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sink</title> <meta name="description" content="Empa researchers believe much CO₂ could be stored in building products by replacing conventional concrete with carbon-based materials." /> <link rel="canonical" href="https://www.rdworldonline.com/concrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles/" /> <meta property="og:locale" content="en_US" /> <meta property="og:type" content="article" /> <meta property="og:title" content="Concrete as a potential carbon sink" /> <meta property="og:description" content="Empa researchers believe much CO₂ could be stored in building products by replacing conventional concrete with carbon-based materials." /> <meta property="og:url" content="https://www.rdworldonline.com/concrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles/" /> <meta property="og:site_name" content="Research & Development World" /> <meta property="article:published_time" content="2025-01-29T02:24:14+00:00" /> <meta property="article:modified_time" 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['concrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles'] ) .setTargeting( 'cat_target', ['defcbbec29391a23dc1361f2e2f74c3e,environment,material-science,ros'] ) .setTargeting( 'contentHash', ['defcbbec29391a23dc1361f2e2f74c3e'] ) .addService( googletag.pubads() ); googletag .defineSlot( '/5272491/rd_network/rdworld_wallpaper', [1, 1], 'div-gpt-rdworld_wallpaper' ) .defineSizeMapping( googletag .sizeMapping() .addSize([991, 0], [1, 1]) .addSize([768, 0], [1, 1]) .addSize([320, 0], [1, 1]) .addSize([0, 0], [1, 1]) .build() ) .setTargeting( 'articletitle', ['concrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles'] ) .setTargeting( 'cat_target', ['defcbbec29391a23dc1361f2e2f74c3e,environment,material-science,ros'] ) .setTargeting( 'contentHash', ['defcbbec29391a23dc1361f2e2f74c3e'] ) .addService( googletag.pubads() ); googletag .defineSlot( '/5272491/rd_network/rdworld_allstreamflex', [1, 1], 'div-gpt-rdworld_allstreamflex' ) .defineSizeMapping( googletag 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) .addService( googletag.pubads() ); googletag .defineSlot( '/5272491/rd_network/rdworld_sidebar1', [[300, 250],[300, 600]], 'div-gpt-rdworld_sidebar1' ) .defineSizeMapping( googletag .sizeMapping() .addSize([991, 0], [[300, 250],[300, 600]]) .addSize([768, 0], [[300, 250],[300, 600]]) .addSize([320, 0], [300, 250]) .addSize([0, 0], [300, 250]) .build() ) .setTargeting( 'articletitle', ['concrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles'] ) .setTargeting( 'cat_target', ['defcbbec29391a23dc1361f2e2f74c3e,environment,material-science,ros'] ) .setTargeting( 'contentHash', ['defcbbec29391a23dc1361f2e2f74c3e'] ) .addService( googletag.pubads() ); googletag .defineSlot( '/5272491/rd_network/rdworld_sidebarbottom', [[300, 250],[300, 600]], 'div-gpt-rdworld_sidebarbottom' ) .defineSizeMapping( googletag .sizeMapping() .addSize([991, 0], [[300, 250],[300, 600]]) .addSize([768, 0], [[300, 250],[300, 600]]) .addSize([320, 0], [300, 250]) .addSize([0, 0], [300, 250]) .build() ) .setTargeting( 'articletitle', ['concrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles'] ) .setTargeting( 'cat_target', ['defcbbec29391a23dc1361f2e2f74c3e,environment,material-science,ros'] ) .setTargeting( 'contentHash', ['defcbbec29391a23dc1361f2e2f74c3e'] ) .addService( googletag.pubads() ); googletag .defineSlot( '/5272491/rd_network/rdworld_prestitial', [[640, 480],[300, 225]], 'gam-holder-prestitial-banner' ) .defineSizeMapping( googletag .sizeMapping() .addSize([991, 0], [640, 480]) .addSize([768, 0], [640, 480]) .addSize([320, 0], [300, 225]) .addSize([0, 0], [300, 225]) .build() ) .setTargeting( 'articletitle', ['concrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles'] ) .setTargeting( 'cat_target', ['defcbbec29391a23dc1361f2e2f74c3e,environment,material-science,ros'] ) .setTargeting( 'contentHash', ['defcbbec29391a23dc1361f2e2f74c3e'] ) .addService( googletag.pubads() ); googletag .defineSlot( '/5272491/rd_network/rdworld_largeleader', [[970, 90],[970, 250]], 'jumbo-banner-ad-container' ) .defineSizeMapping( googletag .sizeMapping() .addSize([991, 0], [[970, 90],[970, 250]]) .addSize([768, 0], [[970, 90],[970, 250]]) .addSize([320, 0], [0, 0]) .addSize([0, 0], [0, 0]) .build() ) .setTargeting( 'articletitle', ['concrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles'] ) .setTargeting( 'cat_target', ['defcbbec29391a23dc1361f2e2f74c3e,environment,material-science,ros'] ) .setTargeting( 'contentHash', ['defcbbec29391a23dc1361f2e2f74c3e'] ) .addService( googletag.pubads() ); // googletag.pubads().enableSingleRequest(); googletag.pubads().collapseEmptyDivs(); googletag.enableServices(); }); </script> <script id="wtwh-uni-gam-content-hash-variables"> var contentHash = "defcbbec29391a23dc1361f2e2f74c3e"; var cat_target = "defcbbec29391a23dc1361f2e2f74c3e,environment,material-science,ros"; </script> </head> <body class="post-template-default single single-post postid-76672 single-format-standard 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Ambitious goals, significant hurdles"><header class="entry-header"><h1 class="entry-title">Concrete as a potential carbon sink: Ambitious goals, significant hurdles</h1> <p class="entry-meta"><span class="entry-author">By <a href="https://www.rdworldonline.com/author/hhall/" class="entry-author-link" rel="author"><span class="entry-author-name">Heather Hall</span></a></span> | <time class="entry-time">January 28, 2025</time></p></header><div class="entry-content"><div class="addtoany_share_save_container addtoany_content addtoany_content_top"><div class="a2a_kit a2a_kit_size_16 addtoany_list" data-a2a-url="https://www.rdworldonline.com/concrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles/" data-a2a-title="Concrete as a potential carbon sink: Ambitious goals, significant hurdles"><a class="a2a_button_facebook" href="https://www.addtoany.com/add_to/facebook?linkurl=https%3A%2F%2Fwww.rdworldonline.com%2Fconcrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles%2F&linkname=Concrete%20as%20a%20potential%20carbon%20sink%3A%20Ambitious%20goals%2C%20significant%20hurdles" title="Facebook" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_x" href="https://www.addtoany.com/add_to/x?linkurl=https%3A%2F%2Fwww.rdworldonline.com%2Fconcrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles%2F&linkname=Concrete%20as%20a%20potential%20carbon%20sink%3A%20Ambitious%20goals%2C%20significant%20hurdles" title="X" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_linkedin" href="https://www.addtoany.com/add_to/linkedin?linkurl=https%3A%2F%2Fwww.rdworldonline.com%2Fconcrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles%2F&linkname=Concrete%20as%20a%20potential%20carbon%20sink%3A%20Ambitious%20goals%2C%20significant%20hurdles" title="LinkedIn" rel="nofollow noopener" target="_blank"></a><a class="a2a_button_email" href="https://www.addtoany.com/add_to/email?linkurl=https%3A%2F%2Fwww.rdworldonline.com%2Fconcrete-as-a-potential-carbon-sink-ambitious-goals-significant-hurdles%2F&linkname=Concrete%20as%20a%20potential%20carbon%20sink%3A%20Ambitious%20goals%2C%20significant%20hurdles" title="Email" rel="nofollow noopener" target="_blank"></a><a class="a2a_dd addtoany_share_save addtoany_share" href="https://www.addtoany.com/share"></a></div></div><p>By replacing conventional concrete aggregates with carbon-based materials, scientists at <a href="https://www.empa.ch/" target="_blank" rel="noopener">Empa</a> believe large amounts of CO₂ could be permanently stored in building products. Their concept, “Mining the Atmosphere,” aims to help reduce atmospheric CO₂ levels to 350 parts per million — roughly the 1988 benchmark.</p> <div id="attachment_76673" style="width: 387px" class="wp-caption alignright"><a href="https://www.rdworldonline.com/wp-content/uploads/2025/01/CO2.jpeg"><img decoding="async" aria-describedby="caption-attachment-76673" class=" wp-image-76673" src="https://www.rdworldonline.com/wp-content/uploads/2025/01/CO2-300x200.jpeg" alt="" width="377" height="251" srcset="https://www.rdworldonline.com/wp-content/uploads/2025/01/CO2-300x200.jpeg 300w, https://www.rdworldonline.com/wp-content/uploads/2025/01/CO2-768x512.jpeg 768w, https://www.rdworldonline.com/wp-content/uploads/2025/01/CO2-357x238.jpeg 357w, https://www.rdworldonline.com/wp-content/uploads/2025/01/CO2.jpeg 770w" sizes="(max-width: 377px) 100vw, 377px" /></a><p id="caption-attachment-76673" class="wp-caption-text"><em>Concrete could store considerable amounts of CO2 if conventional aggregates were replaced by pellets made from biochar. Credit: Empa</em></p></div> <p>To remove CO₂ from the atmosphere is “a very energy-intensive endeavor,” noted <strong>Pietro Lura</strong>, head of Empa’s Concrete and Asphalt laboratory, in <a href="https://www.newswise.com/articles/concrete-as-a-carbon-store">a press release</a>. “These calculations are based on the assumption that sufficient renewable energy will be available after 2050 to remove CO₂ from the atmosphere.” Despite uncertainty about that assumption, Empa’s projections suggest that vast volumes of CO₂ could be converted into methane or methanol, then further processed into carbon-rich materials such as polymers, silicon carbide, or biochar.</p> <p><strong>Key Components of the Strategy</strong></p> <ul> <li><strong>Concrete as a </strong><strong>storage </strong><strong>medium</strong>: With its global prevalence, concrete might absorb enormous quantities of carbon. “It remains a challenge how quickly and efficiently carbon can be introduced into these materials without deteriorating their properties,” Lura said.</li> <li><strong>Replacing </strong><strong>high-</strong><strong>emission </strong><strong>materials</strong>: Conventional CO₂-emitting building resources could be phased out using carbon-enriched substitutes. Lura explains, “Carbon must be incorporated into stable materials, as direct storage can be dangerous — due to the risk of fire.”</li> <li><strong>Silicon </strong><strong>carbide’s </strong><strong>role</strong>: This compound, used as a potential filler, is extremely energy-intensive but binds carbon “practically forever” and strengthens concrete. Its cost and sustainability remain open questions.</li> </ul> <p><strong>Possible Timeline</strong><br /> Under optimistic scenarios, up to ten gigatons of carbon per year could be captured in building materials by 2050 — once renewable energy becomes widely available. The surplus carbon, around 400 gigatons, plus an extra 80 gigatons from unavoidable emissions, might be stored within 50 to 150 years. “Nevertheless, the aim should be to remove as much CO₂ as possible from the atmosphere each year,” Lura said, adding that emissions must still be reduced to make any removal effort worthwhile.</p> <p><strong>Practical </strong><strong>obstacles</strong><br /> Even with sufficient renewables, the approach demands progress in materials research, process development, and economic incentives. It is not enough to reduce greenhouse gas emissions to achieve climate targets, Empa’s researchers note. They also see potential in transporting synthetic methane — a byproduct of carbon conversion — from sun-rich regions to those needing extra energy in winter. However, the success of “Mining the Atmosphere” hinges on how efficiently carbon can be captured, processed, and integrated into long-lived building materials at scale.</p> <p>While critics may see these targets as overly ambitious, proponents argue that combining carbon capture with durable building applications offers a path forward. As Lura stated, “At the same time, it is crucial to continuously minimize our emissions so that the recovery process is not in vain.”</p> </div><footer class="entry-footer"></footer></article><div class="related-articles"><h4 class="block-header">Related Articles <a href="https://www.rdworldonline.com/topics/environment/">Read More ></a></h4><div class="article-listing"><div class="row"><article class="entry-summary"><a href="https://www.rdworldonline.com/7-major-rd-moves-this-week-honda-and-nissan-end-merger-talks-baidu-to-launch-driver-less-taxis-in-uae-chevron-is-moving/" class="entry-image-link"></a><h5 class="entry-title"><a href="https://www.rdworldonline.com/7-major-rd-moves-this-week-honda-and-nissan-end-merger-talks-baidu-to-launch-driver-less-taxis-in-uae-chevron-is-moving/">7 major R&D moves this week: Honda and Nissan end merger talks, Baidu to launch driver-less taxis in UAE, Chevron is moving</a></h5></article><article class="entry-summary"><a href="https://www.rdworldonline.com/new-ai-tool-aims-to-improve-building-material-assessment/" class="entry-image-link"><img width="268" height="170" src="https://www.rdworldonline.com/wp-content/uploads/2025/02/urban-planning2-268x170.jpg" class="attachment-ea_summary size-ea_summary wp-image-77010 wp-post-image" alt="" decoding="async" /></a><h5 class="entry-title"><a href="https://www.rdworldonline.com/new-ai-tool-aims-to-improve-building-material-assessment/">New AI tool aims to improve building material assessment, potentially transforming urban sustainability</a></h5></article><article class="entry-summary"><a href="https://www.rdworldonline.com/berelex-green-eco-friendly-antiviral-antifungal-and-antibacterial-paint/" class="entry-image-link"></a><h5 class="entry-title"><a href="https://www.rdworldonline.com/berelex-green-eco-friendly-antiviral-antifungal-and-antibacterial-paint/">R&D 100 winner of the day: Berelex Green eco-friendly, antiviral, antifungal, and antibacterial paint</a></h5></article><article class="entry-summary"><a href="https://www.rdworldonline.com/flashlight-sized-device-boosts-coral-feeding-up-to-50x/" class="entry-image-link"><img width="268" height="170" src="https://www.rdworldonline.com/wp-content/uploads/2025/02/lom310669-fig-0001-m-268x170.jpg" class="attachment-ea_summary size-ea_summary wp-image-76834 wp-post-image" alt="" decoding="async" loading="lazy" /></a><h5 class="entry-title"><a href="https://www.rdworldonline.com/flashlight-sized-device-boosts-coral-feeding-up-to-50x/">Flashlight-sized device boosts coral feeding up to 50x</a></h5></article></div></div></div></main><aside class="sidebar sidebar-primary widget-area" role="complementary" aria-label="Primary Sidebar"><section id="custom_html-11" class="widget_text widget widget_custom_html"><div class="widget_text widget-wrap"><div class="textwidget custom-html-widget"><center> <div style="display: flex; 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