Taking a Hard Look at Concrete's Carbon Footprint

If there was any thread of hope for skeptics that global warming could be controlled by merely incremental changes to industrial processes and our way of life, the United Nation’s blue-ribbon Intergovernmental Panel on Climate Change dashed that permanently in August.

As U.N. Secretary-General António Guterres said in releasing the group's report, it was “a code red for humanity. The alarm bells are deafening, and the evidence is irrefutable.”

The report said the scientific consensus the brink of reaching the global increase of 1.5 degrees Celsius above pre-industrial levels was “… perilously close. We are at imminent risk of hitting 1.5 degrees in the near term. The only way to prevent exceeding this threshold, is by urgently stepping up our efforts, and pursuing the most ambitious path.”

Solidia uses a new formula for cement. Its hydrothermal liquid-phase densification (rHLPD) process uses less limestone (50% vs. 66%) and operates at significantly lower temperature (1200 degrees F) to bond and harden the particle mixture, cutting greenhouse gases by up to 30% while also saving energy. Another money saver is that it can be used in existing kilns.

In the concrete curing process, the Solidia Cement reacts with, and traps, CO2 instead of using water, consuming up to 240 kg of CO 2 , leaving 3-5% of the finished product as solid CO2 and allowing recovery of the water that’s used.  The company also claims that, “Unlike traditional ordinary portland cement (OPC), Solidia precast products can be recycled before curing, potentially eliminating tons of concrete landfill waste every year.” 

Read More