本文關(guān)鍵詞： MKPC砂漿 織物網(wǎng) 界面粘結(jié) 加固 抗彎性能　出處：《蘇州科技學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：磷酸鉀鎂水泥(MKPC)是一種早強(qiáng)快硬的新型膠凝材料,與普通硅酸鹽水泥相比,MKPC具有低溫凝結(jié)快、粘結(jié)強(qiáng)度高、干縮小、耐磨性和抗凍性良好等優(yōu)點。本文通過進(jìn)行MKPC水泥基復(fù)合材料(該文均為“MKPC砂漿”)與老混凝土界面粘結(jié)性能、纖維織物增強(qiáng)MKPC砂漿薄板拉伸和彎曲性能以及纖維織物增強(qiáng)MKPC砂漿加固兩種缺陷梁的抗彎試驗得出如下結(jié)論:(1)MKPC砂漿與老混凝土之間的界面粘結(jié)抗剪性能以人工鑿槽時最佳;采用的新型加筋MKPC水泥凈漿銷栓對MKPC砂漿加固層與老混凝土之間的抗剪強(qiáng)度提高效果相對顯著;使用混合粗砂的MKPC加固層可以提高新老混凝土之間的粘結(jié)抗拉性能,而界面劑對MKPC砂漿與老混凝土界面粘結(jié)抗拉的增強(qiáng)效果不明顯。(2)短切玻璃纖維增強(qiáng)MKPC砂漿薄板拉伸強(qiáng)度效果要比玄武巖纖維好,且耐老化腐蝕能力會得到改善;纖維織物復(fù)合增強(qiáng)MKPC砂漿不僅能提高薄板彎曲承載力還起到了增韌的效果,且經(jīng)過80℃水溫老化后的玻璃纖維織物網(wǎng)不會腐蝕,僅基體強(qiáng)度有所降低。(3)對兩種不同缺陷梁(第一種為1根對比梁,2根一次受力損傷后加固梁;第二種為1根對比梁,2根鋼筋銹蝕后加固梁)進(jìn)行抗彎試驗研究,試驗梁在損傷40%初裂后卸載進(jìn)行纖維、織物增強(qiáng)MKPC砂漿加固的極限承載力仍有較大幅度的提高,但是加固層長度如果過短可能會發(fā)生剪切破壞;試驗梁在進(jìn)行鋼筋通電加速銹蝕(銹蝕率5%左右)后進(jìn)行纖維MKPC砂漿和纖維、織物復(fù)合增強(qiáng)MKPC纖維砂漿對比加固可以發(fā)現(xiàn)兩者對于梁體極限承載能力都有所提升,但增鋪織物網(wǎng)后的加固層剛度和延性得到提高,不會發(fā)生直接剝落現(xiàn)象。此次研究工作將推動MKPC在加固工程中的應(yīng)用,在提升MKPC復(fù)合材料的應(yīng)用技術(shù)水平;促進(jìn)新材料、新技術(shù)在工程中的開發(fā);推動建設(shè)工程科技進(jìn)步等方面都具有積極的意義。
[Abstract]:Potassium magnesium Phosphate cement (MKPC) is a new type of cementing material with early strength and quick hardening. Compared with ordinary Portland cement, MKPC has the advantages of fast condensation at low temperature, high bond strength and dry shrinkage. In this paper, the interface bond properties of MKPC cement matrix composites (all "MKPC mortar") with old concrete are studied. The tensile and bending properties of fiber fabric reinforced MKPC mortar sheet and the flexural test of two kinds of defective beams strengthened by fiber fabric reinforced MKPC mortar are as follows: (1) the interfacial bond shear resistance between MKPC mortar and old concrete is the best when artificial chiseling is the best; The new reinforced MKPC cement paste pin bolt can improve the shear strength between the MKPC mortar reinforced layer and the old concrete, and the MKPC strengthened layer with mixed coarse sand can improve the bond tensile performance between the new and old concrete. The tensile strength of short cut glass fiber reinforced MKPC mortar sheet is better than that of basalt fiber, and the aging corrosion resistance will be improved. Fiber fabric composite reinforced MKPC mortar can not only improve the bending capacity of thin plate, but also toughen the glass fiber fabric net after 80 鈩，

本文編號：1535743