本文選題：預(yù)拌料混凝土　切入點(diǎn)：含水率　出處：《安徽理工大學(xué)》2017年碩士論文

【摘要】：礦井巷道爆破開挖沖擊荷載會(huì)造成井巷混凝土支護(hù)破壞。研究預(yù)拌料混凝土沖擊動(dòng)力學(xué)特性,對(duì)保證井巷安全生產(chǎn)具有重要的工程意義。采用理論和試驗(yàn)相結(jié)合的方法,研究了砂子含水率為0%、1.0%、1.5%、2.0%,貯存期為Od、3d、7d、15d、20d、30d預(yù)拌料制成的預(yù)拌料混凝土在單軸與圍壓狀態(tài)下的動(dòng)力學(xué)特性,并對(duì)比分析。預(yù)拌料混凝土單軸沖擊試驗(yàn)結(jié)果表明,應(yīng)力峰值隨著預(yù)拌料貯存期和含水率的增加而減小。沖擊氣壓越大,其單軸沖擊峰值應(yīng)力越大,預(yù)拌料砂子含水率為1.0%、貯存期為3d時(shí)的應(yīng)力峰值最大,沖擊氣壓在0.6MPa和0.9MPa時(shí)的峰值應(yīng)力分別為35.4MPa和48.9Mpa,沖擊氣壓0.9MPa為0.6MPa峰值應(yīng)力的1.3倍。當(dāng)預(yù)拌料砂子含水率為1.0%、貯存期在3d以內(nèi)時(shí),其峰值應(yīng)力達(dá)到了 C30混凝土靜態(tài)抗壓強(qiáng)度要求。預(yù)拌料混凝土被動(dòng)圍壓狀態(tài)下沖擊試驗(yàn)結(jié)果表明,其應(yīng)力峰值隨著預(yù)拌料貯存期和含水率的增加而減小。不考慮預(yù)拌料貯存期0天含水率為0%組,預(yù)拌料貯存期為3d,含水率為1.0%時(shí)其應(yīng)力峰值最大,峰值應(yīng)力為58.3MPa。預(yù)拌料含水率為1.0%貯存期少于7d時(shí),其應(yīng)力峰值變化不大。預(yù)拌料貯存期在30d以內(nèi)的應(yīng)力峰值均滿足C30混凝土靜態(tài)抗壓強(qiáng)度標(biāo)準(zhǔn)值30MPa要求。沖擊氣壓越大,被動(dòng)圍壓下預(yù)拌料混凝土的沖擊峰值應(yīng)力越大,預(yù)拌料混凝土在沖擊氣壓為0.9MPa下沖擊強(qiáng)度應(yīng)力峰值約為沖擊氣壓為0.6MPa時(shí)沖擊應(yīng)力峰值的1.7倍。在單軸和被動(dòng)圍壓狀態(tài)下,預(yù)拌料混凝土沖擊應(yīng)力峰值均隨預(yù)拌料含水率和貯存期增加而減小。被動(dòng)圍壓對(duì)預(yù)拌料混凝土的沖擊應(yīng)力峰值有加強(qiáng)作用,預(yù)拌料混凝土在有圍壓狀態(tài)下的沖擊應(yīng)力峰值約為無(wú)圍壓狀態(tài)下沖擊應(yīng)力峰值的1.5倍。
[Abstract]:The impact load of blasting excavation in mine roadway will cause damage to concrete support in roadway. It is of great engineering significance to study the impact dynamic characteristics of ready-mixed concrete in order to ensure the safe production of roadway. The method of combining theory with test is adopted. The dynamic characteristics of premixed concrete made of sand with water content of 0 and 1.0 and 1.5 and 2.0, and storage life of Od3 days, 7 days, 15 days and 20 days or 30 days, under uniaxial and confining pressure conditions are studied, and the results of uniaxial impact test of premixed concrete show that the dynamic characteristics of the premixed concrete under uniaxial and confining pressure are compared and analyzed. The peak stress decreases with the increase of storage life and moisture content of premixed materials. The higher the impact pressure, the greater the peak stress of uniaxial impact, the moisture content of sand is 1.0, and the maximum stress peak is when the storage life is 3 days. The peak stress of impact pressure at 0.6MPa and 0.9MPa is 35.4MPa and 48.9 Mpa.The impact pressure 0.9MPa is 1.3 times of the peak stress of 0.6MPa. When the moisture content of ready mixed sand is 1.0, the storage life is less than 3 days. The peak stress meets the static compressive strength requirement of C30 concrete. The impact test results of premixed concrete under passive confining pressure show that, The stress peak value decreases with the increase of the storage life and moisture content of the ready-mixed material. The maximum stress peak value is obtained when the storage life of the ready-mixed material is 3 days and the moisture content is 1.0, without considering the group of 0% water content in the 0 day storage period of the ready-mixed material, and when the storage life of the ready-mixed material is 3 days, and the moisture content is 1.0. The peak stress is 58.3 MPA. When the moisture content of premixed material is 1.0% storage life less than 7 days, the peak stress value changes little. The stress peak value within 30 days of pre-mixed material storage life all meet the 30MPa requirement of static compressive strength of C30 concrete. The higher the impact pressure is, the higher the stress peak value is. Under passive confining pressure, the maximum impact stress of ready-mixed concrete is about 1.7 times that of 0.6MPa at impact pressure of 0.9MPa. Under uniaxial and passive confining pressure, the peak value of impact stress of ready-mixed concrete is about 1.7 times that of 0.6MPa. The peak value of impact stress of ready-mixed concrete decreases with the increase of moisture content and storage life of ready-mixed concrete. Passive confining pressure can strengthen the peak of impact stress of ready-mixed concrete. The peak value of impact stress of ready-mixed concrete under confining pressure is about 1.5 times of that under no confining pressure.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528.52

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 覃維祖;活性粉末混凝土的研究[J];石油工程建設(shè);2002年03期

2 鞠彥忠;王菊;;新型活性粉末混凝土的開發(fā)與性能研究[J];東北電力大學(xué)學(xué)報(bào);2006年02期

3 劉小平;;活性粉末混凝土的特性及其發(fā)展前景[J];混凝土與水泥制品;2006年03期

4 汪忠;;活性粉末混凝土的應(yīng)用探析[J];中國(guó)城市經(jīng)濟(jì);2011年20期

5 孫志光;;活性粉末混凝土的制備原理與特性[J];商品混凝土;2012年09期

6 王福星;胡益鑄;李法雄;李萬(wàn)恒;;活性粉末混凝土研究新進(jìn)展[J];公路交通科技(應(yīng)用技術(shù)版);2013年09期

7 蔡路;陳太林;陳磊;來(lái)源;;活性粉末混凝土的配制原理及應(yīng)用[J];河南建材;2006年05期

8 何峰;黃政宇;;活性粉末混凝土原材料及配合比設(shè)計(jì)參數(shù)的選擇[J];新型建筑材料;2007年03期

9 閆光杰;閻貴平;;活性粉末混凝土雙向拉壓強(qiáng)度試驗(yàn)研究[J];中國(guó)安全科學(xué)學(xué)報(bào);2007年03期

10 鄢飛;;活性粉末混凝土研究進(jìn)展[J];福建建筑;2008年08期

相關(guān)會(huì)議論文 前10條

1 閆光杰;劉培文;;活性粉末混凝土研究與應(yīng)用進(jìn)展[A];纖維混凝土的技術(shù)進(jìn)展與工程應(yīng)用——第十一屆全國(guó)纖維混凝土學(xué)術(shù)會(huì)議論文集[C];2006年

2 孫偉;劉斯鳳;賴建中;林瑋;;生態(tài)型活性粉末混凝土的制備和性能研究[A];中國(guó)硅酸鹽學(xué)會(huì)2003年學(xué)術(shù)年會(huì)論文摘要集[C];2003年

3 孫偉;劉斯鳳;賴建中;林瑋;;生態(tài)型活性粉末混凝土的制備和性能研究[A];中國(guó)硅酸鹽學(xué)會(huì)2003年學(xué)術(shù)年會(huì)水泥基材料論文集（下冊(cè)）[C];2003年

4 覃維祖;;活性粉末混凝土的研究[A];吳中偉院士從事科教工作六十年學(xué)術(shù)討論會(huì)論文集[C];2004年

5 張立軍;安明U，

本文編號(hào)：1682385