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型 號(hào):YC-HSP540D產(chǎn) 地:北京生產(chǎn)廠家:北京儀創(chuàng)時(shí)代科技有限公司用 途:用于測(cè)量混凝土試件在一定環(huán)境條件下,硬化過(guò)程中長(zhǎng)度(體積)發(fā)生變化的專用儀器。
Device name:Upgraded Horizontal Shrinkage Expansion Instrument
Model:YC-HSP540D
Origin:Beijing
Purpose:A special instrument for measuring the change of length (volume) of concrete specimens during hardening under certain environmental conditions.
型號(hào):YC-HSP540D
用途:用于測(cè)量混凝土試件在一定環(huán)境條件下,硬化過(guò)程中長(zhǎng)度(體積)發(fā)生變化的專用儀器,可為建筑科學(xué)研究院所、門、設(shè)計(jì)和施工單位對(duì)砊的特性進(jìn)行研究、教育、質(zhì)量控制和檢測(cè)提供可靠依據(jù)。
執(zhí)行標(biāo)準(zhǔn):
GB/T50082-2009《普通混凝土長(zhǎng)期性能和耐久性能試驗(yàn)方法標(biāo)準(zhǔn)》
現(xiàn)有臥式混凝土收縮膨脹儀存在如下不足:
(1)標(biāo)準(zhǔn)中校準(zhǔn)桿材質(zhì)建議選擇硬鋼或石英玻璃材質(zhì)制作,但目前市場(chǎng)上的校準(zhǔn)桿基本上都為不銹鋼材質(zhì),不銹鋼校準(zhǔn)桿的線膨脹系數(shù)很大,易因溫度波動(dòng)影響造成誤差。
(2)千分表精度差,即使選用業(yè)內(nèi)較好的電子千分表也有±3um的測(cè)量誤差,一般的千分表誤差在±5um以上,這對(duì)于混凝土試件后期收縮量本來(lái)就很小而言,會(huì)造成很大的誤差。
(3)試驗(yàn)過(guò)程人工讀數(shù)記錄,易因人為筆誤或在數(shù)據(jù)抄寫過(guò)程中失誤造成錯(cuò)誤。
并且,由于在整個(gè)試驗(yàn)周期中,同一個(gè)試件要測(cè)量十幾次,上述3種誤差因素會(huì)被不斷放大,很有可能出現(xiàn)前后試驗(yàn)結(jié)果相互矛盾的現(xiàn)象,且無(wú)法找到問(wèn)題根源。
The shortcomings of available horizontal concrete shrinkage expansion meter:
(1) Hard steel or quartz glass is recommended for the calibration rod material in the standard, but the available calibration rod in the market is mostly made of stainless steel. Its linear expansion coefficient is too high, which is easy to cause errors due to the influence of temperature fluctuation.
(2) The accuracy of the micrometer is poor, even if the best electronic micrometer is used, because its measurement error is more than 3um. Generally, the error of the micrometer is more than 5um, which will cause a great error for the shrinkage of concrete specimens in the later period.
(3) Manual reading records during the test process are prone to errors, which is caused by human errors or errors in data transcription.
Moreover, the same specimen needs to be measured more than a dozen times in the whole test cycle. The above error factors will be enlarged continuously, and it is likely that there will be conflicting phenomena between early and later results. We can’t find the root cause of the problem.
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