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养护条件对MgO膨胀剂膨胀性能的影响
The Effect of Different Curing Conditions on the Expansive Properties of MgO Expansive Agent
2021年第1期
MgO膨胀剂;限制膨胀率;膨胀性能;孔隙率
Magnesium oxide expansive agent; Restrained expansion rate; Expansive property; Porosity
2021年第1期
10.19761/j.1000-4637.2021.01.034.05
国家自然科学基金资助项目(51878400、51678344)。
周龙龙,王 舜,苗 苗,冯竟竟,李思琪,孙传珍
山东农业大学 水利土木工程学院,山东 泰安 271018

周龙龙,王 舜,苗 苗,冯竟竟,李思琪,孙传珍

周龙龙,王舜,苗苗,等.养护条件对MgO膨胀剂膨胀性能的影响[J].混凝土与水泥制品,2021(1):34-38

ZHOU L L,WANG S,MIAO M,et al.The Effect of Different Curing Conditions on the Expansive Properties of MgO Expansive Agent[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):34-38.

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摘   要:对水养、水养转干养和干湿循环养护条件下不同活性MgO膨胀剂(MEA)膨胀性能及水养条件下不同龄期膨胀净浆微观孔结构进行了研究。结果表明:MEA活性越高,其早期膨胀率增速越大,但后期膨胀率增速越慢;水养转干养条件下,干空膨胀落差与MEA活性成正比;干湿循环养护条件下,高活性MgO的补偿收缩效能高于低活性MgO。掺MEA浆体中大于50 nm孔隙的增加可能是砂浆产生膨胀的原因之一;28~180 d时,MEA主要细化的孔区间为20~200 nm。 Abstract: The expansion properties of different active MgO expansive agent (MEA) under the conditions of water curing, water curing to dry curing and dry and wet cycle curing and micro pore structure of different age expansive paste under water condition were studied. The results show that the higher the activity of MEA, the higher the early expansion rate, but the slower the later expansion rate. Under the condition of water curing to dry curing, dry air expansion drop is directly proportional to MEA activity. Under the condition of dry and wet cycle curing, the compensation contraction efficiency of high active MgO is higher than that of low active MgO. The addition of MEA promotes the increase of pores larger than 50 nm in the paste, which may be one of the reasons for the expansion of the mortar. At the age of 28 to 180 days, the main refining pores of MEA are between 20 nm and 200 nm.
英文名 : The Effect of Different Curing Conditions on the Expansive Properties of MgO Expansive Agent
刊期 : 2021年第1期
关键词 : MgO膨胀剂;限制膨胀率;膨胀性能;孔隙率
Key words : Magnesium oxide expansive agent; Restrained expansion rate; Expansive property; Porosity
刊期 : 2021年第1期
DOI : 10.19761/j.1000-4637.2021.01.034.05
文章编号 :
基金项目 : 国家自然科学基金资助项目(51878400、51678344)。
作者 : 周龙龙,王 舜,苗 苗,冯竟竟,李思琪,孙传珍
单位 : 山东农业大学 水利土木工程学院,山东 泰安 271018

周龙龙,王 舜,苗 苗,冯竟竟,李思琪,孙传珍

周龙龙,王舜,苗苗,等.养护条件对MgO膨胀剂膨胀性能的影响[J].混凝土与水泥制品,2021(1):34-38

ZHOU L L,WANG S,MIAO M,et al.The Effect of Different Curing Conditions on the Expansive Properties of MgO Expansive Agent[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):34-38.

摘要
参数
结论
参考文献
引用本文

摘   要:对水养、水养转干养和干湿循环养护条件下不同活性MgO膨胀剂(MEA)膨胀性能及水养条件下不同龄期膨胀净浆微观孔结构进行了研究。结果表明:MEA活性越高,其早期膨胀率增速越大,但后期膨胀率增速越慢;水养转干养条件下,干空膨胀落差与MEA活性成正比;干湿循环养护条件下,高活性MgO的补偿收缩效能高于低活性MgO。掺MEA浆体中大于50 nm孔隙的增加可能是砂浆产生膨胀的原因之一;28~180 d时,MEA主要细化的孔区间为20~200 nm。

Abstract: The expansion properties of different active MgO expansive agent (MEA) under the conditions of water curing, water curing to dry curing and dry and wet cycle curing and micro pore structure of different age expansive paste under water condition were studied. The results show that the higher the activity of MEA, the higher the early expansion rate, but the slower the later expansion rate. Under the condition of water curing to dry curing, dry air expansion drop is directly proportional to MEA activity. Under the condition of dry and wet cycle curing, the compensation contraction efficiency of high active MgO is higher than that of low active MgO. The addition of MEA promotes the increase of pores larger than 50 nm in the paste, which may be one of the reasons for the expansion of the mortar. At the age of 28 to 180 days, the main refining pores of MEA are between 20 nm and 200 nm.

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(1)水养条件下,MgO活性越高其早期膨胀率增长速度越快,但后期其膨胀率增速越慢。
(2)水养转干养条件下,干空膨胀落差与MEA活性有关,MEA活性越高,干空膨胀落差越大。
(3)干湿循环养护条件下,高活性MgO的补偿收缩效能高于低活性MgO。
(4)MEA的掺加导致浆体中大于50 nm孔隙的增加,掺高活性MEA浆体中大于50 nm的孔明显多于掺低活性MEA浆体,这可能是掺有MEA浆体产生膨胀的原因之一。
(5)28~180 d时,MEA主要细化孔的区间为20~200 nm;长龄期时,MEA水化产物的生成有效细化了孔隙。

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周龙龙,王舜,苗苗,等.养护条件对MgO膨胀剂膨胀性能的影响[J].混凝土与水泥制品,2021(1):34-38

ZHOU L L,WANG S,MIAO M,et al.The Effect of Different Curing Conditions on the Expansive Properties of MgO Expansive Agent[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(1):34-38.

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