國內的再生瀝青混凝土(recycled asphalt concrete,RAC)所採用之再生配合設計通常使用拌合圖表（blending chart）決定添加再生劑(recycling agents,RA)或軟化劑(softening agents,SA)的比例，使RAP表面之老化瀝青回復至設計所需的黏滯度(viscosity)，但如果在重新拌和的過程中產生黑石頭現象(black rock)，會導致承載能力下降，相對的使用拌合圖表作為設計再生瀝青混凝土之黏結料的方法便不適用了。
　　
　　本研究使用不同老化程度之回收料(RAP)搭配不同添加含量，並直接以目標黏滯度2000 poise之AC-20瀝青為新鮮黏結料，依黑石頭檢驗之三種模擬拌合狀況(黑石頭、實際拌合（standard practice或real world）、完全拌合（total blending))，採用間接張力試驗(Indirect Tension test)、磨耗試驗(Cantabro Abrasion test)與回彈模數試驗(Modulus of Elasticity test)來探討RAP之黑石頭現象。由試驗結果得知，間接張力試驗部分，不論RAP老化程度與RAP含量的高低，沒有發現黑石頭現象或只產生部份黑石頭現象，其中又以RAP-4（28400 poise）最接近黑石頭現象；磨耗率試驗部分，隨著RAP老化程度增加，黑石頭現象越趨明顯，其中在老化程度為RAP-12(251000 poise)下，不論含量高低均有黑石頭現象；回彈模數試驗部分，不論RAP老化程度與RAP含量的高低均無發現黑石頭現象。
　　
　　總體來說，經由各項成效試驗檢驗，只有少數黑石頭現象發生，雖然RAP的老化程度確實影響實際拌合的結果，但並沒有明顯的關係存在，故RAP在不添加軟化劑或再生劑的情況下直接取代部份新鮮粒料之方法並不可行。

　　The viscosity blending chart which is the most widespread approach for estimating the percent of softening agent (SA) or recycling agent (RA) has been used to restore the aged binder to the acceptable level of consistency. However, the performance of recycled asphalt concrete would diminish if the black rock phenomenon occurs, which possibly makes the blending chart for the mixture design of recycled asphalt concrete become unsuitable.
　　In this study, different sources of RAP were collected in which different aged levels of asphalt were considered. These RAPs were mixed with AC-20 asphalt separately to form the mixtures. Three possible interactions between new and old binders i.e. black rock, standard practice and total blending were considered. The specimens for three mixtures cases were calibrated and then conducted by the indirect tension strength test, Cantabro abrasion test and resilient modulus test to evaluate the effect of black rock of RAP on the performance of recycled asphalt concrete. The experimental results from indirect tensile test showed that the black rock phenomenon was not obvious regardless of ageing degrees and quantities of RAP except RAP-4 (28400 poise). The black rock phenomenon becames more apparent in Cantabro abrasion test as the ageing degrees of RAP increased, especially RAP-12(251000 poise). However, the black rock phenomenon was not detected in resilient modulus.
　　As a whole, little effect of black rock happened in the recycled asphalt concrete and the ageing degrees of RAP did influence the results of standard practice in an unobvious relationship. Therefore, it is impossible for RAP to replace the virgin aggregate in the mixture design without adding the softening agent or recycling agent.

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