tag:blogger.com,1999:blog-1228690739485734684.post5729262558669129577..comments2024-03-28T22:13:17.139+00:00Comments on Stonehenge and the Ice Age: Corbelled chambersBRIAN JOHNhttp://www.blogger.com/profile/00413447032454568083noreply@blogger.comBlogger15125tag:blogger.com,1999:blog-1228690739485734684.post-71309814986717938912014-05-05T08:14:16.209+01:002014-05-05T08:14:16.209+01:00Hydraulic lime is a variety of lime, a slaked lime...<i>Hydraulic lime is a variety of lime, a slaked lime used to make lime mortar.</i><br /><br />Again, this is not entirely accurate. Another variety of lime mortar uses non-hydraulic lime. It has a slower setting time, relying on the carbonation process to set.<br /><br />Traditionally, non-hydraulic limes were used in construction (typically as a putty which was combined with other materials such as horse-hair).<br />Jon Morrishttps://www.blogger.com/profile/11264966739582178631noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-11560300353790145142014-05-03T10:25:35.186+01:002014-05-03T10:25:35.186+01:00Anon -- thanks for the info. I don't like Anon...Anon -- thanks for the info. I don't like Anonymous entries -- if you send in any other comments, please add your name in the message, as Pete G does. You should still be able to use the "Anonymous" button if you don't want to go through the rigmarole of signing up or signing in -- not sure how these things work on other people's computers.....BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-81606626052708128092014-04-29T17:48:05.298+01:002014-04-29T17:48:05.298+01:00Hydraulic lime is a variety of lime, a slaked lime...Hydraulic lime is a variety of lime, a slaked lime used to make lime mortar. Hydraulicity is the ability of lime to set under water. Hydraulic lime is produced by heating calcining limestone that contains clay and other impurities. Calcium reacts in the kiln with the clay minerals to produce silicates that enable the lime to set without exposure to air. Any unreacted calcium is slaked to calcium hydroxide. Hydraulic lime is used for providing a faster initial set than ordinary lime in more extreme conditions (including under water).Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-11513936662999286452014-04-28T18:25:47.160+01:002014-04-28T18:25:47.160+01:00Thanks Jon. Very true -- I try to keep the discus...Thanks Jon. Very true -- I try to keep the discussions honest and open, but sometimes one slips through when I'm not concentrating....BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-19229613516295240912014-04-28T18:23:03.366+01:002014-04-28T18:23:03.366+01:00Lime mortar is made from crushed limestone not cha...<i>Lime mortar is made from crushed limestone not chalk. <br /><br />Wrong. Lime is made from chalk or limestone:</i><br /><br />http://en.wikipedia.org/wiki/Lime_%28material%29<br /><br />I thought you weren't taking these anonymous comments Brian? Jon Morrishttps://www.blogger.com/profile/11264966739582178631noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-91212995597189224812014-04-28T12:28:26.435+01:002014-04-28T12:28:26.435+01:00Lime mortar is made from crushed limestone not cha...Lime mortar is made from crushed limestone not chalk. Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-4390734330835137742014-04-28T00:05:38.838+01:002014-04-28T00:05:38.838+01:00Jon,
I appreciate the lesson. ”So lime mortar is ...Jon,<br /><br />I appreciate the lesson. <i>”So lime mortar is effectively chalk”</i>. Can “lime mortar” naturally form? A recent discussion prompted this question.<br /><br />KostasConstantinos Ragazasnoreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-81207382410985623822014-04-27T20:02:46.655+01:002014-04-27T20:02:46.655+01:00Lime is made by 'burning' crushed chalk (a...Lime is made by 'burning' crushed chalk (and some other natural materials) Costas. When chalk (the mineral calcite) is burnt it produces calcium oxide. This forms a mortar with low strength and a long setting period (adding water produces calcium hydroxide). This mortar gradually reverts by the process of carbonation (or sometimes called carbon sequestration). This sequestration produces calcite: Chalk.<br /><br />So lime mortar is effectively chalk. This is why it is self-healing.<br /><br />Jon Morrishttps://www.blogger.com/profile/11264966739582178631noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-77718245555185816112014-04-27T14:23:10.184+01:002014-04-27T14:23:10.184+01:00Jon,
This is very interesting! Thanks for that in...Jon,<br /><br />This is very interesting! Thanks for that information re: “lime mortar”. <br /><br />Which raises this question. Chalk being essentially limestone can “lime mortar” be made with chalk? Perhaps mixing ground up chalk with mud or clay or gravel, forming a “putty-like” substance?<br /><br />KostasConstantinos Ragazasnoreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-17748298706431049432014-04-27T08:41:39.256+01:002014-04-27T08:41:39.256+01:00Lime mortar is a traditional material but, importa...Lime mortar is a traditional material but, importantly, allows a much larger degree of settlement (by comparison to modern Portland cements) without adverse structural effect. The reason for this is that lime cracks are 'self healed' by water flow. This is very important for longevity in the type of construction that Tim is trying to achieve.Jon Morrishttps://www.blogger.com/profile/11264966739582178631noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-20672577415322013482014-04-26T20:38:27.414+01:002014-04-26T20:38:27.414+01:00Sorry for the mistake, Tim. Three cheers for lime...Sorry for the mistake, Tim. Three cheers for lime mortar!BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-78488125482810812672014-04-26T18:49:08.657+01:002014-04-26T18:49:08.657+01:00Thanks Brian for the kind words. That is the small...Thanks Brian for the kind words. That is the smallest chamber roof, we are starting on the first large corbelled roof next week. And I must point out, as the stonemason is very passionate about it, that it is lime mortar he is mainly using. Tim Dawhttps://www.blogger.com/profile/10667360714222841797noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-47818067785558795772014-04-26T16:58:11.140+01:002014-04-26T16:58:11.140+01:00oops -- should be "chambers"......oops -- should be "chambers"......<br />BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-33879825764850033552014-04-26T16:46:03.654+01:002014-04-26T16:46:03.654+01:00Not even I would claim that these cambers are made...Not even I would claim that these cambers are made by glaciers! I find them rather impressive..... but as for that "alcove" it's a complete red herring......BRIAN JOHNhttps://www.blogger.com/profile/00413447032454568083noreply@blogger.comtag:blogger.com,1999:blog-1228690739485734684.post-85127249474570700052014-04-26T15:35:00.376+01:002014-04-26T15:35:00.376+01:00There's no argument about these man-made corbe...There's no argument about these man-made corbelled chambers. <br />The so-called Rhosyfellin "alcoves" seem to be much harder to see (your Post, April 10th).TonyHnoreply@blogger.com