Phase change material (PCM) has been developed and applied in various fields as construction material. If the application of PCM as the semi-rigid pavement cement grout becomes available, it would be possible to control the occurrence of a micro crack due to the generation of hydration heat in the ultra rapid harding cement, and if the occurrence of a micro crack is reduced, it would be possible to improve the cohesion performance between asphalt matrix and grout as well as to compact the matrix of the pavement material, improving the durability. Therefore, the applicability review of PCM for the purpose of improving the semi-rigid pavement materials through the shrink reduction of ultra rapid harding cement used as the semi-rigid pavement cement grout was carried out in this study.

Phase change material (PCM) has been developed and applied in various fields as construction material. If the application of PCM as the semi-rigid pavement cement grout becomes available, it would be possible to control the occurrence of a micro crack due to the generation of hydration heat in the ultra rapid harding cement, and if the occurrence of a micro crack is reduced, it would be possible to improve the cohesion performance between asphalt matrix and grout as well as to compact the matrix of the pavement material, improving the durability. Therefore, the applicability review of PCM for the purpose of improving the semi-rigid pavement materials through the shrink reduction of ultra rapid harding cement used as the semi-rigid pavement cement grout was carried out in this

A study to apply phase change material(PCM) to rapid hardening cement paste forming semi-rigid pavement was carried out. The characteristics fresh and hardened paste were evaluated through the experiment for a total of 6 mixtures according to the cement type and the substitution of phase change material for acrylate. The fluidity by substituting phase change material for acrylate satisfied the target flow time of 10 to 13 seconds. In case of setting time, it was possible to secure the performance of rapid hardening cement by substituting phase change material, and if the substitution ratio over 60%, the initial set occurred 1 to 2 minutes faster than other mixtures. In case of compressive strength and bond strength, it showed similar strength characteristics with the plain mixture, and it satisfied both the target compressive and bonding strength of 36MPa and 2MPa. The mixture substituting phase change material showed higher resistance to chloride ion penetration than the mixture only using acrylate and the OPC level was insufficient. From the results of physical and mechanical performances of semi-rigid pavement cement paste, the phase change material substitution rate of 20% was effective in the range of this study.

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.

본 연구에서는 유황폴리머에멀젼 (SPE)을 반강성 포장용 주입재의 아크릴레이트 대체재로서 활용가능성과 성능향상재료 (PVA섬유)에 대한 역학적 성능과 내구성능을 평가하였다. 평가결과, 반강성 포장재의 충전률은 섬유의 혼입률이 증가함에 따라 충전률이 저하되었지만,모든 배합조건에서 평균 92~94%로 측정되어 목표 성능인 90%를 만족하였다. 반강성 포장재의 마샬안정도 값은 최대 25.4kN으로 측정되어 반강성 포장재의 국내 기준인 5.0 kN 보다 약 4.7배 우수한 것으로 나타났다. 반강성 포장재의 동적안정도 평가결과, 휠 트래킹시험에 따른 변형저항성은 SPE를 대체한 배합조건이 보다 우수하였고, 모든 배합조건에서 45분 이후에는 변형량이 일정한 값에 수렴되어 동적안정도가 31,500회/mm로 동일한 결과를 나타내었다. 파단변형률은 최대 0.53% 정도로 나타나 아스팔트 포장재보다 우수한 강성으로 나타났다. 마모저항성 및 충격저항성 검토결과 모든 배합조건에서 손실률이 9.8~6.0%로 나타나 우수한 내마모성을 나타내었으며, 섬유를 0.3% 혼입한 경우 혼입하지 않은 Plain에 비하여 2.82배의 내충격성 향상을 나타내었다. 역학적성능 및 내구성능 등을 모두 고려하여 볼 때, 이연구 범위에서는 SPE 대체율 30%가 적정 수준이고, 혼입률 0.3% 범위에서 PVA 섬유를 적용하면 우수한 인성을 갖는 반강성 포장재 제조가 가능 할 것으로 판단된다.

반강성 포장공법은 콘크리트포장의 강성과 아스팔트포장의 연성을 동시에 만족시킬 수 있도록 개발된 포장공법으로 국내외에서 기술개발 및 현장적용이 활발히 이루어지고 있다. 반강성 포장공법은 포장 후 빠른 교통개방을 위하여 초속경 시멘트를 사용하여 주입재를 제조하는데 이때, 초속경 시멘트의 급결성 때문에 경화시 수화열로 인한 균열이 발생되는 문제점을 가지고 있다. 또한, 주입재의 유동성능 확보와 균열 저감을 목적으로 아크릴레이트 사용시 경제성이 낮은 단점을 가진다. 이에 대한 방안으로서, 수화열저감을 위하여 PCM(Pease change material)을 사용하고, 연간 120만톤 이상 부산되어 다량 폐기되는 유황을 에멀젼화하여 아크릴레이트의 대체재로서 사용 가능성을 검증하기 위한 기초연구를 수행하였다. PCM 및 SPE를 혼합한 반강성 포장용 시멘트 주입재의 압축강도 측정은 KS L ISO 679에 준하여 시험체를 제작하여 측정하였다. 배합조건은 W/B=40%, PCM 혼입률을 시멘트 질량의 0, 0.2, 0.5%로 첨가하고, SPE는 아크릴 대체률 0, 15, 30%로 하였다. 평가 결과, PCM의 혼입률에 따른 강도특성은 혼합하지 않은 Plain에 비하여 0.2%에서는 재령에 따라 유사한 강도특성을 나타내었지만, 0.5% 혼입시 약 8 ~ 13%의 강도저하가 발생되었다. 아크릴레이트에 대한 SPE의 대체율에 따른 강도특성은 초기 재령에서 혼입률의 증가에 따라 강도가 미소하지만 감소되는 것으로 나타났다. 본 연구에서 검토한 결과, PCM 및 SPE의 반강성 포장용 주입재에 대한 혼화재 및 대체재로서 사용가능성을 확인하였으며, 추후 수화열 저감성능 확인 및 내구성능 등의 검토가 이루어져야 할 것으로 사료된다.

In this study, application of industrial by-products as an ultra rapid hardening cement substitute for semi-rigid pavement grout was evaluated. The examination of abrasion resistance showed that the loss ratio was 8.0~11.5% in every mixing condition, which indicates a good abrasion resistance.

the desulphurization process. To exploit this abundance, the applications of sulphur must be expanded. as excellent durability of reuse of leftover sulphur which has high potential for utilization in construction materials, the study is actively in progress. Meanwhile, there has been active research on semi-rigid pavements that draw on the strengths and overcome the weaknesses of asphalt and concrete pavements. Acrylate is used to prevent cracking but involves a high cost, thus, an alternative material is required. As such, this study presents methods on the reuse of leftover sulphur and examines the engineering performance of grout containing sulfur polymer emulsion (SPE) for use in semi-rigid pavements. Our analysis shows that grout in which 30% of acrylate is replaced with SPE has superior properties in terms of time of flow and strength compared to regular grout. However, performance declined when more than 50% of acrylate was replaced by SPE, indicating that the optimum replacement level is 30%. Through SEM analysis, we found that grout with utra harding cement in this study at three hours had similar hydration properties to that of Type 1 Ordinary Portland Cement (OPC) at seven days, and maintained the properties regardless of grout containing SPE. OPC and grout with a replacement level of 30% displayed similar levels of chloride invasion resistance, whereas grout without SPE was far less resistant. Within the scope of this paper, the optimum replacement level of acrylate with SPE was found to be 30% in consideration of various properties such as time of flow, strength, and chloride invasion resistance.

The purpose of this study is to evaluate the flexural property of semi-rigid pavement which is poured sulfur polymer emulsion into permeable open graded asphalt secured 15∼20 percentage ranges of porosity. From the bending test result, it was found that the flexural strength of the semi-rigid specimens were evaluated approximately 432% higher than that of the open graded asphalt specimens. And the strain of maximum load point was 38.8% lower than that of the open graded asphalt specimens.

In this study, presents methods on the reuse of leftover sulphur and examines the mechanical properties of pavement material containing sulfur polymer emulsion (SPE) for use in semi-rigid pavements. As the result of study, the optimum replacement level of acrylate with SPE was found to be 25% in consideration of various properties

Semi-Rigid Pavement is one of excellent paving methods adopting merits of Ascon and concrete paving. But, it has placed just only normal road pavement. In this case, we have constructed Semi-rigid pavement method at Deck pavement on service bridge and we have estimated Semi-rigid pavement as a new paving method replacing Ascon and concrete pavement.