Pozzolans have been used for millennia in cementitious materials dating back to the Roman Empire. The benefits of pozzolan have been well documented and include attributes such as improved concrete plastic properties, higher strength, enhanced durability, lower permeability, and resistance to both Alkali Silica Reactivity (ASR) and Sulfate attack.
Modern concrete formulations can take advantage of the Roman process of converting Calcium Hydroxide (CH) into Calcium-Silicate-Hydrate (CSH), the binder in concrete, by doing what they did: adding sufficient natural pozzolan to consume all the available CH in the concrete. In doing so, a potentially destructive by-product in modern day concrete (the CH) is converted into performance and endurance enhancing CSH. However, when CH, a by-product of the hydraulic reaction of cement and water, is left to its own devices, it creates porosity in concrete. The porosity allows for the ingress of deleterious chemicals and water, which then leads to harmful reactions within the concrete - such as Alkali Silica Reactivity (ASR), Sulfate attack, Chloride attack on reinforcement, efflorescence, and freeze-thaw damage. The by-product CH can help fortify your concrete – when natural pozzolan is added to the concrete mix, or it can initiate destructive processes in the concrete that will
lead to concrete failure. Choose durability – choose natural pozzolan.
With an ever-changing landscape to the availability of pozzolans for the industries that we serve, CR Minerals has patented several of our products for use in the concrete industry as well as the oil and gas sector. These patents offer product protection for our customers and ensures that the performance they receive is the same high-end design that was developed through years of product development.
CR Minerals has been awarded a variety of patents by the US Patent and Trademark Office and continues to innovate with other technologies as we expand our intellectual property portfolio. Additionally, we have other patents that are pending as well as patents pending in Canada and Japan.
Our patents fall into two broad categories. The first category surrounds remediating fly ash to produce a material (Tephra® RFA) that can meet a Class F or Class C ASTM C618 product specification. The materials used to produce these Tephra® RFAs includes waste fly ash, Class C fly ash, natural pozzolans including metakaolin, slag and other materials. Our patents in this space include USPTO numbers 9561983, 9611174, 10017418, 10689292, 10370295, and 10377667.
The second category of patents encompasses using our technology and applying it to oil and gas applications. Materials used to make these Tephra® OG products are similar to those used to make our Tephra® RFAs and result in cementitious products that have enhanced downhole performance. Our patents for these applications include 104576001 and 10829414.