Operation Rules for Concrete Mixer Truck In Different Traffic States

A concrete mixer truck is a specialized vehicle delivering ready mix concrete from a concrete batching plant to a given construction site. During delivery the mixing tank must rotate at a low speed of around 2 rounds per minute to guarantee that the contained concrete will not get solidified. As a result, the center of gravity of the whole truck slides slightly to the rotating direction. Take a China concrete mixer truck for example. It rotates to the left, and its gravity center moves to the left side, which makes it to roll over more easily while turning to the right. Therefore, drivers running a China concrete mixer truck must be careful while making a turning on the right.

Most construction sites are near the urban area of a city, thus concrete mixer trucks usually have to run through city streets even though they follow a reasonably designed route, which makes it common for them to nail the brakes and turn sharply to avoid pedestrians and other vehicles. Influenced by economic factors, most mixer trucks are overloaded. According to the international standards, the safest model should be 6m3 concrete mixer truck, for larger tanks mean greater risk in traffic. In spite of this, mixing tanks of concrete trucks become larger and larger, and now a 8 cubic meters concrete mixer truck or a 12m3 concrete mixer truck proves to be medium-sized, for the largest tanks can be as huge as 16m3. Larger tanks mean heavier trucks, bigger inertia force, slower brakes and greater possibility of traffic accidents.

Over-speed takes blame for most traffic accidents caused by concrete mixer trucks. Take China for example. The government rules that no concrete mixer trucks should run at a speed over 50km per hour, yet almost no drivers follow the rule strictly. Some ready mix concrete suppliers even allow their drivers to exceed 50km/h in noisy urban streets.