[논문]새로운 Simple Performance Testing 장비를 이용한 중온형 폼드 아스팔트 혼합물의 공용성 평가

김용주; 임수혁; 이호신; 황성도

새로운 Simple Performance Testing 장비를 이용한 중온형 폼드 아스팔트 혼합물의 공용성 평가
Evaluation of Warm Mix Asphalt Mixtures with Foaming Technology and Additives Using New Simple Performance Testing Equipment 원문보기

한국도로학회논문집 = International journal of highway engineering, v.10 no.4 = no.38, 2008년, pp.19 - 29

김용주 (University of Iowa.Public Policy Center) , 임수혁 (University of Nebraska) , 이호신 (University of Iowa.Pubic Policy Center) , 황성도 (Korea Institute of Construction Technology.Highway Research Department)

초록
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최근에 $135^{\circ}C^{\circ}C$ 이하의 온도에서 생산되는 중온형 아스팔트 혼합물의 새로운 생산 기술이 전세계적으로 개발되고 있다. 본 연구에서는 가열 아스팔트보다 낮은 온도에서 아스팔트를 효과적으로 골재에 분산시켜 코팅할 수 있는 폼드 아스팔트 기술을 이용하여 중온형 아스팔트 혼합물을 생산하였으며, 최근 개발된 새로운 Simple Performance Testing 장비를 이용하여 다양한 온도와 하중조건 하에서 중온형 폼드 아스팔트 혼합물의 공용성 특성을 평가하였다. 중온형 폼드 아스팔트 혼합물은 FG 64-22의 아스팔트를 거품상태로 만들어 중온으로 가열된 골재에 뿌려서 제조하였으며, 중온형 아스팔트 혼합물은 중온의 골재에 FG 64-22의 아스팔트를 액상 상태로 첨가하여 제조하였다. 중온형 폼드 아스팔트 혼합물은 중온형 아스팔트 혼합물보다 높은 동탄성계수와 Flow Number를 나타내었다. 따라서, $100^{\circ}C$로 가열된 골재를 사용하여 생산된 중온형 폼드 아스팔트 혼합물은 중온형 아스팔트 혼합물에 비하여 피로균열 및 소성변형 저항에 우수한 것으로 평가되었다.

Abstract ▼ AI-Helper

To produce asphalt mixtures at temperature significantly below $135^{\circ}C$, called "Warm Mix Asphalt (WMA)", new technologies are currently being developed worldwide. To produce WMA mixtures in this research, foaming technology is adopted to effectively disperse asphalt binder at lower temperature than hot mix asphalt (HMA) in the field. The main objectives of this study are to develop WMA process using foaming technology (WMA-foam) and evaluate its performance characteristics under various temperatures and loading conditions. WMA-foam mixtures were produced by injecting PO 64-22 foamed asphalt into warm aggregates whereas WMA mixtures were produced by adding PO 64-22 asphalt (without foaming) in the warm aggregates. Both dynamic modulus and flow number of WMA-foam mixtures were higher than those of WMA mixtures. Based on the limited dynamic modulus and repeated load test results, it is concluded that the WMA-foam mixtures using warm aggregates at $100^{\circ}C$ are more resistant to fatigue cracking and rutting than WMA mixtures.

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가설 설정

To create the foamed asphalt, a controlled flow of cold water was injected to the hot asphalt between 160℃ to 18010 in the expansion chamber. Figure 3 (a) shows the laboratory foaming asphalt equipment developed by Wirtgen, Inc and Figure 3 (b) ilhistrates the production process of foamed 쵸sphah in the expansion chamber. Hot asphalt is injected into the expansion chamber flirough a 2.

제안 방법

Four types of warm mixture specimens were prepared and tested to evaluate their fatigue crack and rutting resistances under various temperatures and loading conditions using new Simple Performance Testing (SPT) equipment. Dynamic modulus and repeated load tests were performed on the WMA-foam, WMA- foam/zeolite, WMA-foam/lime, and WMA mixtures following ASHTO TP 62 (2007) and NCHRP 9-29 protocols (2002, 2003), respectively.
The laboratory evaluation was performed on Mur different WMA mixtures by conducting dynamic modulus and repeate load tests. In this paper, the findings from laboratory tests are presented and the recommendations are made regardmg the warm mix asphalt process utilizing foamed asphalt and additives.
The (impacted test specimens were cured in the room temperature at 25 ℃ for one day before the test. The dynamic modulus and repeated load test results were analyzed to evaluate the fatigue crack and rutting resistances of the warm mixtures.
Dynamic modulus and repeated load tests were performed on the WMA-foam, WMA- foam/zeolite, WMA-foam/lime, and WMA mixtures following ASHTO TP 62 (2007) and NCHRP 9-29 protocols (2002, 2003), respectively. The gyratory compacted specimens with 100-mm diameter and 150- mm height were prepared for dynamic modulus and repeated load tests. The test specimens were compacted using the gyratory compactor 겮t 165 gyrations.
The main objetives of this research are to: 1) develop new environmentally frieridly WMA process using foaming technology and additives at lower production and compaction temperatures and 2) to evaluate its performance characteristics under various temperatures and loading conditions using new simple performance testing (SPT) equipment. The laboratory evaluation was performed on Mur different WMA mixtures by conducting dynamic modulus and repeate load tests. In this paper, the findings from laboratory tests are presented and the recommendations are made regardmg the warm mix asphalt process utilizing foamed asphalt and additives.

대상 데이터

The gyratory compacted specimens with 100-mm diameter and 150- mm height were prepared for dynamic modulus and repeated load tests. The test specimens were compacted using the gyratory compactor 겮t 165 gyrations. The (impacted test specimens were cured in the room temperature at 25 ℃ for one day before the test.

데이터처리

Using the dynamic modulus test remits measured at three different temperature and six different frequencies, as shown in Figure 10, the master curves were constructed for a reference temperature of 21 ℃ for each of three WMA mixtures. All model parameters and the empirical parameters of the WLF equation were obtained by minimizing the sum of the square of the error of the Sigmoid model usin응 the Excels Optimization Solver ! function. As can be seen from Figure 10, the best fit master curves match the measured moduli quite well.

이론/모형

The master curve of an asphalt mixture allows comparisons to be made over extended ranges of frequencies and temperature. To construct the master curve of WMA mixtures, Williams-Landel-Ferry (WLF) equation was used to obtain a shift factor and a nonlinear sigmoidal function is fitted using the Excel's optimization solver function as shown in Eq. 2 (NCHRP 2006).

성능/효과

As shown in Figure 11, the flow number of WMA-foam/lime mixtures is the highest followed by WMA-foam mixtures and WMA mixtures. Based on the limited test results, it can be concluded that lime may improve characteristics of WMA mixtures by increasing its resistance to rutting.
WMA-foam/lime mixture exhibited a highest flow number followed by WMA-foam and WMA mixtures. Based on the limited test results, it can be concluded that the WMA-fbam and WMA-foam/lime using the heated aggregates at 100 p is more compactable, slightly stiffer and rutting resistant than WMA mixtures using viigin asphalt without foaming.

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연합인증

새로운 Simple Performance Testing 장비를 이용한 중온형 폼드 아스팔트 혼합물의 공용성 평가
Evaluation of Warm Mix Asphalt Mixtures with Foaming Technology and Additives Using New Simple Performance Testing Equipment 원문보기

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새로운 Simple Performance Testing 장비를 이용한 중온형 폼드 아스팔트 혼합물의 공용성 평가 Evaluation of Warm Mix Asphalt Mixtures with Foaming Technology and Additives Using New Simple Performance Testing Equipment 원문보기

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새로운 Simple Performance Testing 장비를 이용한 중온형 폼드 아스팔트 혼합물의 공용성 평가
Evaluation of Warm Mix Asphalt Mixtures with Foaming Technology and Additives Using New Simple Performance Testing Equipment 원문보기

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