一种新的沥青路面的喷涂处理旨在降低它们对城市热岛效应的贡献，并防止它们如此容易破裂。
- Oct 17, 2021
- 3 min read
作者：Andy Corbley
出处：Good News Network
翻译：Allen Weng
基于二氧化钛，这种涂层不仅反射和散射阳光和紫外线，使人行道和道路表面保持凉爽，而且暴露在阳光下时还会产生化学反应，清除空气中的污染物。
该产品本身虽然仍在开发中，但为了帮助沥青保持其柔韧性并防止其在其使用寿命期间开裂已作为“道路再生剂”进行销售。
Pavement Technology正在与得克萨斯 A&M 大学一起试用他们的二氧化钛喷雾剂。他们向A&M大学提供空气质量样本，以及用喷雾剂处理过的沥青的道路核心样本。
早期的结果是很有希望的：该公司声称一条一英里长的道路用了他们的道路再生剂处理过之后，周围空气中的氮氧化物 (NOx) 水平降低了 30% 到 40%，相当于一个 20 英亩的公园。
二氧化钛通常用于防晒霜中，因为它可以有效地反射阳光。
黑色的柏油碎石和混凝土建筑都紧密地挤在一起，会造成城市热岛效应。白天太阳将这些表面加热，然后它们又将热量向外辐射到每个人和所有事物，并阻止城市在晚上凉下来。
根据城市的大小、密度和气候，这会使阿德莱德等城市的平均每日温度升高 4°F，而新加坡这样的城市则升高 14°F。作为对有效散热的绿色空间和绿色屋顶的补充，两者可以一起使用抵消城市热岛效应。
除此之外，喷雾替代了道路中的麦芽烯——在沥青的黑色油性沥青成分中的化合物，从而维护道路更长时间。
这不仅减少了道路维修和他们所依赖的重型机械所需的排放，还减少了与道路施工相关的交通减速造成的排放，这是前往任何大都市地区的通勤者都可以庆祝的福音。
A spray-on treatment for asphalt roads aims to curb both their contribution to the urban island heat effect, and stop them from breaking so easily.
Based on titanium-dioxide, it not only reflects and scatters away sunlight and ultraviolet light, keeping the surface of sidewalks and roads cooler, but it also creates a chemical reaction when exposed to sunlight that clears away airborne pollutants.
Even considering these two qualities, the product itself, while still in development, is being marketed as a “road rejuvenator” and is meant to help asphalt retain its flexibility and prevent it from cracking over its lifespan.
Pavement Technology has been trialing their titanium dioxide spray alongside Texas A&M University, to whom they’re sending samples of air quality taken alongside road core samples from asphalt treated with their spray.
Early results are promising, and the company claims a one mile-stretch of road treated with their road rejuvenator reduced levels of nitrogen oxide (NOx) by 30% to 40% in the surrounding air, or the equivalent of a 20-acre park.
Titanium dioxide is commonly found in sunscreens, as it’s effective at reflecting sunlight.
Black tarmac and concrete buildings all packed closely together creates the now-infamous urban island heat effect, where the sun heats these surfaces up during the day, and they in turn radiate that heat outward towards everyone and everything, and prevent cities from cooling down in the evening.
Depending on the size, density, and climate in the city, this can raise average daily temperatures by anywhere from 4°F in a city like Adelaide to 14°F in one like Singapore. As a compliment to green spaces and green rooftops which effectively disperse heat, the two could be used in tandem to largely cancel out the urban island heat effect.
Beyond that, the spray replaces maltenes in the road—compounds found in the black oily bitumen component of asphalt, which keeps the roads working for longer.
This not only reduces the emissions needed for road repairs and the heavy machinery they rely on, but also the emissions from traffic slowdowns related to roadwork, a boon which commuters into any metropolitan area can celebrate.
Comments