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  本文關鍵詞：寒區(qū)低熟料HPC路面塑性收縮影響因素研究　出處：《東北林業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 低熟料HPC 塑性收縮 開裂 平板法 圓環(huán)法

【摘要】：HPC(高性能混凝土)作為一種以耐久性為設計指標的新型混凝土,在實際工程應用中占比越來越大。在混凝土的發(fā)展進程中,開裂成為其不可避免的問題之一,其中混凝土早期塑性收縮階段產(chǎn)生的收縮開裂更是HPC缺陷問題中的重中之重。故本文對低熟料HPC的塑性開裂影響因素分析意義重大。本文從配合比和外界條件兩方面對低熟料HPC塑性收縮進行了研究。以平板法試驗為主,圓環(huán)法試驗為輔,進行綜合分析,并提出最優(yōu)配合比。研究了不同因素對低熟料HPC28d抗折強度和濕密度的影響。復摻礦物摻合料時,粉煤灰對抗折強度和濕密度有消極作用；礦粉和硅粉對抗折強度和濕密度有積極作用；水膠比不斷增大,抗折強度和濕密度逐漸減��；摻入纖維后,抗折強度和濕密度提高。通過研究分析低熟料HPC塑性收縮的內部因素,得出不同種類礦物摻合料對低熟料HPC塑性收縮影響不同。隨粉煤灰摻量的不斷增加,混凝土的開裂面積逐漸減少；礦粉復摻情況下隨其摻量的增加混凝土的塑性收縮增大；隨硅粉摻量的增加混凝土塑性收縮顯著增加,其抗裂性能由大到小為：粉煤灰礦粉硅粉；水膠比對低熟料HPC塑性收縮影響復雜,其影響效果取決于與減水劑的匹配性；摻入纖維、橡膠粉的低熟料HPC可以有效抑制其塑性收縮；在同等坍落度情況下種類1減水劑抗裂性能弱于種類2和種類3,但考慮到實際應用價值可以低摻量使用；隨砂率、水泥用量的增加,混凝土塑性收縮增大。同時研究分析了低熟料HPC塑性收縮的外部影響因素,風速、溫度越大,混凝土塑性收縮越大；濕度越大,混凝土塑性開裂面積越��；在混凝土養(yǎng)護中,低風速高濕度較低溫度條件為佳。圓環(huán)法試驗結果驗證了平板法試驗分析結論,更進一步證明了水膠比與礦物摻合料是影響低熟料HPC塑性收縮的重要因素。
[Abstract]:As a new type of concrete with durability as its design index, HPC (High performance concrete) accounts for more and more in practical engineering applications. Cracking has become one of the inevitable problems. The shrinkage cracking caused by early plastic shrinkage of concrete is the most important part of HPC defect problem. Therefore, this paper is of great significance to the analysis of the factors affecting plastic cracking of low clinker HPC. The plastic shrinkage of low clinker HPC was studied in two aspects of boundary conditions. The ring test was used to analyze comprehensively and put forward the optimum mix ratio. The influence of different factors on the HPC28d flexural strength and wet density of low clinker was studied. When the mineral admixture was mixed with mineral admixture the effect of different factors on the flexural strength and wet density of low clinker was studied. Fly ash has negative effects on flexural strength and wet density. The resistance of mineral powder and silicon powder to flexural strength and wet density is positive. With the increase of water-binder ratio, the flexural strength and wet density decrease gradually. The flexural strength and wet density of low clinker HPC were increased with the addition of fiber. The internal factors of plastic shrinkage of low clinker HPC were analyzed. It is concluded that different mineral admixtures have different effects on the plastic shrinkage of low clinker HPC. With the increasing of fly ash content, the cracking area of concrete decreases gradually. The plastic shrinkage of concrete increases with the increase of mineral powder content. With the increase of the content of silica fume, the plastic shrinkage of concrete increases significantly, and the crack resistance of concrete increases from big to small: fly ash, mineral powder, silicon powder; The effect of water / binder ratio on plastic shrinkage of low clinker HPC is complex, and its effect depends on the compatibility with water reducer. The low clinker HPC with fiber and rubber powder can effectively inhibit its plastic shrinkage. Under the same slump condition, the crack resistance of type 1 water reducer is weaker than that of category 2 and category 3, but considering the practical application value, it can be used in low dosage. With the increase of sand ratio and cement content, the plastic shrinkage of concrete increases. At the same time, the external factors of plastic shrinkage of low clinker HPC are analyzed. The higher the wind speed and temperature, the greater the plastic shrinkage of concrete. The larger the humidity, the smaller the plastic cracking area of concrete; In the concrete maintenance, low wind speed and high humidity is better than the low temperature condition. The circle method test results verify the conclusion of plate test analysis. It is further proved that the ratio of water to binder and mineral admixture is an important factor affecting the plastic shrinkage of low clinker HPC.
【學位授予單位】：東北林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U416.2

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本文編號：1403783