【摘要】：短切玄武巖纖維增強(qiáng)橡膠混凝土(Chopped Basalt Fiber reinforced Rubber Concrete,簡(jiǎn)稱CBFRC)是將短切玄武巖纖維加入到橡膠混凝土中,通過(guò)與柔性材料橡膠顆粒的復(fù)合作用,在有效降低混凝土的彈性模量的同時(shí),增強(qiáng)混凝土的抗壓和抗折強(qiáng)度,為水泥混凝土路面減震降噪提供了可能。本文對(duì)CBFRC的立方體抗壓強(qiáng)度、軸心抗壓強(qiáng)度、靜力受壓彈性模量、抗折強(qiáng)度等力學(xué)性能進(jìn)行了試驗(yàn)研究。同時(shí)提出了CBFRC-RCC復(fù)合式路面結(jié)構(gòu),并對(duì)其車載應(yīng)力進(jìn)行有限元分析。具體研究成果如下:(1)隨著橡膠顆粒摻量的增加,混凝土立方體抗壓強(qiáng)度、軸心抗壓強(qiáng)度在逐漸減小。橡膠顆粒摻量在0~20%時(shí),混凝土強(qiáng)度降低緩慢,此后隨著橡膠顆粒摻量增加而迅速下降,當(dāng)橡膠顆粒摻量達(dá)到50%時(shí),其強(qiáng)度已不能滿足公路路面力學(xué)性能的要求。同時(shí)橡膠顆粒的摻入也改善了混凝土的破壞形態(tài),其韌性明顯增強(qiáng)。(2)隨著橡膠顆粒摻量的增加,橡膠混凝土的靜力受壓彈性模量在逐漸減小。橡膠顆粒摻量在0~30%時(shí),混凝土強(qiáng)度降低緩慢,此后隨著橡膠顆粒摻量增加而迅速下降。同時(shí)基于試驗(yàn)值回歸分析,建立了靜力受壓彈性模量與立方體抗壓強(qiáng)度的關(guān)系式。橡膠顆粒摻量在0~50%時(shí),混凝土泊松比從0.1823升高到0.2125。(3)0.2%短切玄武巖纖維摻入橡膠混凝土中后,其立方體抗壓強(qiáng)度、軸心抗壓強(qiáng)度、彈性模量及泊松比的試驗(yàn)點(diǎn)與原橡膠混凝土試驗(yàn)點(diǎn)幾乎重合,說(shuō)明加入玄武巖纖維對(duì)混凝土的上述力學(xué)性能影響較小。(4)隨著橡膠摻量的增加,混凝土的抗折強(qiáng)度逐漸降低,而隨短切玄武巖纖維摻量的增加,橡膠混凝土抗折強(qiáng)度,又有明顯的提高。(5)橡膠混凝土的立方體抗壓強(qiáng)度與抗折強(qiáng)度之比k(k亦稱為脆性系數(shù))隨橡膠摻量的增加而減小,并且短切玄武巖纖維的摻入可以進(jìn)一步降低k。(6)通過(guò)有限元軟件的模擬分析,獲得了CBFRC-RCC復(fù)合路面結(jié)構(gòu)在車載應(yīng)力下的變化規(guī)律:1)混凝土彈性模量的增加使相鄰層板底應(yīng)力減小,本層板底應(yīng)力增大;2)當(dāng)復(fù)合路面板總厚度增大時(shí),下層板底應(yīng)力減小,但上層板底拉應(yīng)力則隨上、下面層板相對(duì)厚度的減小而增大;3)上、下層板底應(yīng)力隨路基頂面當(dāng)量回彈模量Et的增大均減小。(7)根據(jù)上、下層路面板厚度、彈性模量以及路基頂面當(dāng)量回彈模量Et對(duì)復(fù)合路面板底應(yīng)力的影響規(guī)律,在CBFRC-RCC復(fù)合路面設(shè)計(jì)過(guò)程中,減小板底應(yīng)力可采取的措施有:1)適當(dāng)增大上層CBFRC的彈性模量、減小下層RCC的彈性模量;2)當(dāng)復(fù)合路面板總厚度一定時(shí),適當(dāng)增加上層CBFRC板厚、減小下層RCC板厚;3)適當(dāng)增大地基頂面當(dāng)量回彈模量Et。
[Abstract]:Short cut basalt fiber reinforced rubber concrete (Chopped Basalt Fiber reinforced Rubber Concrete,) is a kind of short cut basalt fiber which is added to rubber concrete. By combining with flexible rubber particles, the elastic modulus of concrete can be reduced effectively at the same time. Strengthening the compressive and flexural strength of concrete provides the possibility for reducing vibration and noise of cement concrete pavement. In this paper, the mechanical properties of CBFRC such as cube compressive strength, axial compressive strength, static compressive elastic modulus and flexural strength are studied experimentally. At the same time, the CBFRC-RCC composite pavement structure is put forward, and the stress on the vehicle is analyzed by finite element method. The specific research results are as follows: (1) with the increase of rubber particle content, the compressive strength and axial compressive strength of concrete cube gradually decrease. When the content of rubber particles is 0 ~ 20, the strength of concrete decreases slowly, and then decreases rapidly with the increase of the content of rubber particles. When the content of rubber particles reaches 50, its strength can not meet the requirements of the mechanical properties of highway pavement. At the same time, the addition of rubber particles also improves the failure form of concrete, and its toughness is obviously enhanced. (2) with the increase of rubber particle content, the static compressive elastic modulus of rubber concrete decreases gradually. When the content of rubber particles is 0 ~ 30, the strength of concrete decreases slowly, and then decreases rapidly with the increase of the content of rubber particles. At the same time, based on the regression analysis of the experimental values, the relationship between the compressive modulus of static compression and the compressive strength of the cube is established. The Poisson's ratio of concrete increases from 0.1823 to 0.2125 when the amount of rubber particles is 0 ~ 50. (3) when 0.2% short cut basalt fiber is mixed into rubber concrete, its cube compressive strength and axial compressive strength are obtained. The experimental sites of elastic modulus and Poisson's ratio almost coincide with the original rubber concrete test site, which indicates that the addition of basalt fiber has little effect on the above mechanical properties of concrete. (4) with the increase of rubber content, the flexural strength of concrete decreases gradually. However, with the increase of the content of short cut basalt fiber, the flexural strength of rubber concrete increases obviously. (5) the ratio of cube compressive strength to flexural strength of rubber concrete, k (also known as brittleness coefficient), decreases with the increase of rubber content. And the incorporation of short cut basalt fiber can further reduce k.( 6) through the simulation analysis of finite element software, the variation law of CBFRC-RCC composite pavement structure under on-board stress is obtained: 1) the bottom stress of adjacent laminate decreases with the increase of elastic modulus of concrete. The bottom stress of the laminate increases with the increase of the total thickness of the composite slab, but the tensile stress of the bottom increases with the decrease of the relative thickness of the laminate. 3) on the top, the tensile stress of the bottom of the laminate increases with the increase of the total thickness of the composite slab, and the tensile stress increases with the decrease of the relative thickness of the laminate. The bottom stress of the subgrade decreases with the increase of the equivalent modulus of resilience (Et) of the top surface of the roadbed. (7) according to the influence of the thickness of the upper and lower face slab, the elastic modulus and the equivalent modulus of resilience of the top surface of the roadbed, Et on the bottom stress of the composite pavement slab, In the design process of CBFRC-RCC composite pavement, the following measures can be taken to reduce the slab bottom stress: 1) to increase the elastic modulus of the upper layer of CBFRC and to decrease the elastic modulus of the lower layer of RCC; 2) to increase the thickness of the upper layer of CBFRC plate when the total thickness of the composite road panel is fixed. Reduce the thickness of the lower RCC plate; 3) increase the equivalent modulus of springback Et. of the top surface of the foundation appropriately
【學(xué)位授予單位】：河南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U414;U416.2

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