[Image above] Photographs and SEM images of color pigment admixtures used in a recent study of colored concrete: red (a, d), blue (b, e), and green (c, f). Credit:Heerah et al.,建筑材料中的案例研究(CC BY-NC-ND 4.0)
For anyone who visits Columbus, Ohio, the莱夫塔is an immediate eye-catcher as one of the tallest and historically rich buildings in the city. Yet as much as LeVeque is celebrated for itsArt Deco-style architecture, another building featuring historically rich architecture is often derided instead—theOhio History Center.
俄亥俄历史中心是野蛮的建筑在美国。野蛮主义的重点是简约的结构，这些结构展示了裸露的建筑材料和装饰设计上的结构元素。
When the Center originally opened in 1970, architects lauded the structure as bold and imaginative. Nowadays, many people view the structure as an ugly, giant brown box.
野蛮主义和混凝土经常在许多人的脑海中纠缠在一起，而混凝土的想法除了庞大，单片和“块状”的建筑材料之外，很难想象。但是，有许多建筑师专注于将混凝土结构栩栩如生，例如通过使用彩色混凝土。
Concrete can becolored in a variety of ways, including through staining, dyeing, and整体颜色，这是将颜料混合到水泥中的时候。积分颜色是最受欢迎的新放置混凝土的最受欢迎的方法之一，下面的视频解释了使用积分颜色的一些注意事项。
Manyintegral pigments由金属氧化物（例如铁氧化物）制成。然后achieving the desired color with integral pigments是制造商的主要关注点，考虑颜料也可能影响水泥的其他特性，也很重要 - 就像最近的一个open-access study做过。
The researchers come from Xi’an Jiaotong-Liverpool University (China) and Mohammed VI Polytechnic University (Morocco). They wanted to explore how pigment may affect the physical, chemical, and mechanical properties of cement. To do so, they characterized several cementitious mixes produced with three different color pigments (red iron oxide, blue cobaltous aluminate oxide, and green chromium oxide) and two types of cement (Portland cement and Portland-slag with fly ash blended cement).
They found that while the blue and red pigments did not significantly affect the concrete’s water absorption and porosity, samples containing the green chromium oxide pigment showed a drastic increase in these properties with rising pigment content, independently of the cement used.
同样，虽然蓝色和红色颜料并没有显着影响混凝土的抗压强度，但绿色颜料确实如此。
In a Xi’an Jiaotong-Liverpool Universitypress release，研究人员解释说，用于生产氧化铬的化学方法是这些发现的原因。
当麝香木是一种用于生产绿色颜料的矿物质时，用水泥水合水合时，“棉花糖会产生大量的成分，导致过度多孔，从而降低了强度和寿命，”新闻稿解释说。
“However, other studies have found that there is no adverse effect when using green pigment consisting solely of chromium (III) oxide, with no muscovite,” says lead author Mehreen Z. Heerah, a graduate of Xi’an Jiaotong-Liverpool University’s Department of Civil Engineering.
因此，研究人员得出的结论是，“在使用水泥混合物中，应研究色素的含量和纯度，因为它可能会对样品的性质产生不利影响。”
The open-access paper, published in建筑材料中的案例研究， 是 ”Characterisation and control of cementitious mixes with colour pigment admixtures” (DOI: 10.1016/j.cscm.2021.e00571).