Even though cement a major foundational ingredient in modern architecture, it is known to destroy the environment due to its high energy consumption and how its production releases large amounts of carbon dioxide. To address this situation, the cement industry has proceeded to study how to reduce the amount of CO2 released and has recently started developing unused non-sintered cement. Inaddition, studies are in active development for cement that has not gone through the burning process. If it is possible to make cement using blast furnace slag and industry outgrowth without the use of clinker, it can be expected to help when running out of limestone and to mitigate the pollution problem through CO2 emissions. This study apprehended the measurement of kinematical characteristics through measuring polymer nonsintered cement flexural and compressive strength and analyzing the pH · Cl− Penetration Depth characteristic, through the SEM test also analyzes the reaction of the hydration mechanism, the result of decrementing the water/cement ratio, and entrained air contents from the mixing of polymer, and conducts that durability test for the absorption rate and carbonation experiments. The results of experimentation show excellent chemical and mechanical properties compared to ordinary Portland cement.

In this study, Early compressive strength analysis of low carbon mortar using industrial byproducts and describes relationships between strength property and CO2 indices to evaluate eco-efficient of low carbon binder mortar. Based on the results, this study is to give fundamental data for ability of eco-efficient low carbon binder.

The flowability and compressive strength were evaluated to examine the effect of biner mixing ratio on the high-fluidity concrete with low binders. When the binder mixing ratio (OPC, BFS, FA) was 7:2:1, It was most suited for high-fluidity concrete with low binders by increasing workability and compressive strength.

In this study, Early compressive strength analysis of low carbon mortar using industrial byproducts and describes relationships between strength property and CO2 indices to evaluate eco-efficient of low carbon binder mortar. Based on the results, this study is to give fundamental data for ability of eco-efficient low carbon binder.

The flowability and compressive strength were evaluated to examine the effect of biner mixing ratio on the high-fluidity concrete with low binders. When the binder mixing ratio (OPC, BFS, FA) was 7:2:1, It was most suited for high-fluidity concrete with low binders by increasing workability and compressive strength.

In this study, CO2 reduction type quaternary component high fluidity concrete was produced with more than 80%r eduction in cement quantity to increase the use of industrial by product sand enhance construction performance, there by reducing CO2 emissions. Furthermore, theq uality properties, and CO2 reduction performance of this concrete were evaluated. As a result of the quality evaluation of quaternary component blended high fluidity concrete with CO₂reduction, the target performance could be achieved with a 80% or more reduction of cement quantity by mixing a large amount of industrial byproducts. The required performance level was obtained even though the flow, mechanics, and durability characteristics decreased a little compared to conventional mix.

The purpose of this current study was to evaluate direct tensile properties of engineered cemetitious composite(ECC)1) according to the volume fraction of the non-sintered binder. From the test result, the higher volume fraction of the non-sintered binder, the tensile strength was decreased but the maximum strain was increased.

본 연구에서는 경량기포 콘크리트를 이용한 육성용 토양골재의 적용성을 평가하기 위해서 고로슬래그 기반 기포콘크리트의 총 8 배합과 인공토양골재를 제조하였다. 고로슬래그 기반 기포콘크리트 배합의 주요변수는 단위결합재량으로서 100에서 800 kg/m3으로 변화하 였다. 경량기포콘크리트는 플로우, 슬러리 및 절건 밀도와 재령별 압축강도를 측정하였으며, 파쇄된 인공토양골재는 pH, 입도분포, 투수계수, 양이온치환용량(CEC), 유기물함유량(C/N비)을 측정하였다. 측정결과 경량기포콘크리트의 플로우, 슬러리 및 절건밀도와 재령별 압축강도는 단위결합재량이 증가함에 따라 증가하였다. 경량기포콘크리트의 단위결합재량이 500 kg/m3 이상인 배합의 28일 압축강도는 4 MPa 이상이었 다. 인공토양골재에 3일 이상의 15% 희석된 제1인산암모늄의 수용액침지는 pH를 저감시키는데 효과적이었다. 또한 제조된 인공토양골재는 양이온 치환용량(CEC) 측면에서 상급으로 평가되었지만 C/N비 측면에서는 조경시방서를 만족시키지 못하였다.

This paper presents an investigation of the mechanical properties on alkali-activated binders immersed in sea water. The alkali-activated binders were synthesized using blended binder(Class F fly ash; FA and ground granulated blast furnace slag; GGBFS) and alkali activator(sodium hydroxide and sodium silicate). Binders were prepared by mixing the FA and GGBFS in different blend ratios of 6:4, 7:3 and 8:2. The alkali activators were used 5wt% of blended binder, respectively. Calcium carbonate was used as an chemical additive. The compressive strength and absorptiion were measured at the age of 3, 7 and 28 days, and the XRD and SEM tests were performed at the age of 28 days.

This study reviewed sulfuric acid resistance of high acid resistance of inorganic binder based on industrial by-products. As the results of test, the mix of high acid resistance of inorganic binder showed the excellent chemical resistance against aqueous solution of 10% H2SO4 comparing to the mix of OPC, however, the mass of inorganic binder rather increased while approximately 3.4% of mass loss ratio appeared during 7 days of material age of soaking in case of using portland cement usually.

In the cement industry, a large amount of CO2 is emitted from the first production step, and moreover the most of secondary products go through a variety of curing processes in which fossil fuels are used, causing additional CO2 emissions. Thus there is need for developing technology so that the secondary cement products are to be processed with no or less frequent curing in the manufacturing stage, helping not only reduce CO2 emissions but also improve the economical efficiency. Thus, this study seeks to make a comparative analysis of the engineering characteristics of extruded panels which are manufactured using CSA, calcined kaolins and CAMC inorganic binder, and those of traditional extruded cement panels, and then to use the results as basic data for developing LEC extruded panels. The experiment results showed that unit weight and density of extruded panels were similar to those of the traditional mix of ordinary Portland cement, and that the ratios of the former’s water content and water absorption were 2~3% higher than those of the latter. On a material age basis of 28 days, the compressive strength was shown to be about 4.5 N/mm² more with 64.6 N/mm² for the 35 mm thickness, and 24.9 N/mm² more with 84.2 N/mm² for thr 50mm thickness, while the flexural strength was shown to be 2.4 N/mm² less with 14.1 N/mm² for the 35 mm thickness and 1 N/mm² less with 13.9 N/mm² for the 50 mm thickness compared to the traditional mix. These conflicting results in the cases of the compressive and flexural strength are though to have been due to the fact that the LEC binder had caused the greater volume expansion of the hydration products resulting from the hydration of the binder under the closely-knit structures thanks to the vacuum extrusion, necessitating future observation of the length changes and the fine structure. In addition, there were some cases where the 35 mm thickness had 1.0 N/mm² more than the 50mm thickness depending on the thickness of the panel. This is thought to be due to the difference in the hydration ratios incurred by the different caloric values per unit area depending on the thickness of the panel when going through a short period of curing process.

This study investigate mechanical properties of alkali-activated slag fiber-composites according to water to binder ratio. A series of experiments were carried out to find the mechanical properties including compressive strength, uniaxial tensile tests. The result of tests exhibited strain hardening behavior and high ductility under direct uniaxial tensile load test.

CO2 emitted from building materials and construction materials industry reaches about 67 million tons, which occupy about 30% of CO2 emitted from the construction field. Controls on the use of consumed fossil fuels and reduction of emission gases are essential for the reduction of CO2 in the construction area as we reduce the second and third curing to emit CO2 in the construction materials industry. Accordingly, this study applied the low energy curing admixture (hereinafter “LA”) to the extruded panels to observe the physical properties, depending on the mixing amount of fiber, type of fiber and mixing ratio of fiber. The type of fiber did not appear to be a main factor to affect strength, while the LA mixing ratio and mixing amount of fiber appeared to be major factors to affect strength. Especially, the highest strength was developed when the LA mixing ratio was 40%, whereas the test object with the mixing ratio of 50% resulted in the decrease of strength. In addition, it appeared that the mixing ratio of fiber greatly affected flexural strength and strength increased as the mixing ratio increased.

석조문화재 보수물질로서의 적용을 위해 무기질 바인더를 시험하였다. 순수 무기질 바인더와 첨가제를 배합한 3종을 시편으로 제작하였고 거창화강석에 무기질 바인더 시편들을 부착시켜 무기질 바인더가 암석에 미치는 영향을 분석하였다. 무기질 바인더와 반응시킬 pH 4.0과 pH 5.6 수용액을 국내 강우의 산성도와 함유이온을 토대로 제조하였다. pH 8.0 약알칼리수와 pH 6.85 탈이온수를 준비하여 산성수의 대조군으로 적용하였다. 물반응 후 무기질 바인더 시편의 무게 감소는 시편의 종류에 따라서는 컸지만 물의 산성도와 상관성은 적었다. 순수 무기질 시편의 압축강도가 가장 컸으나 물반응 후 감소율이 가장 크다. 큰 흡수율은(6.72-12.44kg/m2˙t1/2) 무기질 바인더로부터 용출된 이온 함량과 상관성이 크다. 모든 액성의 수용액이 무기질 바인더와 반응 후 pH 9.0-10.0로 변화하였으며, 수용액에서는 무기질 바인더에서 용해된 Mg2+와 K+이 다량 검출되었다. 용해된 이온들은 수용액 내 음이온들과 결합하여 높은 용해도를 지닌 MgSO4˙nH2O 및 KNO3와 같은 백색염을 형성하였다. 암석강화제와 발수제를 처리한 무기질 바인더 시편에서는 이온량이 급격하게 감소하였다.

Semi-rigid pavement is one of excellent paving methods adopting merits of asphalt-concrete and concrete paving. However, conventional paving methods were mainly used on the new constructed roads. Therefore, in this research we have examined the possibility of using the semi-rigid pavement on occupied roads. Also, confirmed the early-open possibility of pavement by applying the rapid hardening binding material to semi-rigid pavement.

There are comprehensive efforts to reduce CO2 gases and CO2 reduction can be expected using a limestone powder as a admixture in concrete. In this study, Drying shringkage of concrete using a large amount of limestone powder was evaluated.

Recently, the trend toward larger structures continues and accelerates demand for ultra-high-strength concrete (UHSC) which satisfies structural performance. Most of researchers study on the method to increase the strength of ultra-high-strength concrete for the demand of construction market. For the application, however, ultra-high-strength concrete was needed lots of experimental study from material properties and mechanical properties to evaluate structural behavior. Currently, the design standard for concrete shrinkage and creep is limited to a range of 20 MPa to 70 MPa. It should be compensate the previous design standard to using for ultra-high-strength concrete. the ultra-high-strength concrete is appeared large autogenous shrinkage and crack may be occurred in less shrinkage once water to binder ratio is small and unit binder is large. The ultra-high-strength concrete is subjected to critical influence on micro-cracking owing to the small porosity. It should be considered the long-term behavior likely shrinkage and creep while the architectural buildings and long-span bridges are designed. In this study, therefore, the long-term behavior of ultra-high-strength concrete was investigated the parameters of water to cement ratio.

The purpose of this study is to investigate the field application of cold-mixed recycled asphalt using cementless binder. After the test construction, it was not cause problem, such as this stripping, falling and crack of pavement. Also, it was confirmed to be performance of equal or higher than of existing technology.

The purpose of this experimental study is to investigate the influence of chemical resistance of concrete using KOH and Non-sintered binder. As a result, concrete using KOH and Non-sintered binder was confirmed to be superior than ordinary of concrete chemical resistance.

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.