What is expansion joint?
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ᴀɴ ᴇxᴘᴀɴsɪᴏɴ ᴊᴏɪɴᴛ ᴏʀ ᴍᴏᴠᴇᴍᴇɴᴛ ᴊᴏɪɴᴛ ɪs ᴀɴ ᴀssᴇᴍʙʟʏ ᴅᴇsɪɢɴᴇᴅ ᴛᴏ ʜᴏʟᴅ ᴘᴀʀᴛs ᴛᴏɢᴇᴛʜᴇʀ ᴡʜɪʟᴇ sᴀғᴇʟʏ ᴀʙsᴏʀʙɪɴɢ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ﹣ɪɴᴅᴜᴄᴇᴅ ᴇxᴘᴀɴsɪᴏɴ ᴀɴᴅ ᴄᴏɴᴛʀᴀᴄᴛɪᴏɴ ᴏғ ʙᴜɪʟᴅɪɴɢ ᴍᴀᴛᴇʀɪᴀʟs﹐ ᴀɴᴅ ᴠɪʙʀᴀᴛɪᴏɴ﹐ ᴏʀ ᴛᴏ ᴀʟʟᴏᴡ ᴍᴏᴠᴇᴍᴇɴᴛ ᴅᴜᴇ ᴛᴏ ɢʀᴏᴜɴᴅ sᴇᴛᴛʟᴇᴍᴇɴᴛ ᴏʀ sᴇɪsᴍɪᴄ ᴀᴄᴛɪᴠɪᴛʏ.
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ᴀɴ ᴇxᴘᴀɴsɪᴏɴ ᴊᴏɪɴᴛ ᴏʀ ᴍᴏᴠᴇᴍᴇɴᴛ ᴊᴏɪɴᴛ ɪs ᴀɴ ᴀssᴇᴍʙʟʏ ᴅᴇsɪɢɴᴇᴅ ᴛᴏ ʜᴏʟᴅ ᴘᴀʀᴛs ᴛᴏɢᴇᴛʜᴇʀ ᴡʜɪʟᴇ sᴀғᴇʟʏ ᴀʙsᴏʀʙɪɴɢ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ﹣ɪɴᴅᴜᴄᴇᴅ ᴇxᴘᴀɴsɪᴏɴ ᴀɴᴅ ᴄᴏɴᴛʀᴀᴄᴛɪᴏɴ ᴏғ ʙᴜɪʟᴅɪɴɢ ᴍᴀᴛᴇʀɪᴀʟs﹐ ᴀɴᴅ ᴠɪʙʀᴀᴛɪᴏɴ﹐ ᴏʀ ᴛᴏ ᴀʟʟᴏᴡ ᴍᴏᴠᴇᴍᴇɴᴛ ᴅᴜᴇ ᴛᴏ ɢʀᴏᴜɴᴅ sᴇᴛᴛʟᴇᴍᴇɴᴛ ᴏʀ sᴇɪsᴍɪᴄ ᴀᴄᴛɪᴠɪᴛʏ.
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