US 7,815,728 B2 · High SRI cementitious systems for colored concrete

Abstract

IR reflective cementitious systems comprising one or more IR reflective pigments are provided. The cementitious systems of the invention may be in the form of mixtures which increase the total solar reflectivity (TSR or albedo) and the Solar Reflectance Index (SRI) of concrete are provided. The cementitious systems are infrared reflective and may be toppings mixed with water for application to existing concrete surfaces, or dry-shake hardeners for application to freshly-placed plastic concrete. The formulations of the invention utilize one or more of cementitious binder(s), graded aggregates, super-plasticizers, one or more pigments selected for improving infrared reflectivity and color composition, and/or optionally other additives, such as dry redispersible polymers or fillers to provide decorative and LEED compliant, highly durable (sustainable) concrete hardscapes and other decorative concrete.

Claims19

Dependent claims

A cementitious system comprising:

an infrared reflective pigment composition comprising
i) one or more infrared reflective pigments, wherein at least one of the one or more infrared reflective pigments is a black infrared reflective pigment having a percent reflectance at 1000 nm of at least 40%, as measured in white portland cement mortar, and is selected from the group consisting of manganese-vanadium oxide spinels, chromium green-black hematites, aluminum- and titanium-doped chromium green-black modified hematites, chromium iron oxides, hematite chromium green-blacks, iron chromite brown spinels, and perylene blacks;
and
ii) a cementitious matrix comprising cement and aggregates,
wherein the cementitious system is colored with pigments compliant with ASTM C979.

2 more elements

Dependencies are inferred from the claim text.

High SRI cementitious systems for colored concrete

Life of this patent

High SRI cementitious systems for colored concrete

Life of this patent

Abstract

Claims19