一、全自動凍融試驗箱概述：
全自動凍融試驗箱是混凝土檢測儀器，適用于混凝土、建筑磚塊、陶瓷磚、外墻砂漿及其它建材的凍融試驗，制冷壓縮機采用法國泰康節(jié)能、環(huán)保型渦旋式低溫壓縮機組，風(fēng)機為無極調(diào)速，可根據(jù)環(huán)度可根據(jù)環(huán)境溫度從而改變風(fēng)機的轉(zhuǎn)速。 整體性能穩(wěn)定，全自動凍融試驗箱采用優(yōu)質(zhì)不銹鋼板，一體式結(jié)構(gòu)，操作簡單方便。
I. Overview of full-automatic freeze-thaw test chamber:
Full-automatic freeze-thaw test box is a concrete testing instrument, which is suitable for freeze-thaw test of concrete, building bricks, ceramic tiles, exterior wall mortar and other building materials. The refrigeration compressor uses the energy-saving and environmentally-friendly scroll type imported from Taikang, France. For low-temperature compressors, the fan is steplessly adjustable, and the speed of the fan can be changed according to the ring degree and the ambient temperature. The overall performance is stable. The full-automatic freeze-thaw test box uses high-quality stainless steel plates with an integrated structure, which is simple and convenient to operate.
二、全自動凍融試驗箱符合標(biāo)準(zhǔn)：
GB/T3810-2006陶瓷磚抗凍性試驗方法
GB/T2542-2003砌墻磚試驗方法
GB/T4111-1997混凝土小型空心砌塊試驗方法
GB/T11973-1997加氣混凝土抗凍性試驗方法
JGJ/T70-2009砂漿抗凍性能試驗方法
GB/T11973-2006蒸汽加氣混凝土砌塊試驗方法
GB/T11968-2006混凝土小型空心砌塊試驗方法
GB/T241-1994巖石抗凍性試驗方法
Second, the fully automatic freeze-thaw test box meets the standards:
GB / T3810-2006 Test method for frost resistance of ceramic tiles
GB / T2542-2003 Test method for masonry bricks
GB / T4111-1997 Test method for small concrete hollow blocks
GB / T11973-1997 Test method for frost resistance of aerated concrete
JGJ / T70-2009 Test method for frost resistance of mortar
GB / T11973-2006 Test method for steam aerated concrete blocks
GB / T11968-2006 Test method for small concrete hollow blocks
GB / T241-1994 Test method for frost resistance of rocks
三、全自動陶瓷磚凍融試驗箱產(chǎn)品特點：
壓縮機、加熱部分、電源控制部分均采用進(jìn)口件，高質(zhì)量、高性能
滿載運轉(zhuǎn)時凍融箱內(nèi)各點溫度極差不超過2℃
儀表自動控制，數(shù)據(jù)曲線實時動態(tài)顯示、試驗數(shù)據(jù)自動存儲，具有試驗意外終斷自動恢復(fù)功能
安裝方便，占地小，低噪音
Third, the automatic ceramic tile freeze-thaw test box product features:
The compressor, heating part and power control part are all imported parts, with high quality and high performance.
The temperature difference between each point in the freeze-thaw box is not more than 2 ℃ during full load operation.
Instrument automatic control, real-time dynamic display of data curve, automatic storage of test data, and automatic recovery of unexpected test termination
Easy installation, small footprint, low noise
四、全自動凍融試驗箱技術(shù)參數(shù)：
冷凝器冷卻方式 | 風(fēng)冷 | 風(fēng)冷 |
試件數(shù)量 | 16件 | 28件 |
試件尺寸 | 100×100×400，測溫件尺寸相同，中間留有測溫孔 | |
凍融循環(huán)周期 | 2.5～4小時，融化時間不小于1∕4凍融周期 | |
傳感器1：中溫度控制 | 5～-18±2℃ | |
傳感器2：液體溫度控制 | 液體溫度控制高溫控制：18～23℃ 低溫控制：-23～-18℃ | |
傳感器3：對角線溫度控制 | 對角線溫度監(jiān)測箱體內(nèi)溫度極差不超過2℃ | |
傳感器4：二次保護(hù)溫度控制 | 50℃～-30℃ | |
溫度記錄儀 | 數(shù)字顯示無紙記錄儀 | |
試件桶尺寸 | 120×120×500 | |
凍融循環(huán)介質(zhì) | －45℃防凍液 | |
凍融循環(huán)介質(zhì)充注量 | 液面高于試塊10－15毫米 | |
制冷機壓縮機 | 全封閉 4HP | 全封閉5HP |
加熱功率 | 5kW | 6kW |
zui大運行功率 | 6kW | 7kW |
供電 | 3N380V 50Hz | 3N380V 50Hz |
外形尺寸 | 1900×800×1100 | 1900×1300×1100 |
重量 | 約400kg | 約500kg |
五、全自動凍融試驗箱使用方法：
試驗采用水凍水融法,把符合外觀要求的100×100×400的混凝土試件和測溫試件放進(jìn)試件桶中,用17~23℃的水浸泡4天，然后把試件桶放入凍融試驗槽中，用循環(huán)的冷凍液對試件反復(fù)進(jìn)行降溫和升溫，周期性地把試件內(nèi)放的水進(jìn)行凍結(jié)和融化。混凝土試件每做25次凍融循環(huán)試驗，都要測量1次重量和相對動彈性模量。當(dāng)相對動彈性模量下降至初始值的60％或質(zhì)量損失率達(dá)5％時，即認(rèn)為試件已達(dá)破壞，并以相應(yīng)的凍融循環(huán)次數(shù)作為該混凝土的抗凍等級。如果試件凍融至預(yù)定的循環(huán)次數(shù)，而相對動彈性模量或質(zhì)量損失率均未達(dá)到上述指標(biāo)，可認(rèn)為試驗的混凝土抗凍性已滿足設(shè)計要求。根據(jù)凍融循環(huán)次數(shù)及相應(yīng)的相對動彈性模量可計算出混凝土耐久性系數(shù)，供設(shè)計選材時參考。因此，在動彈性模量，質(zhì)量損失率和耐久性系數(shù)為評定指標(biāo)的混凝土抗凍試驗中。
Fifth, the use of automatic freeze-thaw test box:
The test adopts the water-freeze-thaw method, put the 100 × 100 × 400 concrete test pieces and temperature test pieces that meet the appearance requirements into the test piece bucket, soak it in water at 17 ~ 23 ℃ for 4 days, and then put the test piece bucket Put it into the freezing and thawing test tank, use the circulating freezing liquid to repeatedly reduce the temperature and increase the temperature of the test piece, and periodically freeze and thaw the water in the test piece. For every 25 freeze-thaw cycle tests on concrete specimens, the weight and relative dynamic elastic modulus must be measured once. When the relative dynamic elastic modulus drops to 60% of the initial value or the mass loss rate reaches 5%, it is considered that the test piece has reached damage, and the corresponding freeze-thaw cycle number is used as the freeze resistance level of the concrete. If the test piece is frozen and thawed to a predetermined number of cycles, and the relative dynamic elastic modulus or mass loss rate does not reach the above indicators, the frost resistance of the tested concrete can be considered to have met the design requirements. The durability coefficient of concrete can be calculated according to the number of freeze-thaw cycles and the corresponding relative dynamic elastic modulus for reference when designing and selecting materials. Therefore, in the concrete frost resistance test in which the dynamic elastic modulus, mass loss rate and durability coefficient are evaluated.
