PURPOSES : The purpose of this study is to analyze not only the strength but also the durability and abrasion resistance of concrete pavements as increasing the cases of domestic concrete pavement damage which do not meet the service years. METHODS: The bottom layer of a two-lift concrete pavement was paved with original Portland cement (OPC) with 20~23 cm thickness. On the other hand, the top-layer, which is directly exposed to the environment and vehicles, was paved with high-performance concrete (HPC) with 7~10 cm thickness. For the optimal mixed design of the top-layer material of a two-lift concrete pavement, silica fume and polymer powder were mixed. Furthermore, it analyzes abrasion resistance of concrete as follow‘ ASTM C 779’which is dressing wheel abrasion test method. RESULTS : As a result, abrasion resistance is improved with increasing the silica fume ratio. When the polymer powder is mixed, abrasion resistance of concrete is much improved. However, the effect of mixing ratio is not significant. It is very effective that adding both silica fume and polymer powder occur 20~40% of abrasion comparing with OPC variables. CONCLUSIONS : The concrete strength and durability increased with silica fume and polymer powder. In particular, it is significant increasing strength of polymer powder under the flexural strength. In the abrasion resistance side, it is also significant when the silica fume and polymer powder used together.

PURPOSES : This purpose of this study is to analyze the effect to autogenous shrinkage of the top-layer material of a two-lift concrete pavement mixing both silica fume and polymer powder. METHODS: The bottom-layer of a two-lift concrete pavement was paved with original portland cement (OPC) with a 20~23 cm thickness. Additionally, the top-layer which is directly exposed to the environment and vehicles was paved with a high-performance concrete (HPC) with a 7~10 cm thickness. These types of pavements can achieve a long service life by reducing joint damage and increasing the abrasion and scaling resistance. In order to integrate the different bottom and top layer materials, autogenous shrinkage tests were performed in this study according to the mixing ratio of silica fume and polymer powder, which are the admixture of the top-layer material. RESULTS: Autogenous shrinkage decreased when polymer powder was used in the mix. Contrary to this, autogenous shrinkage tended to rise with increasing silica fume content. However, the effects were not significant when small amounts of polymer powder were used (3% and 11%). CONCLUSIONS : The durability and compressive strength increase when silica fume is used in the mix. The flexural strength considerably increases and autogenous shrinkage of concrete decreases when polymer powder is used in the mix. As seen from above, the proper use of these materials improves not only durability, but also autogenous shrinkage, leading to better shrinkage crack control in the concrete.

도시의 인구밀도가 높아지고 자동차의 보급이 확대됨에 따라 도로가 확장되고 있다. 도로의 확장은 도로와 주거지를 가깝게 만드는 원인이 되었고 이에 따라 교통소음 피해가 증가하게 되었다. 최근에는 도로와 인접한 주거지역, 공공기관, 병원 등에서 지속적인 소음피해가 발생하여 시민들의 불편이 증가 하였다. 도로교통소음은 자동차 자체에서 발생되는 소음과 타이어와 노면사이에서 발생하는 소음으로 구분되며 실제 자동차 주행으로 인해 발생하는 모든 소음 중에서 타이어와 노면사이에서 발생하는 소음이 70% 정도를 차지하고 있다. 따라서 도로교통 소음을 줄이기 위해서는 타이어와 노면사이에서 발생하는 소음을 억제하는 것이 중요 하다. 본 연구는 주행 중인 차량으로 인해 발생하는 도로 교통 소음을 저감시킬 수 있는 복층 저소음 아스팔트 포장의 시공 전·후의 5분 등가소음도 측정을 통해 일반 밀입도 아스팔트 포장과 복층 저소음 아스팔트 포장의 소음 저감 효과를 비교하였다. 추가적으로 저소음 아스팔트 포장의 성능 유지를 위한 방안으로 제시된 청소차의 효율을 확인하고자 공극 막힘을 인위적으로 재현한 뒤 고압 살수·진공 흡입 청소차를 동원하여 청소를 실시하고 청소 전 후의 현장투수계수 시험을 통해 공극 회복 평가를 수행하였다.