H I S T O R I C A L L I M E C O N C R E T E T R I A L S
Lime based concrete has been successfully used for over 10,000 years. Only relatively recently the lime binder replaced with Portland cement since its invention some two hundred years ago. The huge environmental implications of cement based concrete is widely documented and problematic for a number of reasons.
They include the use of huge kilns fired at high temperatures which it turn require large amounts of energy and subsequently this emits high levels of CO2. After water modern concrete is the most widely used substance in the world.
From a conservation prospective modern concrete can be extremely damaging to historical buildings due to its non vapour permeability, intrusive and irreversible nature. The purpose of the trials was to reproduce an alternative ecological lime based vapour permeable concrete suitable for floor & foundation systems based on historical evidence and specifications. Lime in comparison to Portland cement is fired at a lower temperature requiring less fuel. Lime naturally resorbs CO2 during its lifespan and is importantly biodegradable after use. Historical lime concrete is a versatile well proven forgotten resource that has a place in both modern construction and historical building conservation respectively.