【摘要】：在混凝土中摻入相變材料制備出相變混凝土,以其能夠改善混凝土蓄熱性能,提高能源利用率,減少建筑能量消耗等特點(diǎn),受到越來越多的關(guān)注。但相變混凝土也存在強(qiáng)度較低,相變循環(huán)穩(wěn)定性等問題。本文將硬脂酸丁酯,用活性炭吸附后,制成活性炭?jī)?chǔ)能骨料,再將該骨料摻入混凝土中,以制備出相變混凝土。對(duì)不同相變循環(huán)次數(shù)下(0次、30次、60次),不同活性炭?jī)?chǔ)能骨料摻量(0%、10%、15%、20%、25%)的相變混凝土進(jìn)行了基本力學(xué)性能、導(dǎo)熱系數(shù)、儲(chǔ)放熱和相變循環(huán)穩(wěn)定性試驗(yàn),并對(duì)試驗(yàn)結(jié)果進(jìn)行了分析,以其制備出一種相變循環(huán)穩(wěn)定,具有良好保溫儲(chǔ)熱能力,同時(shí)力學(xué)性能滿足要求的新型混凝土材料�；玖W(xué)性能試驗(yàn)表明:增加活性炭?jī)?chǔ)能骨料的摻量,將導(dǎo)致相變混凝土的力學(xué)性能大幅降低,但當(dāng)摻量不大于15%時(shí),相變混凝土的壓拉強(qiáng)度下降不超過10%,抗折強(qiáng)度下降不超過13%。相變混凝土基本力學(xué)性能受溫度影響很小,室溫30℃C和10℃C下,相變混凝土壓拉強(qiáng)度相差小于2%,抗折強(qiáng)度相差小于4%。試塊斷裂面顯示,活性炭?jī)?chǔ)能骨料在混凝土中分布均勻,且封裝良好,但其與混凝土的粘結(jié)性較差,影響了混凝土的力學(xué)性能。導(dǎo)熱系數(shù)試驗(yàn)表明:相變混凝土的導(dǎo)熱系數(shù),隨著活性炭?jī)?chǔ)能骨料摻量的增加而大幅上升。當(dāng)摻量超過15%時(shí),導(dǎo)熱系數(shù)增加超過25%,要保證保溫能力,活性炭?jī)?chǔ)能骨料的摻量應(yīng)小于15%。室溫越高,相變混凝土導(dǎo)熱系數(shù)越高,活性炭?jī)?chǔ)能骨料摻量為15%的相變混凝土,在室溫30℃C時(shí)的導(dǎo)熱系數(shù)和10℃C時(shí)相差小于4%。儲(chǔ)放熱試驗(yàn)表明:通過內(nèi)部相變材料的融化和凝固,相變混凝土能夠儲(chǔ)存和釋放熱量,其儲(chǔ)放熱能力隨著活性炭?jī)?chǔ)能骨料摻量的增加而增強(qiáng)。活性炭?jī)?chǔ)能骨料摻量為15%時(shí),可使邊長(zhǎng)100min的立方體試塊,中心溫度波動(dòng)幅度減小1℃C左右。在溫度高于相變材料熔點(diǎn)時(shí),相變混凝土表面會(huì)因相變材料融化形成斑點(diǎn)狀油漬,油漬不會(huì)因相變材料凝固而消失,且油漬數(shù)量和活性炭?jī)?chǔ)能骨料摻量成正相關(guān)。相變循環(huán)試驗(yàn)表明:活性炭?jī)?chǔ)能骨料性質(zhì)穩(wěn)定,在相變循環(huán)過程中理化性質(zhì)未發(fā)生變化,其對(duì)相變混凝土的基本力學(xué)性能和導(dǎo)熱性能的影響未隨相變循環(huán)發(fā)生明顯改變。相變混凝土的相變循環(huán)穩(wěn)定性良好,相變混凝土在相變循環(huán)后由于水份蒸發(fā)會(huì)出現(xiàn)密度和導(dǎo)熱系數(shù)的降低,且隨著相變循環(huán)次數(shù)的增加,降低幅度變緩并趨于穩(wěn)定。去除齡期的影響,相變混凝土基本力學(xué)性能在相變過程中未發(fā)生明顯變化,相變循環(huán)60次后,基本力學(xué)性能變化幅度小于4%。
[Abstract]:Phase change concrete is prepared by adding phase change materials into concrete, which has attracted more and more attention because of its ability to improve the heat storage performance of concrete, improve the energy utilization rate and reduce the energy consumption of buildings. However, the phase change concrete also has some problems, such as low strength, phase transition cycle stability and so on. In this paper, Butyl stearate was adsorbed with activated carbon to make activated carbon energy storage aggregate, and then the aggregate was added into concrete to prepare phase change concrete. The basic mechanical properties, thermal conductivity, heat storage and release heat storage and phase transformation cycle stability tests of phase change concrete with different phase transition cycles (0 times, 30 times, 60 times) and different amount of activated carbon energy storage aggregates (0%, 10%, 15%, 20%, 25%) were carried out, and the test results were analyzed to prepare a kind of phase transformation cycle stability and good heat preservation and heat storage capacity. At the same time, the mechanical properties of the new concrete materials meet the requirements. The basic mechanical properties test shows that the mechanical properties of phase change concrete will be greatly reduced by increasing the content of activated carbon energy storage aggregate, but when the content is less than 15%, the compressive tensile strength and bending strength of phase change concrete will not decrease by more than 10% and 13% respectively. The basic mechanical properties of phase change concrete are little affected by temperature. At room temperature of 30 鈩，

本文編號(hào)：2497693