<story><title>Rubber concrete that self-seals and is cheaper and more environmentally friendly</title><url>https://newatlas.com/materials/rubbery-crack-resistant-cement/</url></story><parent_chain></parent_chain><comment><author>qndreoi</author><text>Rubber is a latex or elastomer, not the substance described here. The original article used rubbery in the title, an adjective that means tough and elastic. Better not to have been changed.</text></comment>
<story><title>Rubber concrete that self-seals and is cheaper and more environmentally friendly</title><url>https://newatlas.com/materials/rubbery-crack-resistant-cement/</url></story><parent_chain></parent_chain><comment><author>pmoriarty</author><text>Another interesting material is Papercrete.[1]&lt;p&gt;&lt;i&gt;&amp;quot;Papercrete gets its name from the fact that most formulas use a mixture of water and cement with cellulose fiber. The fiber is usually acquired from recycled newspaper, lottery tickets and phone books. The mixture has the appearance and texture of oatmeal and is poured into forms and dried in the sun, much like the process for making adobe.&lt;/i&gt;&lt;p&gt;&lt;i&gt;&amp;quot;Dried papercrete has very low strength, but fails by slow compression (due to the large air content and hence compressibility) rather than in a brittle manner. Concrete
and wood (though dry soft wood can be as high as R-2 per inch, high moisture content reduces this value markedly.) are not known for their insulating qualities; however,
papercrete also provides good insulation...&lt;/i&gt;&lt;p&gt;&lt;i&gt;&amp;quot;Unlike concrete or adobe, papercrete blocks are lightweight, less than a third of the weight of a comparably-sized adobe brick. Papercrete is mold resistant and has utility as a sound-proofing material.&amp;quot;&lt;/i&gt;&lt;p&gt;[1] - &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Papercrete&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;Papercrete&lt;/a&gt;</text></comment>