本文關(guān)鍵詞： 混凝土 氯離子 硫酸根 海洋環(huán)境 結(jié)合能力 表面區(qū)濃度　出處：《青島理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：混凝土耐久性問題是當(dāng)今世界各國(guó)海洋工程所面臨的最嚴(yán)峻問題之一，海洋環(huán)境中高濃度的氯離子和硫酸根離子是引起鋼筋銹蝕及混凝土保護(hù)層損傷破壞的主要因素。本文通過海洋暴露試驗(yàn)，室內(nèi)模擬試驗(yàn)系統(tǒng)研究不同腐蝕環(huán)境、不同類型混凝土的氯離子結(jié)合能力、混凝土表面氯離子濃度演變規(guī)律。以及不同類型、不同海洋腐蝕區(qū)域混凝土中硫酸根反應(yīng)量及表面區(qū)硫酸根離子演變規(guī)律。研究的主要內(nèi)容及相關(guān)結(jié)論如下： （1）本文通過海洋環(huán)境（大氣區(qū)、浪濺區(qū)、潮汐區(qū)、海沙區(qū)）及室內(nèi)模擬環(huán)境暴露試驗(yàn)，研究了海洋不同區(qū)域、混凝土中礦物摻合料類型及摻量、腐蝕齡期對(duì)混凝土氯離子結(jié)合能力的影響。試驗(yàn)結(jié)果表明：海洋環(huán)境下，混凝土氯離子結(jié)合能力會(huì)在一段齡期內(nèi)出現(xiàn)下降，隨后會(huì)隨齡期的增長(zhǎng)而提高。礦粉摻量為30%或者粉煤灰摻量為15%~30%時(shí)，混凝土氯離子結(jié)合能力最高；室內(nèi)環(huán)境條件下，置于1%Nacl中的混凝土粉末，其氯離子結(jié)合量會(huì)隨浸泡齡期的延長(zhǎng)而增加； （2）本文通過實(shí)海暴露試驗(yàn)及室內(nèi)試驗(yàn)系統(tǒng)研究了礦物摻合料、腐蝕齡期、腐蝕區(qū)域?qū)炷帘砻鎱^(qū)氯離子濃度的影響。試驗(yàn)結(jié)果表明：室內(nèi)模擬獲得的試驗(yàn)結(jié)果演變規(guī)律與實(shí)海暴露一致。海洋環(huán)境條件下，摻加適當(dāng)摻量礦物摻合料可以降低混凝土表面區(qū)氯離子濃度�；炷帘砻鎱^(qū)氯離子濃度關(guān)系為：海沙區(qū)潮汐區(qū)浪濺區(qū)大氣區(qū)。當(dāng)?shù)V粉摻量為30%時(shí)，混凝土表面氯離子濃度最低�；炷帘砻鎱^(qū)氯離子濃度隨腐蝕齡期增加而呈指數(shù)增加。適量硫酸根離子存在對(duì)混凝土中氯離子的侵入有促進(jìn)作用。 （3）本文在實(shí)海暴露試驗(yàn)基礎(chǔ)上，系統(tǒng)研究了礦物摻合料、腐蝕齡期、腐蝕區(qū)域?qū)炷亮蛩岣磻?yīng)量的影響。試驗(yàn)結(jié)果表明：摻加礦粉可以有效的減小混凝土與硫酸根的反應(yīng)量，，降低量最多為10%；摻加粉煤灰可以最多減小混凝土與硫酸根反應(yīng)量的13%�；炷僚c硫酸根反應(yīng)系數(shù)會(huì)隨齡期增長(zhǎng)保持在0.96~0.99之間；海洋不同腐蝕區(qū)域混凝土硫酸根離子反應(yīng)量大小為：潮汐區(qū)海沙區(qū)浪濺區(qū)≈大氣區(qū)。 （4）本文研究了室內(nèi)環(huán)境下混凝土粉末與硫酸根的反應(yīng)以及混凝土表面區(qū)硫酸根離子演變規(guī)律。試驗(yàn)結(jié)果表明：當(dāng)?shù)V粉摻量在50%以上時(shí)，可使混凝土抗硫酸根侵蝕性能增強(qiáng)。粉煤灰最佳摻量與腐蝕溶液類型有關(guān)�；炷练勰┡c硫酸根的反應(yīng)量會(huì)隨著齡期的增加而提高。復(fù)合溶液中當(dāng)氯離子濃度較低時(shí)能夠阻礙硫酸根的侵入。
[Abstract]:The durability of concrete is one of the most serious problems in marine engineering all over the world. The high concentration of chloride ion and sulfate ion in marine environment are the main factors that cause the corrosion of steel bar and the damage of concrete protective layer. In this paper, different corrosion environments are studied by marine exposure test and laboratory simulation test system. The chloride binding capacity of different types of concrete, the evolution law of chloride ion concentration on the surface of concrete, and different types of concrete. The amount of sulfate reaction and the evolution law of sulfate ion in concrete of different marine corrosion areas. The main contents and relevant conclusions of the study are as follows: 1) in this paper, the types and contents of mineral admixtures in concrete in different areas of the ocean are studied by means of marine environment (large air area, splash area, tidal zone, sea sand area) and indoor simulated environmental exposure test. The effect of corrosion age on the chloride binding capacity of concrete. The experimental results show that the chloride binding capacity of concrete will decrease in a certain period of time under the marine environment. When the amount of mineral powder is 30% or the amount of fly ash is 15 ~ 30, the chloride binding capacity of concrete is the highest. Under indoor conditions, the chloride binding capacity of concrete powder placed in 1 NaCl will increase with the prolongation of immersion age. 2) in this paper, the mineral admixture and corrosion age are studied by the real sea exposure test and laboratory test system. The effect of corrosion zone on chloride concentration on concrete surface. The experimental results show that the experimental results obtained by indoor simulation are consistent with those of real sea exposure. The concentration of chloride ions in concrete surface can be reduced by adding appropriate mineral admixture. The relationship of chloride ion concentration on concrete surface is as follows: tidal zone in sea sand area, large air area in wave splash area, and when the amount of mineral powder is 30%, the concentration of chloride ion in concrete surface area can be reduced. The concentration of chloride ion on concrete surface is the lowest. The concentration of chloride ion in concrete surface increases exponentially with the increase of corrosion age. The presence of appropriate sulfate ion can promote the invasion of chloride ion in concrete. 3) on the basis of real sea exposure test, the mineral admixture and corrosion age are systematically studied in this paper. The experimental results show that the addition of mineral powder can effectively reduce the amount of reaction between concrete and sulfate radical, and the maximum reduction amount is 10%; The addition of fly ash can reduce the reaction amount of concrete and sulfate at most 13%. The coefficient of reaction between concrete and sulfate can be kept between 0.96 and 0.99 with the increase of age. The amount of sulfate ion reaction of concrete in different corrosion areas of the sea is as follows: tidal zone, sea sand area, splash area, 鈮

本文編號(hào)：1452121