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鄒慶余¹  , 周    理 ^1 , 3  , 胡    松² , 徐一峰¹ , 尹    超 ¹

( 1. 貴州大學(xué)建筑與城市規(guī)劃學(xué)院 ，貴州 貴陽 550025 ; 2. 銅仁學(xué)院農(nóng)林工程與規(guī)劃學(xué)院 ，貴州 銅仁 554300;

3. 貴州省山地人居智慧與綠色建造工程研究中心 ，貴州 貴陽 550025)

摘   要： 為研究纖維增強(qiáng)磷石膏的受拉應(yīng)力－應(yīng)變曲線，將磷石膏粉 、水泥 、纖維的質(zhì)量比設(shè)定為 90%、10%及 0. 2% , 以水灰比  (0. 7、0. 8、0. 9) 為變化參數(shù)，制作了 12 個(gè)棱柱體試塊 。通過軸向單調(diào)拉伸試驗(yàn)，分析了纖維增強(qiáng)磷石膏的受拉應(yīng)力－應(yīng)變曲線、抗拉強(qiáng)度 、峰值應(yīng)變等力學(xué)指標(biāo) 。對(duì)歸一化曲線進(jìn)行擬合，給出了應(yīng)力－應(yīng)變曲線的數(shù)學(xué)表達(dá)式。研究表明，受拉應(yīng)力－應(yīng)變曲線呈非線性變化，且水灰比越低，曲線越陡峭； 當(dāng)水灰比從 0. 7 增加至0. 8 及 0. 9 時(shí)，軸心抗拉強(qiáng)度分別降低了 11. 4%及 34. 3% ; 峰值拉應(yīng)變受水灰比影響較小， 應(yīng)變測(cè)量值位于 31. 5 με ~ 54. 8 με 區(qū)間。

關(guān)鍵詞： 纖維； 磷石膏； 軸心受拉； 應(yīng)力－應(yīng)變； 試驗(yàn)研究

中圖分類號(hào)： TU522      

文獻(xiàn)標(biāo)志碼： A      

文章編號(hào)： 1005-8249 (2023) 04-0053-06

DOI : 10. 19860/j.cnki.issn1005-8249.2023.04.009

ZOU Qingyu1 , ZHOU Li1 , 3 , HU Song2 , XU Yifeng1 , YIN Chao1

( 1. College of Architecture and Urban planning , Guizhou University , Guiyang 550025 , China;

2. College of Agroforestry Engineering and Planing , Tongren University , Tongren 554300 , China;

3. Intelligent and Green Mountain Residence Engineering Research Center of Guizhou Province ,

Guiyang 550025 , China)

Abstract: To study the tensile stress-strain curve of fiber-reinforced phosphogypsum, the mass ratio of phosphogypsum powder, cement and fiber was set at 90%, 10%, and 0.2%, and 12 prism test samples were fabricated with the water-cement ratio (0.7, 0.8, 0.9) as the change parameters. Through the axial monotonic tensile test, the tensile stress-strain curve, tensile strength, peak strain, and other mechanical indexes of fiber-reinforced phosphogypsum were analyzed. The normalized curves were fitted, and the mathematical expression of the stress-strain curve was given. The research shows that the tensile stress-strain curves are nonlinear, and the lower the water-cement ratio is, the steeper the curve is; When the water-cement ratio increases from 0.7 to 0.8 and 0.9, the axial tensile strength decreases by 11.4% and 34.3% respectively; The peak tensile strain is less affected by the water-cement ratio, and the measured strain values are in the range of 31.5 με~54.8 με.

Keywords: fiber; phosphogypsum; axial tension; stress-strain; experimental investigation

?基金項(xiàng)目： 國家自然科學(xué)基金資助（項(xiàng)目批準(zhǔn)號(hào)： 52068007) , 貴州省基礎(chǔ)研究計(jì)劃（ 黔科合基礎(chǔ)  [2020] 1 Y417) , 貴州大學(xué)引進(jìn)人才科研基金資助項(xiàng)目[2019 (08) 號(hào)］。

作者簡介：鄒慶余  ( 1996— ) , 男 ，碩士研究生 。主要從事綠色建筑材料及其應(yīng)用研究。 

通信作者：周理  ( 1983— ) , 男 ，博士 ，副教授 。主要從事綠色建筑材料及其應(yīng)用研究。 

收稿日期： 2022-6-21