Its a bad idea. You wouldn't be any faster then with normal shoes the spikes are to small to get grip. Just designed to penitrate rubbery track surface with little effect. Use on grass could break the spikes. Trust me just use cleats.
There are special spike shoes used for grass that javelin throwers use. The spikes can be as long as 1". They are designed to grip the slippery surface of grass/mud. However, they are not designed for the 100m dash.
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You really shouldn't. Spikes are made to grip the track and have no support for your feet. Running with them on cement gives you a greater risk of developing shin splints. They also make an annoying noise.
You will ruin your spike shoes by walking/running on cement with them. It wears down the spikes and makes them very hard to get out of the shoes. We have developed a product for the very purpose of allowing the athlete to cross cement or other hard surfaces without damaging the spikes or shoes.