Abstract Roller compacted concrete ( RCC ) is a zero-slump concrete that has been extensively used in road pavements. This concrete has been considered, due to its economic and environmental potentials, including reduced construction and maintenance costs and greater environmental compatibility. A unique feature of the Roller Compacted Concrete Pavement ( RCCP ) is its low water-to-concrete ( W C ) ratio. Hence, RCCP is sensitive to the water content, compared to conventional concrete. This paper conducts an experimental studies on the effect of different ratios of W C on the fracture parameters of RCCP . For this purpose, three-point bending tests were performed on 162 notched beams and mechanical properties tests (compressive strength ( f c ), tensile strength ( f t ) and modulus of elasticity ( E )) were performed on 54 specimens with different W C ratios ( 0.3 t o 0.55 ). For all mixtures, the fracture parameters were determined using three methods: work of fracture method ( WFM ), size effect method ( SEM ), and boundary effect method ( BEM ). The results indicate a significant effect of W C ratio on RCCP fracture parameters, specifically, by decreasing w/c ratio from 0.55 t o 0.3 it was observed that; (A) The initial fracture energy ( G f ) and the total fracture energy ( G F ) increase in all three methods as a power function on f c ; (B) The fracture toughness ( K IC ) increases linearly in SEM and BEM methods; (C) The characteristic length ( L ch ) in WFM , the effective length of the fracture process zone ( C f ) in SEM , and the reference crack length (ductility index) ( a ∞ ∗ ) in BEM are decreased. The results also show that there is a relationship between G F measured by WFM method, and the G f measured by SEM and BEM methods ( G F ≅ 2.43 G f ( SEM ), G F ≅ 2.61 G f ( BEM )).

中文翻译：

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水灰比对碾压混凝土路面（RCCP）断裂行为和延性的影响

摘要 碾压混凝土（RCC）是一种零坍落度混凝土，广泛用于道路路面。由于其经济和环境潜力，包括降低的施工和维护成本以及更大的环境兼容性，这种混凝土已被考虑在内。碾压混凝土路面 (RCCP) 的一个独特之处在于其低水混凝土 (WC) 比。因此，与传统混凝土相比，RCCP 对含水量敏感。本文对不同WC配比对RCCP断裂参数的影响进行了实验研究。为此，对 162 根缺口梁进行了三点弯曲试验和力学性能试验（抗压强度（fc），对具有不同 WC 比率（0.3 至 0.55）的 54 个试样进行拉伸强度 (ft) 和弹性模量 (E))。对于所有混合物，使用三种方法确定断裂参数：断裂功法（WFM）、尺寸效应法（SEM）和边界效应法（BEM）。结果表明，WC 比对 RCCP 断裂参数有显着影响，具体而言，通过将 w/c 比从 0.55 降低到 0.3，观察到：(A) 在所有三种方法中，初始断裂能 (G f ) 和总断裂能 (GF ) 作为 fc 的幂函数增加；(B) SEM 和 BEM 方法中断裂韧性 (K IC ) 线性增加；(C) WFM 特征长度(L ch )，SEM 断裂过程区有效长度(C f )，BEM 中的参考裂纹长度（延展性指数）（ a ∞ ∗ ）减小。结果还表明，WFM方法测得的GF与SEM和BEM方法测得的Gf之间存在关系（GF≅2.43Gf（SEM），GF≅2.61Gf（BEM））。