【摘要】：基于微生物礦化沉積的裂縫自修復技術能夠有效地實現(xiàn)混凝土裂縫的自診斷和自修復;然而,如果混凝土中微生物礦化沉積過程中所必需的營養(yǎng)物質(zhì)摻量不足,則可能限制其裂縫自修復效果的充分發(fā)揮。以科式芽孢桿菌為自修復劑,以膨脹珍珠巖為修復劑載體,研制出一種新型裂縫自修復混凝土。主要考察乳酸鈣摻量對基于科式芽孢桿菌礦化沉積的混凝土裂縫自修復效果的影響。試驗結果表明,經(jīng)過修復養(yǎng)護28 d后,研制的自修復混凝土表現(xiàn)出優(yōu)越的裂縫自修復能力,最大修復裂縫寬度達到0.67 mm,為普通混凝土最大裂縫修復寬度的2.23倍;并且乳酸鈣摻量對混凝土裂縫自修復效果影響較大,隨著乳酸鈣摻量的增加,混凝土的裂縫自修復能力顯現(xiàn)出先上升后趨于平穩(wěn)的趨勢,當乳酸鈣摻量為膠凝材料質(zhì)量分數(shù)的1.75%時,混凝土的裂縫最大修復寬度達到最大。
[Abstract]:Self-repairing technology based on microbial mineralization deposition can effectively realize self-diagnosis and self-repair of concrete cracks. However, if the amount of nutrients necessary in the process of microbial mineralization in concrete is insufficient, the self-repairing effect of cracks may be restricted. A new type of crack self-repairing concrete was developed with Bacillus spp as self-repairing agent and expanded perlite as the carrier. The effect of calcium lactate content on self-repairing of concrete cracks based on the mineralized deposit of Bacillus sp. The experimental results show that after 28 days of repair and maintenance, the developed self-repairing concrete has excellent self-repairing ability, and the maximum crack width of 0.67 mm, is 2.23 times of that of ordinary concrete. With the increase of calcium lactate content, the self-repairing ability of concrete cracks increased first and then tended to steady. When the content of calcium lactate is 1.75% of the mass fraction of the cementing material, the maximum crack repair width of the concrete reaches the maximum.
【作者單位】： 太原理工大學建筑與土木工程學院;
【基金】：國家自然科學基金青年基金(51508370) 中國博士后科學基金面上項目(2016M591416) 山西省科技攻關項目(20150313014-1)資助
【分類號】：TU528

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