Based on the feasibility analysis of the chloride’s released capability, a certain proportion of the chloride was added into the ordinary asphalt mixture to form a new chloride-stored asphalt mixture. The mixing proportion was determined and its pavement and anti-icing performance were analyzed. The research indicates that: the stored chloride has good releasability. The new asphalt mixture not only has better high temperature stability and low temperature anti-bending capability than the ordinary one, but could also remove the road ice effectively.

Contraposed the hydration heat of large volume concrete, based on the introduces of raw material, the effect of fly ash mix amount in large volume pile cap concrete was mainly analyzed combined with project case of Yellow River Bridge in Baotou-Shulinzhao Highway. Moreover the temperature and temperature stress in different mix amounts were analyzed by the finite element software to confirm the appropriate mix amount of fly ash and the mix proportion of concrete. Finally, the consequence of the large volume pile cap temperature control was certified by the practice of construction.

Ground Penetrating Radar is a method using high frequency impulse electromagnetic wave to detect underground media distribution. It has been gradually widely used as it has the advantage of high accuracy, fast and nondestructive respecting to the conventional method such as visual measurement and confirmation with drilling hole. In the tunnel construction process, it is easy occurred that the quality problem of insufficient lining thickness, the distance of steel arch centering too large and the concrete disengaging. The work achieved in this paper based on the project of LongSheng tunnel and its conclusion and suggestion has important practical engineering significance.

A new method is proposed to prepare carbon fiber reinforced concrete (CFRC) and carbon fiber (CF)/carbon black (CB) reinforced concrete in this paper. First, CF is dispersed in 0.4% carboxymethylcellulose sodium (CMC) water solution. Then, resolvable carbon fiber surfacing mat (RCFCM) is manufactured and cut into small patches. Finally, these patches are mixed with cement, sand, gravel, CB and water. During mixing, RCFCM patches are broken up once they meet with water. So, CF is dispersed into concrete. Results show that this method is feasible. CF/CB reinforced concrete possesses low resistivity (<100 Ω•cm), high compressive strength (≥35 MPa) and low contents of CF (0.3 Vol.%) and CB (0.6 Vol.%), so it can be used as a kind of conductive concrete for melting snow and deicing applications on highways. Both the mixing time and the curing period can affect the electrical and mechanical properties of CF/CB reinforced concrete.

With the development of highway and railway, the construction technique of bridge is developing at a lighting speed. Because of the need to across the river and channel, which span getting more and more large, the foundation of the bridge piers should be more and more stable. Lead to raising the load capacity of the pier foundation. The technique cofferdam construction is an effective mean to solve large foundation problems in deep water. And comparing the empirical value to the simulating value, the results demonstrate FLUENT is a reliable program to simulate the water resistance. This paper gives a model for complete resistance calculation and stability analysis of floating steel cofferdam which will provide a template for similar analysis of engineering application.