수능을 실험을 통하여 평가하였다. 또한, 옻을 지지재로 사용하여 MnZn 페라이트와 배합하여 전자파 흡수체를 제작한 경우의 전자파 흡수능 및 흡수체의 두께에 따른 흡수능을 실험적으로 평가하였다. 옻을 지지재로 한 MnZn 페라이트 복합형 전자파 흡수체는 CPE나 Silicone 고무를 지지재로 한 전자파 흡수체에 비하여 우수한 전파흡수특성 나타내었으며, 옻을 지지재로 사용한 전자파흡수체의 두께 변화에 따라 정합주파수와 전파흡수능이 변화하는 것으로 나타났다.