【摘要】：對(duì)混凝土在3.5%、10.5%、17.5%復(fù)合鹽(NaCl、Na_2SO_4、NaHCO_3、Na_2CO_3)溶液的侵蝕作用下,研究了在復(fù)合鹽侵蝕和凍融循環(huán)作用下C30混凝土的應(yīng)力-應(yīng)變關(guān)系的變化規(guī)律,對(duì)6組42個(gè)尺寸為100 mm×100 mm×100 mm的混凝土立方體試件進(jìn)行了凍融循環(huán),并利用SEM掃描電鏡觀察凍融作用后混凝土內(nèi)部顯微結(jié)構(gòu)的變化。試驗(yàn)結(jié)果表明:(1)復(fù)合鹽溶液侵蝕作用下,浸泡凍融的凍融循環(huán)次數(shù)相同時(shí),混凝土的峰值應(yīng)力隨溶液濃度的增加而有所增大,峰值應(yīng)變隨之左移,應(yīng)力-應(yīng)變曲線逐漸趨于平緩;相對(duì)于養(yǎng)護(hù)凍融,浸泡凍融條件下,隨著侵蝕溶液濃度的增加,試件的峰值應(yīng)力降低的少;(2)進(jìn)行150次凍融循環(huán)試驗(yàn)后,隨著復(fù)合鹽侵蝕溶液濃度的增加,經(jīng)浸泡凍融試驗(yàn)的混凝土試件的抗壓強(qiáng)度分別降低了36.1%、35.9%、34.3%,而經(jīng)養(yǎng)護(hù)凍融試驗(yàn)的混凝土試件的抗壓強(qiáng)度分別降低了55.6%、59.9%、57.6%;(3)經(jīng)掃描電鏡(SEM)分析,隨著復(fù)合鹽侵蝕溶液濃度的增加,混凝土損傷程度減弱。
[Abstract]:The concrete was corroded by 3.5% and 10.5% of the compound salt (NaCl,Na_2SO_4,NaHCO_3,Na_2CO_3) solution, The stress-strain relationship of C30 concrete under the action of composite salt erosion and freeze-thaw cycle was studied. Six groups of concrete cube specimens with size of 100 mm 脳 100 mm were subjected to freeze-thaw cycle. The microstructure of concrete after freezing and thawing was observed by SEM scanning electron microscope. The results show that: (1) when the freezing and thawing cycles are the same, the peak stress of concrete increases with the increase of solution concentration, and the peak strain shifts to the left. The stress-strain curve tends to be gentle; Compared with the curing freezing and thawing, the peak stress of the specimen decreases with the increase of the concentration of corrosion solution under the condition of immersion freezing and thawing. (2) after 150 freeze-thaw cycle tests, with the increase of the concentration of the composite salt erosion solution, the compressive strength of the concrete specimens subjected to immersion freezing and thawing test decreased by 36.1% and 35.9% respectively. The compressive strength of the concrete specimens tested by the curing freeze-thaw test has been reduced by 55.69.9and 57.6respectively. (3) (SEM) analysis shows that the damage degree of concrete decreases with the increase of the concentration of complex salt solution.
【作者單位】： 華北水利水電大學(xué)土木與交通學(xué)院;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目(51779095);國(guó)家自然科學(xué)基金青年基金(51209094) 鄭州市科技攻關(guān)項(xiàng)目(153PKJGG111)
【分類(lèi)號(hào)】：TU528

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