Cementitious capillary crystalline waterproof material (CCCW) is a material that can react with substances inside the concrete, generating crystals that fill the pores and cracks in the concrete. This chemical reaction is expected to improve the mechanical properties of the concrete. This study investigated the effects of CCCW content and water-cement ratio (W/C) on the compressive behavior of cementitious capillary crystalline waterproof concrete (CCCWC). The results indicated that as the CCCW content increased from 0 % to 1.5 % for W/C of 0.4, the compressive and tensile strength values of concrete slightly decreased. This is because excessive CCCW generates too many crystals within the concrete, leading to internal matrix expansion and crack formations. However, in the cases of W/C of 0.45 and 0.5, the compressive and tensile strength values of the CCCWC increased with increasing CCCW content from 0 % to 0.5 %, but declined with 1.5 % CCCWC addition. The reaction between CCCW and concrete generates numerous crystals, which densify the concrete matrix and enhance its strength. Moreover, with increasing W/C, the CCCWC's compressive strength and tensile strength decreased due to the increased porosity of the concrete matrix and the reduced availability of the concrete constituents that react with CCCW. Furthermore, the appropriate choice of CCCW content and W/C can significantly enhance the slope and peak stress of the stress-strain curve. Based on this, a compressive constitutive model of CCCWC was established. The findings showed that the optimal CCCW content varied with W/C. For instance, for a W/C of 0.4, the maximumcompressive strength of 54.82 MPa was achieved without any CCCW addition. In contrast, the addition of 0.5 % CCCW to concrete produced with W/C of 0.45 and 0.5 resulted in the highest compressive strengths of 50.98 MPa and 44.90 MPa, respectively.

中文翻译：

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水泥基毛细结晶防水材料对混凝土力学性能的影响


水泥基毛细管结晶防水材料 （CCCW） 是一种可以与混凝土内部的物质反应，产生填充混凝土孔隙和裂缝的晶体的材料。这种化学反应有望改善混凝土的机械性能。本研究探讨了 CCCW 含量和水灰比 （W/C） 对水泥基毛细结晶防水混凝土 （CCCWC） 压缩行为的影响。结果表明，当 W/C 为 0.4 时，当 CCCW 掺量从 0 % 增加到 1.5 % 时，混凝土的抗压强度和抗拉强度值略有下降。这是因为过多的 CCCW 会在混凝土内产生过多的晶体，导致内部基体膨胀和裂缝形成。然而，在 W/C 为 0.45 和 0.5 的情况下，CCCWC 的抗压强度和抗拉强度值随着 CCCW 含量从 0 % 增加到 0.5 % 而增加，但随着 CCCWC 添加 1.5% 而下降。CCCW 与混凝土之间的反应产生许多晶体，使混凝土基体致密化并增强其强度。此外，随着 W/C 的增加，由于混凝土基体孔隙率的增加以及与 CCCW 反应的混凝土成分的可用性降低，CCCWC 的抗压强度和抗拉强度降低。此外，CCCW 含量和 W/C 的适当选择可以显著提高应力-应变曲线的斜率和峰值应力。基于此，建立了 CCCWC 的压缩本构模型。结果表明，最佳 CCCW 含量随 W/C 而变化。例如，当 W/C 为 0.4 时，在没有添加任何 CCCW 的情况下实现了 54.82 MPa 的最大抗压强度。相比之下，在 W/C 为 0.45 和 0.5 的抗压强度最高，分别为 50.98 MPa 和 44.90 MPa。