The suitability of waste cement concrete dust (CD) and conventional hydrated lime (HL) as fillers in bituminous concrete was investigated. Bituminous mixes containing CD or HL in different proportions were designed. Their performance was studied using the Marshall quotient, indirect tensile strength, tensile strength ratio (TSR), passive and active adhesion and Cantabro tests. The cost of the various mixes and their greenhouse gas (GHG) emissions were also compared. Finally, the optimum filler content for both mixes was determined. The mixes containing CD displayed rutting, cracking and ravelling resistance similar to those of conventional mixes. CD offered improved affinity towards bitumen and ensured excellent moisture resistance (TSR > 80%). Compared with a traditional mix (4% HL), the use of CD marginally lowered the cost by around 3–8% and reduced the GHG emissions by more than 50%. Overall, the addition of CD ensured satisfactory engineering performance at a relatively lower cost and significantly lower GHG emissions.

中文翻译：

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沥青混凝土中废弃水泥混凝土粉尘的有效利用

研究了废水泥混凝土粉尘（CD）和常规熟石灰（HL）作为沥青混凝土填料的适用性。设计了含有不同比例的 CD 或 HL 的沥青混合料。使用马歇尔商、间接拉伸强度、拉伸强度比 (TSR)、被动和主动附着力以及坎塔布罗测试研究了它们的性能。还比较了各种混合物的成本及其温室气体（GHG）排放量。最后，确定了两种混合物的最佳填料含量。含有 CD 的混合物表现出与传统混合物相似的抗车辙、开裂和散开性能。CD 提高了对沥青的亲和力，并确保出色的防潮性 (TSR > 80%)。与传统混合物（4% HL）相比，CD 的使用使成本略微降低了 3-8% 左右，并减少了 50% 以上的温室气体排放。总体而言，CD的添加确保了以相对较低的成本实现了令人满意的工程性能，并显着降低了温室气体排放。