## 2 Performance Test of Waterproof Cohesive Layer Material  
### Test Plans  
Basalt (4.75-9.5 mm) was selected as a gravel material, and 27 shear test schemes were used to analyze the bonding material, spreading scheme, and shear resistance of a waterproof cohesive material in different cement slab surface disposal schemes. The 27 test schemes are shown in Table 1.  
The \"AC-13+waterproof cohesive layer + cement concrete slab\" structure was used in the indoor shear test of the bridge deck interlayer materials. A \(150\times 150\times 150\) mm\({}^{3}\) cement concrete slab was fabricated and the slab surface was disposed (brushed cement concrete, grooved cement concrete, exposed aggregate cement concrete). After 7 days of maintenance under standard conditions, core samples were drilled with a 100 mm diameter core drill. Waterproof cohesive layers were laid on the surface of the cement concrete core samples with different asphalt and gravel content. Finally, the core samples were loaded into a \(101.6\times 87\) mm\({}^{2}\) Marshall test model, and a hot mix AC-13 asphalt mixture was loaded into the test model. The model was compacted with a compactor and formed after the asphalt surface was allowed to cool. The test model was removed, and a direct shear test was conducted. The forming and testing process of shear samples are shown in Figure 1. \begin{table}
\begin{tabular}{c c c c} \hline
**Asphalt Type** & **Spreading Scheme** & **Disposal Scheme of Cement Slab Surface** & **Test Scheme** \\ \hline  & & brushed cement concrete & Emu-A-brushed \\  & A & grooved cement concrete & Emu-A-grooved \\  & & exposed aggregate cement concrete & Emu-A-exposed \\ \hline SBS-modified & & brushed cement concrete & Emu-B-brushed \\ emulsified asphalt & B & grooved cement concrete & Emu-B-grooved \\  & & exposed aggregate cement concrete & Emu-B-exposed \\ \hline  & & brushed cement concrete & Emu-C-brushed \\  & C & grooved cement concrete & Emu-C-grooved \\  & & exposed aggregate cement concrete & Emu-C-exposed \\ \hline  & & brushed cement concrete & Ord-A-brushed \\  & A & grooved cement concrete & Ord-A-grooved \\  & & exposed aggregate cement concrete & Ord-A-exposed \\ \hline  & & brushed cement concrete & Ord-B-brushed \\
90 ordinary hot asphalt & B & grooved cement concrete & Ord-B-grooved \\  & & exposed aggregate cement concrete & Ord-B-exposed \\ \hline  & & brushed cement concrete & Ord-C-brushed \\  & C & grooved cement concrete & Ord-C-grooved \\  & & exposed aggregate cement concrete & Ord-C-exposed \\ \hline  & & brushed cement concrete & Mod-A-brushed \\  & A & grooved cement concrete & Mod-A-grooved \\  & & exposed aggregate cement concrete & Mod-A-exposed \\ \hline  & & brushed cement concrete & Mod-B-brushed \\ SBS-modified asphalt & B & grooved cement concrete & Mod-B-grooved \\  & & exposed aggregate cement concrete & Mod-B-exposed \\ \hline  & & brushed cement concrete & Mod-C-brushed \\  & C & grooved cement concrete & Mod-C-grooved \\  & & exposed aggregate cement concrete & Mod-C-exposed \\ \hline \end{tabular} Spreading scheme A: Asphalt is first sprayed on the road surface, then gravel is sprayed, and a single waterproof cohesive layer is formed by rolling: Spreading scheme B: Asphalt is first sprayed on the road surface, then crushed stone wrapped with hot asphalt is sprayed, and a single waterproof cohesive layer is formed by rolling: Spreading scheme C: Asphalt is first sprayed on the road surface, then gravel is sprayed, followed by a layer of asphalt, yielding a double waterproof cohesive layer after rolling: Brushed cement concrete: Before setting the initial cement concrete board, wet cotton cloth was used to form a texture on the surface of the cement board with a depth of approximately 3 mm; Grooved cement concrete: Grooves (5 mm width, 3 mm depth, and 10 mm spacing) were placed on the surface of cement concrete board; Exposed aggregate cement concrete: When the cement concrete board was not hardened, the surface mortar is removed to expose approximately 1 mm of coarse aggregate.  
\end{table}