I am much more skeptical about this development than the scientists involved. My feeling is that the cement could be vulnerable to weather erosion, and the reflective quality of the material could drastically deteriorate. But it is worthwhile for people to be aware of what has been developed - https://www.chemistryworld.com/news/reflective-cement-could-help-buildings-stay-cool-in-hot-weather/4022071.article?utm_source=cw_weekly&utm_medium=email&utm_campaign=cw_newsletters