橡膠改性免蒸壓管樁混凝土抗沖擊性能研究
發(fā)布時間：2018-11-27 18:04
【摘要】：PHC管樁又稱預(yù)應(yīng)力高強(qiáng)混凝土管樁,是樁基礎(chǔ)建設(shè)的一種重要的建筑構(gòu)件。隨著我們國家建筑工業(yè)現(xiàn)代化進(jìn)程的不斷推進(jìn),人們對于PHC管樁的需求不斷增加,對于PHC管樁的性能和標(biāo)準(zhǔn)也在不斷提高。目前的免蒸壓管樁混凝土的制備,由于省去了傳統(tǒng)的高溫高壓養(yǎng)護(hù)的工藝,其抗沖擊性能要低于蒸壓管樁。而且為了實現(xiàn)免蒸壓管樁混凝土的早強(qiáng)特性,配合比中往往加入許多摻合物,如礦渣粉,硅粉,微珠,減水劑等,這些摻合物能夠改善管樁混凝土的和易性、提高混凝土的耐久性等優(yōu)點(diǎn),但若是直接投入生產(chǎn),成本往往非常巨大,在尚未知道混凝土性質(zhì)之前,草率地將新工藝生產(chǎn)的PHC管樁制品投入市場也是十分不明智的。且在工程實例上和科學(xué)研究上,免蒸壓管樁受沖擊破壞率都高于蒸壓管樁。所以本研究旨在通過向管樁混凝土中摻入一定量的橡膠粉顆粒,嘗試通過橡膠柔性大,變形能力強(qiáng)的特點(diǎn),改變管樁混凝土的韌性低和抗沖擊性能差的缺陷。研究過程中了解熟悉了管樁從材料到成品的整個生產(chǎn)流程。以免蒸壓管樁混凝土作為基礎(chǔ)混凝土,制作了橡膠粉摻量不同的混凝土試塊。所有混凝土試塊都與同一批次的管樁在同等條件下攪拌、成型、養(yǎng)護(hù)。通過混凝土的靜態(tài)抗壓實驗和SHPB壓桿沖擊實驗,研究了橡膠粉對管樁混凝土靜態(tài)抗壓強(qiáng)度的影響和橡膠混凝土的一些力學(xué)性能。通過實驗結(jié)果和理論分析,研究發(fā)現(xiàn)橡膠粉對混凝土靜態(tài)抗壓強(qiáng)度的影響主要是由于其改變了混凝土內(nèi)部結(jié)構(gòu)的粘結(jié)界面強(qiáng)度造成的,橡膠混凝土的靜態(tài)抗壓強(qiáng)度會隨著橡膠粉摻入量的增加而下降。橡膠混凝土在靜態(tài)壓縮條件下破壞的形態(tài)也與普通混凝土有很大的差異。從SHPB壓桿沖擊實驗,研究了橡膠混凝土在高應(yīng)變率荷載下的性能。在破壞形態(tài)上,隨著應(yīng)變率的增加,橡膠混凝土的破壞由裂縫變成粉碎。橡膠混凝土與普通混凝土一樣,體現(xiàn)出動態(tài)增強(qiáng)效應(yīng),其動態(tài)抗壓強(qiáng)度高于靜態(tài)抗壓強(qiáng)度,其變化的規(guī)律與沖擊速度和能量有關(guān),也與橡膠摻量密不可分。橡膠粉能夠改善混凝土的變形性能,橡膠混凝土破壞時的吸能效果也比普通混凝土要高。這些研究結(jié)果對免蒸壓管樁性能的研究和橡膠改性混凝土的研究提供了一定的參考。
[Abstract]:PHC pipe pile, also called prestressed high strength concrete pipe pile, is an important building member in pile foundation construction. With the development of modernization of China's construction industry, the demand for PHC pipe pile is increasing, and the performance and standard of PHC pipe pile are also improving. At present, the preparation of non-autoclaved pipe pile concrete is lower than that of autoclaved pipe pile because the traditional high-temperature and high-pressure curing technology is eliminated. And in order to realize the early strength characteristic of the concrete without autoclaved pressure pipe pile, many admixtures, such as slag powder, silica powder, microbeads, water reducer and so on, are often added to the mix ratio. These admixtures can improve the workability of pipe pile concrete. To improve the durability of concrete, however, if the concrete is put into production directly, the cost is very large, and it is very unwise to put the PHC pipe pile products produced by the new technology into the market without knowing the nature of the concrete. In engineering practice and scientific research, the impact failure rate of non-autoclaved pipe pile is higher than that of autoclaved pipe pile. So the purpose of this study is to change the defects of low toughness and poor impact resistance of pipe pile concrete by adding a certain amount of rubber powder particles into the concrete of pipe pile and through the characteristics of large rubber flexibility and strong deformation ability. In the course of the research, we are familiar with the whole production process of pipe pile from material to finished product. In order to avoid autoclaved pipe pile concrete as foundation concrete, concrete test blocks with different rubber powder content were made. All concrete test blocks are mixed, formed and maintained under the same conditions with the same batches of pipe piles. The influence of rubber powder on static compressive strength of pipe pile concrete and some mechanical properties of rubber concrete were studied by static compression test of concrete and impact test of SHPB compression bar. Through the experimental results and theoretical analysis, it is found that the influence of rubber powder on the static compressive strength of concrete is mainly due to the change of the bond strength of the internal structure of concrete. The static compressive strength of rubber concrete decreases with the increase of rubber powder content. The failure pattern of rubber concrete under static compression is also different from that of ordinary concrete. The performance of rubber concrete under high strain rate load was studied by SHPB compression bar impact test. With the increase of strain rate, the failure of rubber concrete changes from crack to comminution. The dynamic compressive strength of rubber concrete is higher than that of static concrete, and its dynamic compressive strength is higher than that of static concrete. The law of change is related to the impact speed and energy, and is closely related to the rubber content. Rubber powder can improve the deformation performance of concrete, and the energy absorption effect of rubber concrete is higher than that of ordinary concrete. These results provide a certain reference for the study of the properties of non-autoclaved pipe piles and the study of rubber-modified concrete.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528
[Abstract]:PHC pipe pile, also called prestressed high strength concrete pipe pile, is an important building member in pile foundation construction. With the development of modernization of China's construction industry, the demand for PHC pipe pile is increasing, and the performance and standard of PHC pipe pile are also improving. At present, the preparation of non-autoclaved pipe pile concrete is lower than that of autoclaved pipe pile because the traditional high-temperature and high-pressure curing technology is eliminated. And in order to realize the early strength characteristic of the concrete without autoclaved pressure pipe pile, many admixtures, such as slag powder, silica powder, microbeads, water reducer and so on, are often added to the mix ratio. These admixtures can improve the workability of pipe pile concrete. To improve the durability of concrete, however, if the concrete is put into production directly, the cost is very large, and it is very unwise to put the PHC pipe pile products produced by the new technology into the market without knowing the nature of the concrete. In engineering practice and scientific research, the impact failure rate of non-autoclaved pipe pile is higher than that of autoclaved pipe pile. So the purpose of this study is to change the defects of low toughness and poor impact resistance of pipe pile concrete by adding a certain amount of rubber powder particles into the concrete of pipe pile and through the characteristics of large rubber flexibility and strong deformation ability. In the course of the research, we are familiar with the whole production process of pipe pile from material to finished product. In order to avoid autoclaved pipe pile concrete as foundation concrete, concrete test blocks with different rubber powder content were made. All concrete test blocks are mixed, formed and maintained under the same conditions with the same batches of pipe piles. The influence of rubber powder on static compressive strength of pipe pile concrete and some mechanical properties of rubber concrete were studied by static compression test of concrete and impact test of SHPB compression bar. Through the experimental results and theoretical analysis, it is found that the influence of rubber powder on the static compressive strength of concrete is mainly due to the change of the bond strength of the internal structure of concrete. The static compressive strength of rubber concrete decreases with the increase of rubber powder content. The failure pattern of rubber concrete under static compression is also different from that of ordinary concrete. The performance of rubber concrete under high strain rate load was studied by SHPB compression bar impact test. With the increase of strain rate, the failure of rubber concrete changes from crack to comminution. The dynamic compressive strength of rubber concrete is higher than that of static concrete, and its dynamic compressive strength is higher than that of static concrete. The law of change is related to the impact speed and energy, and is closely related to the rubber content. Rubber powder can improve the deformation performance of concrete, and the energy absorption effect of rubber concrete is higher than that of ordinary concrete. These results provide a certain reference for the study of the properties of non-autoclaved pipe piles and the study of rubber-modified concrete.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU528
【參考文獻(xiàn)】
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本文編號：2361618
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