## 5 Conclusions  
Indoor shear tests were used to determine the shear strength of different slab disposal schemes for cement slabs (brushed cement concrete, grooved cement concrete, and exposed aggregate cement concrete), waterproof cohesive layer materials (SBS-modified emulsified asphalt, 90 ordinary hot asphalt, and SBS-modified asphalt), and different combinations of spreading schemes. The optimum material composition for the waterproof cohesive layer was presented.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Material** & **Prediction Model** & \(N_{e}\) \\ \hline SBS-modified emulsified asphalt & \(N_{f}=100\times 34.38\tau^{-6.704}\Big{(}\frac{T_{a}}{T_{0}}\Big{)}^{-1.10}=158 \times 10^{4}\) & \\
90 ordinary hot asphalt & \(N_{f}=100\times 18.42\tau^{-6.675}\Big{(}\frac{T_{a}}{T_{0}}\Big{)}^{-1.20}=82 \times 10^{4}\) & \(144\times 10^{4}\) \\ SBS-modified asphalt & \(N_{f}=100\times 41.97\tau^{-6.719}\Big{(}\frac{T_{a}}{T_{0}}\Big{)}^{-1.06}=196 \times 10^{4}\) & \\ \hline \hline \end{tabular}
\end{table}
Table 16: Predicted shear fatigue life for different waterproof cohesive layer materials at 15 \({}^{\circ}\)C (0.4 MPa interlayer shear stress).  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Interlayer Temperature (\({}^{\circ}\)C)** & 11.8 & 16.4 & 23.2 & 27.8 & 32.3 \\ \hline
**Distribution Frequency** & 0.64 & 0.19 & 0.09 & 0.06 & 0.02 \\ \hline \hline \end{tabular}
\end{table}
Table 14: Representative temperature distribution frequency between decks in Ulanchabu.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Material** & \(Z_{N}\) & \(T_{eq}\) (\({}^{\circ}\)C) \\ \hline SBS-modified emulsified asphalt & 1.10 & 15.15 \\
90 ordinary hot asphalt & 1.20 & 15.24 \\ SBS-modified asphalt & 1.06 & 15.12 \\ \hline \hline \end{tabular}
\end{table}
Table 15: Equivalent temperatures of different waterproof cohesive layer material.  
The influence of shear stress and temperature on the fatigue life of the waterproof cohesive layer was determined from indoor shear fatigue tests. The shear fatigue life of the waterproof cohesive layer material decreases by more than 70% when the stress ratio increases by only 0.1, and the fatigue life of the waterproof cohesive layer material decreases by more than 20% when the temperature increases by 5 \({}^{\circ}\)C.  
An equation for predicting the indoor shear fatigue of a waterproof cohesive layer material at 15 \({}^{\circ}\)C was established, and temperature correction was applied. Based on the temperature distribution in the cement concrete bridge deck, a method for calculating the equivalent temperature \(T_{eq}\) of the interlayer shear fatigue of the bridge deck using the distribution frequency \(f_{i}\) of temperature \(T_{i}\) during service is proposed.  
The design method and design index for a bridge deck considering shear fatigue damage between the waterproof cohesive layers were discussed. The application results show that the interlayer contact does not meet the shear fatigue requirements when fatigue cracking and permanent deformation of a traditional asphalt layer are taken as design indices and when fatigue of the interlaminar materials are not considered. Therefore, the design index of the interlayer shear fatigue should be proposed.  
Conceptualization, X.W. and N.F.; methodology, N.F. and Z.S.; formal analysis, H.Y. and Y.S.; investigation, N.F. and Y.S.; resources, X.W.; data curation, N.F. and H.Y.; writing--original draft preparation, N.F. and L.Y.; writing--review and editing, N.F., X.W., H.Y. and Z.S.; visualization, N.F., X.W., H.Y. and L.Y.; supervision, X.W.; funding acquisition, X.W.  
This research was funded by Construction of science and technology projects by Ministry of Communications of China (2013 318 J08 220), and the Inner Mongolia Autonomous Region transportation science and technology project of China (NJ-2018-23).  
The authors declare no conflicts of interest.