Low Heat Cement is intended to reduce the "heat of hydration" in concrete. This property makes it excellent for mass concrete pours in which the pace of temperature rise and maximum temperature obtained must be managed to prevent the danger of thermal cracking. The lower the heat of hydration, the longer the concrete can be kept at low temperatures before it begins to harden. The main advantage of low heat cements is that they can be kept at lower temperatures for longer before setting starts to occur. This means that more heat can be removed from the concrete during freezing conditions, reducing the risk of damage caused by cold joints in poured sections of road or footpath. Low heat cements are also useful when faster setting times are required than normal cements can provide. They can be used where a solid surface is needed quickly, but not immediately; for example, along pedestrian walkways where people can safely cross while the cement is still soft. Disadvantages include their cost and the need for adequate ventilation when they are being used in large projects. Low heat cements are available as water-redispersible powders that can be dispersed into water to make a paste. They are usually colorless and do not contain any additives to increase their strength.