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玻化微珠保温砂浆含湿率试验与分析结果

时间:2016-07-18     作者:www。hdbwsj。com【原创】   阅读

一、质量平衡含湿率试验

One, the mass balance moisture rate test

根据刚才的玻化微珠保温砂浆自然状态吸放湿试验结论,试块的吸放湿受环境变化波动的影响。为进一步观察环境湿度波动对玻化微珠保温砂浆含水率变化的影响,更精确了解玻化微珠保温砂浆的吸放湿性能,为测定试件受潮后导热系数提供更充分依据,质量平衡含湿率试验应用风洞实验台构建稳定的温湿度环境进行吸放湿性能的测定,取得其在某特定温度,不同湿度条件下的质量平衡含湿率,观察分析试件吸湿放湿过程。

According to just vitrified beads insulation mortar nature put wet absorption test conclusion, wet absorption and release block being affected by the fluctuation of the environmental changes. In order to further observe the environment humidity fluctuations of vitrified microsphere, changes in the moisture content of insulation mortar, more accurate understanding of vitrified beads insulation mortar put wet absorption performance, for the determination of specimens after be affected with damp be affected with damp coefficient of thermal conductivity to provide better basis, mass balance moisture rate test application of wind tunnel test bench build stable temperature and humidity environment to determine the put wet absorption performance, achieve in a certain temperature, the mass of the humidity balance moisture rate, analyze the specimen hygroscopic put wet process.

二、试验装置和仪器

Second, the test apparatus and instruments

实验在华南理工大学亚热带建筑科学国家重点实验室经国家计量认证(CMA)的热湿气候风洞实验台(2008002969K)完成。实验台试块测试槽及精密电子天平,环境控制参数。考虑到风速对实验材料吸放湿效果影响较大,并尽可能使风洞内热环境接近实际,根据《采暖通风与空气调节设计规范》(GBJ

Experiments in south China university of technology, authorized by the state key laboratory of subtropical architecture science national metrology accreditation (CMA) hot wet climate of wind tunnel test bench (2008002969 k). Test bench test block, groove and precision electronic balance, environmental control parameters. Considering the wind speed had a greater influence on the material put wet absorption effect of the experiment, and the best close to actual wind tunnel and internal environment, according to the specification for design of heating ventilating and air conditioning (GBJ

50019—2003),对应南方城市室外夏季平均风速,构建了风洞的逐时刻风速分布。

50019-2003), corresponding to the southern city of outdoor summer average wind speed, wind tunnel is constructed by moment of wind speed distribution.

三、试验方法及内容

Third, test method and content

根据规范要求并结合风洞实验台的模拟范围,测试构建的温、湿度条件是:温度恒定为25℃,分别测定试块在相对湿度为45%、55%、65%、75%、85%的环境下试块的质量平衡含湿率。试块质量通过精度为0.01

According to the specification requirements and combined with the simulation range of wind tunnel test bench, the construct of the test of temperature and humidity conditions are: constant temperature of 25 ℃, were determined in the block, relative humidity is 45%, 55%, 65%, 75% and 85% of the block under the environment of mass balance moisture rate. Block quality through precision is 0.01

g的电子天平系统自动记录,当试块的质量每间隔24 h的连续3次测量结果的变化小于总质量的0.1%,即认为达到了恒重状态。

G electronic balance automatically record, when the quality of the block, 24 h intervals of 3 consecutive measurements of less than 0.1% of the total quality of change, that reach a state of constant weight.

根据风洞实验台测试试件的要求,将玻化微珠保温砂浆制成尺寸为100 mm×100 mmX 50

According to the requirements of wind tunnel test bench test specimen will be vitrified beads insulation mortar made size is 100 mm x 100 mmX 50

mm的标准试块,按《建筑材料及制品的湿热性能吸湿性能的测定》(GB/T 20312—2006/ISO

Mm standard block, according to the building materials and products of hot and humid the determination of moisture absorption performance "(GB/T 20312-2006 / ISO

12571:2000)的测定步骤,在干燥温度为105士1℃的干燥箱内干燥达到恒重后,置于风洞实验槽中,从相对湿度为45%开始逐级增加湿度,分别测定每个湿度环境下材料达到湿平衡时的质量m,求出平衡含湿量。每一级相对湿度达到平衡的时间为7~10

, 12571:2000) determination of the steps in the drying temperature is 105 and 1 ℃ in the drying oven drying to constant weight, placed in the slot in the wind tunnel experiment, starting from the relative humidity is 45% step by step to increase humidity, humidity, respectively each balanced wet material quality m, and the equilibrium moisture content. Each level of relative humidity balance time is 7 ~ 10

d。当试块在相对湿度为85%达到湿平衡后,开始逐级降低湿度,分别测定每个湿度环境下材料达到湿平衡时的质量m,求出放湿过程的平衡含湿量。

D。 When the block in the relative humidity is 85% after reaching moisture balance, start step by step to reduce the humidity, humidity, respectively each balanced wet material quality m, and the equilibrium moisture content of the wet release process。

四、实验结果与分析

Fourth, the experimental results and analysis

从2012年6月12日一9月16日,经过3个多月的测试,测试了试块的等温吸放湿过程,求出每个湿度条件下的平衡含湿率u,得到试件在25℃时的吸放湿曲线,可以看出,试块的等温吸放湿

From June 12, 2012, on September 16, after more than three months of testing, testing the isothermal block put wet absorption process, the balance of each humidity moisture rate u, get the specimen at 25 ℃ put wet absorption curve, it can be seen that the isothermal block, put wet absorption

过程并非完全可逆过程。测量范围内平衡放湿曲线斜率明显小于吸湿曲线,说明随着空气相对湿度下降,试块内部所含水分在短时间内并不能完全排出。

The process is not completely reversible process. Measuring range balance put wet curve slope is lower moisture absorption curve, explain with the air relative humidity decreased, block the internal moisture content not completely in a short time.

南方地区潮湿多雨气候条件,相对湿度多在60%~90%之间,致使玻化微珠保温砂浆频繁受潮,其中水分并无足够时间排出,因此玻化微珠保温砂浆内湿度变化曲线应更接近于平衡放湿曲线,始终保持在较高水平,十分有必要进行玻化微珠保温砂浆受潮后导热系数的变化。

Southern humid and rainy climate condition, relative humidity between 60% ~ 90%, the vitrified beads insulation mortar is frequent be affected with damp be affected with damp, moisture content, there is no enough time to discharge, therefore vitrified beads insulation mortar humidity change within the curve should be more put wet curve close to balance, always stay at a higher level, is very necessary for vitrified microsphere, the changes of the coefficient of thermal conductivity of the insulation mortar be affected with damp be affected with damp.

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