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Problem statement

There exists a thriving Bronze Age civilization in a gigantic rainforest, bigger than the Amazon and Congo put together. This civilization is built in on the flood plains of a might river system (other questions related here).

Like many other Bronze Age cultures, these people are big on monumental architecture. Unfortunately, there are not a lot of building materials in the rainforest. Sure, there is plenty of wood, but there isn't much stone, and what stone there is must be hauled from thousands of miles away.

I want to build classical Earth's monumental structures, like the mud-brick ziggurats of the Middle East. These structures use fired bricks as the outer surface over a mud brick interior. But, in a land with 2000 mm + per year of rain, these structures would dissolve and wash away in a lifetime.

enter image description here

Question

What materials, available in any rainforest here on Earth, could I use to make bricks? The bricks must be sufficiently durable to last at least thousands of years in a hot humid rainforest, yet sufficiently cheap that a Bronze Age society with a determined priestly/warrior caste could build numerous large temple-palace complexes out of them.

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    $\begingroup$ Why not cut stone like the Inca? $\endgroup$ – Richard Sep 5 '18 at 18:53
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    $\begingroup$ Consider to change your story because you described the exact reason why Ancient Advanced Acropolis in the Jungle(!) stories are dead horse tropes. $\endgroup$ – Thorsten S. Sep 5 '18 at 19:29
  • $\begingroup$ Simple, mud, but the lack of dry direct sunlight makes it hard to cure 'em. $\endgroup$ – Fattie Sep 6 '18 at 1:17
  • $\begingroup$ There are some plants that concentrate silicate materials more than others. This can be recovered in the ashes. $\endgroup$ – KalleMP Sep 6 '18 at 8:14
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    $\begingroup$ Question: where does your civ get their bronze from? Bronze is an alloy of 2 materials that as far as I know are hard to come by in the rainforest. $\endgroup$ – Nzall Sep 6 '18 at 10:52
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You are in the forest. Build of wood. But make it last.

Shou Sugi Ban

charred wood https://criticalconcrete.com/shou-sugi-ban/

It’s a counterintuitive but ingenious idea: heating wood to render it fireproof. If you’ve ever tried to rekindle a campfire using burnt logs, you get the idea. The combustion also neutralizes the cellulose in the wood — the carbohydrates that termites, fungus and bacteria love — making it undesirable to pests and resistant to rot. The resulting charcoal layer repels water and prevents sun damage as well. By some estimates, boards that have undergone this process can last 80 years or more, but Japan’s Buddhist Horyuji Temple in Nara prefecture, whose five-story pagoda is one of the world’s oldest extant wooden structures, has been around for much longer. Initially built in A.D. 607, the pagoda caught fire and was rebuilt in 711 using shou sugi ban. https://www.nytimes.com/2017/09/19/t-magazine/shou-sugi-ban.html

I was thinking about how durable charcoal is. Charcoal can last thousands of years. But it is brittle - how to build a temple from charcoal? The answer: build it of wood coated with charcoal. The outer charcoal layer provides rot and fire resistance. The inner layer provides structural stability.

This is a Japanese technique and I do not think it has been used elsewhere until its recent renaissance. But imagine this for the rainforest. Scale it up. The rainforest has logs - big ones, of some of the best wood in the world. Cut them. Char them so they will last. Build the Temple of Solomon in the rainforest.

Can you make monumental architecture out of logs? You can.

forestry building http://www.offbeatoregon.com/1206c-forestry-building-biggest-log-cabin-burned.html

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    $\begingroup$ Adding a char layer to protect wood is great. This is a thing in the west these days as well. Combining the techniques may add to the benefits. - en.wikipedia.org/wiki/Thermally_modified_wood $\endgroup$ – KalleMP Sep 7 '18 at 17:46
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You can still use firebricks, if you apply a double firing process.

First you bake the clay to make the firebrick, then apply a glassy enamel coating material as waterproofing layer and bake it a second time. Clay can be found in rainforest, as it is the result of the degradation of rocks by means of water (see picture: clay hill in Brazil, made visible by the deforestation)

Clay minerals typically form over long periods of time as a result of the gradual chemical weathering of rocks, usually silicate-bearing, by low concentrations of carbonic acid and other diluted solvents. These solvents, usually acidic, migrate through the weathering rock after leaching through upper weathered layers. In addition to the weathering process, some clay minerals are formed through hydrothermal activity. There are two types of clay deposits: primary and secondary. Primary clays form as residual deposits in soil and remain at the site of formation. Secondary clays are clays that have been transported from their original location by water erosion and deposited in a new sedimentary deposit. Clay deposits are typically associated with very low energy depositional environments such as large lakes and marine basins.

clay hill

The enamel will prevent water from dampening the brick and reducing its performances.

You can use siliceous sands and sodium or potassium carbonates to prepare the enamel, which should not be impossible to find.

Important notice: enamel is rather brittle, so the coated brick must be handled with care to prevent cracking and water infiltration.

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  • $\begingroup$ Can you explain what you use to make the bricks in the first place? Mesopotamian bricks were just mud. I'd like more details on the materials and where you would find it in the rainforest. $\endgroup$ – kingledion Sep 5 '18 at 12:39
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    $\begingroup$ @kingledion, clay, not mud, as it is stated in the text. $\endgroup$ – L.Dutch Sep 5 '18 at 12:50
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    $\begingroup$ This may very much be of interest: youtube.com/watch?v=P73REgj-3UE cracking channel in general. $\endgroup$ – Ynneadwraith Sep 5 '18 at 13:24
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    $\begingroup$ Just to add to this, if you've fired your bricks properly then you don't need an enamelled exterior to protect them. Roman bricks in Britain still exist, in a country famous for its rainfall. For sure the exterior will need repairs over time, but the structure itself will not. $\endgroup$ – Graham Sep 5 '18 at 13:31
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    $\begingroup$ @Aethenosity Possibly, but the UK also has very high humidity all summer. And as Daniel says, the major cause of weathering on all rock-like surfaces is the freeze-thaw cycle, not purely water or humidity. $\endgroup$ – Graham Sep 5 '18 at 17:06
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A good example to use would be the Mayans. Even though their civilization was centered deep in the jungles of Mexico, they were able to build magnificent temples that still stand the test of time, such as Chichen Itza. Even though you said that stone would have to be hauled in from miles away, there is no logical way this could be true on your world, as stone could be found pretty much anywhere if you dig deep enough and take the time to quarry it out of the ground. For example, even though the Mayans were in a jungle where most other types of stone would be hard if not impossible to find, they were able to make use of their limestone deposits, combined with wood and thatch, to build their magnificent cities and temples that still stand to this day. This article does a pretty good job of describing it: https://www.thoughtco.com/mexican-mayan-architecture-178447

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    $\begingroup$ What makes structural stone inaccessible in places like the Amazon basin and the plains bordering the Mississippi isn't that it's a jungle, nor a rain forest (because the Mississippi plains are neither), but rather the combination of two factors: 1) no nearby mountains (the Mayans had some mountains), and 2) being in a frequent and very large flood plain (the Mayans were not). Over hundreds/thousands of years, the floods deposits immense amounts of mud, but very little rock. Great for farming, lousy for building. And these alluvial plains can be very deep. $\endgroup$ – RBarryYoung Sep 6 '18 at 1:06
  • $\begingroup$ @RBarryYoung the Mayans were on the relatively flat Yucatan peninsula. The Aztecs and Incas had mountains, not the Mayans. Besides, the both the Mississippi Valley (mostly the northern half) and the area where the Mayans used to live do have some karst plains rich in limestone. $\endgroup$ – The Weasel Sagas Sep 6 '18 at 1:25
  • $\begingroup$ Adding a char layer to protect wood is great. This is a thing in the west these days as well. Combining the techniques may add to the benefits. - en.wikipedia.org/wiki/Thermally_modified_wood $\endgroup$ – KalleMP Sep 6 '18 at 8:16
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    $\begingroup$ No, the Yucatan peninsula is small, especially compared to the Amazon and Mississippi plains which are over 1000 miles wide at some points. The OP is positing something even bigger. And again, more importantly, 1) there are mountains to provide structural stone in the Yucatan and 2) it is not a flood plain the way that the Amazon and American plains are. $\endgroup$ – RBarryYoung Sep 6 '18 at 13:20
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    $\begingroup$ @KalleMP I believe you commented on the wrong answer. Did you mean Willk's answer above? $\endgroup$ – Orphevs Sep 6 '18 at 21:48
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Cut bricks from local stone, like the Mayans did in their jungle civiliation:

enter image description here

https://www.ancient.eu/Maya_Architecture/

Maya architects used readily available local materials, such as limestone at Palenque and Tikal, sandstone at Quiriguá, and volcanic tuff at Copan. Blocks were cut using stone tools only. Burnt-lime cement was used to create a form of concrete and was occasionally used as mortar, as was simple mud. Exterior surfaces were faced with stucco and decorated with high relief carvings or three-dimensional sculpture. Walls might also have fine veneers of ashlar slabs placed over a rubble core, a feature of buildings in the Puuc region.

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  • $\begingroup$ The premise of the question is that this stone is not practically available. $\endgroup$ – RBarryYoung Sep 6 '18 at 13:24
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    $\begingroup$ @RBarryYoung depends on the definition of "practical". The stone for the pyramids were quarried from miles away and hauled over sand: "Granite for the King's Chamber in Khufu's pyramid was brought over more than 900km from Aswan and white limestone for the outer casing from Tura, a few kilometers south of Giza." cheops-pyramide.ch/khufu-pyramid/stone-quarries.html $\endgroup$ – user151841 Sep 6 '18 at 13:32
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    $\begingroup$ "Miles away", not thousands of miles. And most of the transport distance was covered by barges on the Nile. And there's lots of available exposed structural stone near the Nile, whose lower lengths has a very long but relatively narrow flood plain, unlike the Amazon and the Mississippi. Please keep in mind that the unavailability of structural stone was the premise of the question. When answering questions you shouldn't violate the premise without very good reason, which doesn't exist here because what the OP is positing is perfectly reasonable. $\endgroup$ – RBarryYoung Sep 6 '18 at 13:37
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    $\begingroup$ @RBarryYoung flag the answer. 900 km is ~ 600 miles. If you want the most impressive temple in the land, don't build it out of mud bricks like the local loser chiefs; conspicuously display your wealth with granite from thousands of miles away. $\endgroup$ – user151841 Sep 6 '18 at 13:39
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You can still use mud bricks but:

If you want to build something like this then the culture of the tribe will be built around it

The thing to remember with mud bricks is they are a semi-permanent building material, outside a desert they will wash away within a lifetime. A structure like the Great Mosque of Djenné requires annual maintenance involving the whole community to keep it standing. Without that it would not be many years before it all washed away.

But that's all part of the price to pay for using mud bricks, building a great structure like this from mud bricks is not a one off gathering of the tribe, but a repeating event as often as deemed necessary to maintain the structure. Maintaining the ziggurat is now a fundamental part of your culture.

Of course it's not going to be all that wet

While your culture may have grown out of the rainforest, by the time they're thinking of building this sort of structure they've already headed down the path to large scale land clearance. They already have a culture of building (semi)permanent mudbrick structures. They may even have started farming requiring even greater clearance of land. That clearance of the rainforest will decrease the annual rainfall significantly. If they're lucky that clearance will also give them access to the clay layer (if there is one) to make longer lasting baked clay bricks.

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