本文選題：活性粉末混凝土 + 玄武巖纖維　； 參考：《北京交通大學(xué)》2013年碩士論文

【摘要】：活性粉末混凝土作為一種新型混凝土材料,具有良好的物理力學(xué)性能與應(yīng)用前景。鋼纖維的摻入雖然能夠增強(qiáng)增韌活性粉末混凝土的力學(xué)性能,但由于鋼纖維存在銹蝕的風(fēng)險(xiǎn),因此這樣對(duì)活性粉末混凝土在氯離子和除冰鹽環(huán)境等極端惡劣環(huán)境下的耐久性可能會(huì)造成不利影響。玄武巖纖維作為一種新型的硅酸鹽纖維,具有高強(qiáng)度、高彈模、良好的耐高溫性等優(yōu)良特性。若能用玄武巖纖維替代鋼纖維摻入活性粉末混凝土,對(duì)提高極嚴(yán)酷環(huán)境下活性粉末混凝土結(jié)構(gòu)的耐久性具有重要意義。 本文嘗試在活性粉末混凝土中加入玄武巖纖維代替鋼纖維,對(duì)玄武巖纖維活性粉末混凝土的基本力學(xué)性能與耐久性進(jìn)行了試驗(yàn)研究,主要研究結(jié)果如下： 1.研究了纖維長(zhǎng)度(6mm、12mm)和體積摻量(0.0%、0.5%、1.0%、1.5%、2.0%)對(duì)活性粉末混凝土的立方體抗壓強(qiáng)度、劈裂抗拉強(qiáng)度等強(qiáng)度指標(biāo)的影響,研究認(rèn)為玄武巖纖維對(duì)活性粉末混凝土的力學(xué)性能有一定的影響,且隨著纖維摻量的增大,活性粉末混凝土的抗壓強(qiáng)度、劈裂抗拉強(qiáng)度、抗折強(qiáng)度均呈現(xiàn)先增大后減小的趨勢(shì)。6mm的玄武巖纖維活性粉末混凝土的最佳摻量為1.0%,12mm的玄武巖纖維活性粉末混凝土的最佳摻量為1.5%。 2.通過(guò)研究玄武巖纖維體積摻量分別為0.0%、1.0%、2.0%的活性粉末混凝土的單軸受壓的荷載和應(yīng)變值,得到其單軸受壓的應(yīng)力應(yīng)變曲線。在已有單軸受壓應(yīng)力應(yīng)變本構(gòu)模型方程式的基礎(chǔ)上,分別得出了不同玄武巖纖維摻量情況下的應(yīng)力-應(yīng)變關(guān)系方程。 3.測(cè)定了玄武巖纖維體積摻量分別為0.0%、1.0%、2.0%的玄武巖纖維活性粉末混凝土的電通量,得出結(jié)論玄武巖纖維活性粉末混凝土的電通量均在12C以下,其內(nèi)部結(jié)構(gòu)均勻致密。 4.使用SEM方法研究玄武巖纖維凈漿試件和玄武巖纖維材料在Ca(OH)2飽和溶液中75℃蒸汽養(yǎng)護(hù)三天后的微觀形貌。研究結(jié)果表明：玄武巖纖維在高溫強(qiáng)堿溶液中產(chǎn)生輕微腐蝕,在高溫蒸汽養(yǎng)護(hù)的凈漿試件中也有輕微的腐蝕現(xiàn)象,這種腐蝕程度基本不會(huì)對(duì)混凝土力學(xué)性能和耐久性造成嚴(yán)重影響。
[Abstract]:As a new type of concrete material, reactive powder concrete has good physical and mechanical properties and application prospects.Although the addition of steel fiber can enhance the mechanical properties of toughened reactive powder concrete, but because of the risk of corrosion of steel fiber,Therefore, the durability of reactive powder concrete under extreme conditions, such as chloride ion and deicing salt environment, may be adversely affected.As a new silicate fiber, basalt fiber has high strength, high modulus of elasticity and good high temperature resistance.If basalt fiber can be used instead of steel fiber to add reactive powder concrete, it is of great significance to improve the durability of reactive powder concrete structure under extremely harsh environment.In this paper, basalt fiber is used to replace steel fiber in reactive powder concrete. The basic mechanical properties and durability of reactive powder concrete with basalt fiber are studied. The main results are as follows:1.The effects of fiber length of 6 mm / 12mm) and volume content of 0. 0 ~ 0. 5) on the cube compressive strength and split tensile strength of reactive powder concrete (RPC) were studied. The results show that basalt fiber has a certain effect on the mechanical properties of RPC.And with the increase of fiber content, the compressive strength and splitting tensile strength of reactive powder concrete,The flexural strength of basalt fiber reactive powder concrete increased first and then decreased. The optimum content of basalt fiber reactive powder concrete with 1.0 ~ 12 mm basalt fiber reactive powder concrete was 1.5mm.2.By studying the uniaxial compression load and strain value of reactive powder concrete (RPC) with the volume content of basalt fiber being 0.010% and 2.0% respectively, the stress-strain curves of the concrete under uniaxial compression are obtained.On the basis of the constitutive equation of uniaxial compression stress-strain model, the stress-strain relation equations under different basalt fiber content are obtained.3.The electric flux of basalt fiber reactive powder concrete with volume addition of 0.010% basalt fiber and 2.0% basalt fiber reactive powder concrete has been measured. It is concluded that the electric flux of basalt fiber reactive powder concrete is below 12C, and its internal structure is uniform and compact.4.SEM method was used to study the microstructure of basalt fiber samples and basalt fiber materials after three days of steam curing at 75 鈩，

本文編號(hào)：1734269