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(內(nèi)蒙古科技大學(xué)土木工程學(xué)院， 包頭 014010)

［摘要］通過(guò)風(fēng)積沙等質(zhì)量取代普通河砂制備風(fēng)積沙混凝土（ASC），對(duì)其開(kāi)展抗壓強(qiáng)度試驗(yàn)研究，并借助掃描電鏡（SEM）和核磁共振（NMR）分析ASC內(nèi)部微觀形貌和孔結(jié)構(gòu)特征。結(jié)果表明：抗壓強(qiáng)度隨著風(fēng)積沙替代率的增加呈先增大后減小的趨勢(shì)，風(fēng)積沙替代率為20%時(shí)，抗壓強(qiáng)度最大。ASC的T2譜分布主要表現(xiàn)為3~4個(gè)峰，風(fēng)積沙摻入使硬化后混凝土的大孔向小孔發(fā)展。抗壓強(qiáng)度與膠凝孔所占比成正相關(guān)關(guān)系，與孔隙率成反比例關(guān)系，而與毛細(xì)孔和非毛細(xì)孔所占比并未表現(xiàn)出顯著的關(guān)系。最后，建立了ASC抗壓強(qiáng)度與孔結(jié)構(gòu)特征參數(shù)（孔隙率和孔徑分布）之間的函數(shù)模型，該模型具有較好的擬合精度。 

［關(guān)鍵詞］風(fēng)積沙混凝土；微觀結(jié)構(gòu)；抗壓強(qiáng)度；掃描電鏡；孔結(jié)構(gòu)；函數(shù)模型 

中圖分類(lèi)號(hào)：TU528 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)16-0135-05

 Study on microstructure and pore characteristics of aeolian sand concrete 

YIN  Yingzi,  LEI  Yanan,  SU  Ying 

(School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010， China) 

Abstract: Aeolian sand concrete (ASC) was prepared by replacing ordinary river sand with aeolian sand of equal mass, and the compressive strength test of ASC was carried out, the microstructure and pore structure of ASC were analyzed by scanning electron microscope (SEM) and nuclear magnetic resonance (NMR). The results show that the compressive strength increases first and then decreases with the increase of the replacement rate of aeolian sand. When the replacement rate of aeolian sand is 20%, the compressive strength is the largest. The T2 spectral distribution of ASC is mainly shown as 3~4 peaks. The addition of aeolian sand made the large holes of hardened concrete develop into small holes. The compressive strength is positively correlated with the proportion of cementitious pores and inversely correlated with the porosity, but not significantly correlated with the proportion of capillary and non-capillary pores. Finally, a functional model between ASC compressive strength and pore structure characteristic parameters (porosity and pore size distribution) was established, which had a good fitting accuracy. 

Keywords:aeolian sand concrete； microstructure； compressive strength； scanning electron microscope； pore structure； function model

*內(nèi)蒙古自治區(qū)自然科學(xué)(2013MS0717,2017MS(LH)0523)，內(nèi)蒙古研究生科研創(chuàng)新項(xiàng)目（S2018112030Z）。

 作者簡(jiǎn)介：銀英姿，教授，碩士生導(dǎo)師，Email:811489571@qq.com。