水泥砂浆弹性模量随温度的演化规律
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摘要
弹性模量作为水泥砂浆重要的性能参数和结构设计参数,对于保障构件的服役安全性和可靠性至关重要。为解决水泥砂浆在低温与高温服役条件下的弹性模量准确测量的技术难题,将修正缺口环法与相对法结合(称为修正缺口环相对法),成功测得了硅酸盐水泥砂浆在-70～800℃下的弹性模量,并研究了饱水与干燥砂浆试样的弹性模量随温度变化的演变规律。测试结果表明:由室温降至-70℃,冰的填充与胶粘作用会使得饱水砂浆的弹性模量增加32. 67%,且模量增长速率随着温度的降低逐渐增大;而干燥砂浆的水分含量较低,其弹性模量在降温过程中基本保持不变。由室温升至800℃过程中,由于水化产物的高温脱水分解与微结构劣化,饱水砂浆的弹性模量降低了93. 78%,而干燥砂浆的弹性模降低了83. 51%,且模量衰减速率随着温度的升高而逐渐降低。
As a crucial performance parameter and structural design parameter of the cement mortar,the elastic modulus is of great importance to ensure safety and reliability of the cement-based components in service. Aiming at conquering the technical problem that the elastic modulus of cement mortar under low and high temperature service conditions cannot be measured accurately,an innovative method( named as the relative modified split ring method) combining the modified split ring method and the relative method was employed in this study,the elastic modulus of Portland cement mortar at-70—800 ℃ was successfully measured. Besides,the evolution law of elastic modulus of water-saturated and dry mortar samples as a function of temperature is investigated. The results indicated that there was a 32. 67% increase of elastic modulus of watersaturated mortar,in the range from ambient temperature to-70 ℃,owing to the filling effect and gluing effect of the ice,and the growth rate of modulus increased gradually with the drop of test temperature. While the modulus of the dry piece remained unchanged in the process of cooling,thanks to its low water content. Due to the dehydration and decomposition of the hydration products and the microstructure degradation at high temperature,the elastic modulus of the water-saturated and dry samples declined by 93. 78% and 83. 51%,respectively,with the increasing temperature from room temperature to 800 ℃. And the modulus decreasing velocity was gradually reduced with increase of test temperature.
As a crucial performance parameter and structural design parameter of the cement mortar,the elastic modulus is of great importance to ensure safety and reliability of the cement-based components in service. Aiming at conquering the technical problem that the elastic modulus of cement mortar under low and high temperature service conditions cannot be measured accurately,an innovative method( named as the relative modified split ring method) combining the modified split ring method and the relative method was employed in this study,the elastic modulus of Portland cement mortar at-70—800 ℃ was successfully measured. Besides,the evolution law of elastic modulus of water-saturated and dry mortar samples as a function of temperature is investigated. The results indicated that there was a 32. 67% increase of elastic modulus of watersaturated mortar,in the range from ambient temperature to-70 ℃,owing to the filling effect and gluing effect of the ice,and the growth rate of modulus increased gradually with the drop of test temperature. While the modulus of the dry piece remained unchanged in the process of cooling,thanks to its low water content. Due to the dehydration and decomposition of the hydration products and the microstructure degradation at high temperature,the elastic modulus of the water-saturated and dry samples declined by 93. 78% and 83. 51%,respectively,with the increasing temperature from room temperature to 800 ℃. And the modulus decreasing velocity was gradually reduced with increase of test temperature.
引文
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12 ISO 18558:2015(E)Fine ceramics(advanced ceramics,advanced technical ceramics)—Test method for determining elastic modulus and bending strength of ceramic tube and rings.
13 刘鸿文.材料力学下册,第三版.高等教育出版社,1992.
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18 Yan J B,Xie J. Construction and Building Materials,2017,141,410.
19 Chatterji S. Cement and Concrete Research,1999,29,627.
20 Pineaud A,Pimienta P,Rémond S,et al. Construction and Building Materials,2016,112,747.
21 Xiong M X,Liew J Y R. Materials and Design,2016,104,414.
22 Odelson J B,Kerr E A,Vichit-Vadakan W. Cement and Concrete Research,2007,37,258.
23 Siddiqui M S,Grasley Z,Fowler D W. Construction and Building Materials,2016,112,996.
2 Kogbara R B,Iyengar S R,Grasley Z C,et al. Construction and Building Materials,2013,47,760.
3 Dahmani L. Strength of Materials,2011,43(5),526.
4 Farzadnia N,Ali A A A,Demirboga R. Cement and Concrete Research,2013,54,43.
5 Gencel O. Fire and Materials,2012,36,217.
6 Hassen S,Colina H. Materials and Structures,2012,45,1861.
7 Zheng L,Huo X S,Yuan Y. Construction and Building Materials,2008,22(5),939.
8 Rao S K,Sravana P,Rao T C. International Journal of Pavement Research and Technology,2016,9,289.
9 ASTM C580-02,Standard Test Method for Flexural Strength and Modulus of Elasticity of Chemical Resistant Mortars,Grouts,Monolithic Surfacings,and Polymer Concretes.
10 Wan D T,Bao Y W,Liu X G,et al. Advanced Materials Research,2011,177,114.
11 Bao Y W,Nie G L,Wan D T. Journal of the Chinese Ceramic Society,2017,45(8),1054(in Chinese).包亦望,聂光临,万德田.硅酸盐学报,2017,45(8),1054.
12 ISO 18558:2015(E)Fine ceramics(advanced ceramics,advanced technical ceramics)—Test method for determining elastic modulus and bending strength of ceramic tube and rings.
13 刘鸿文.材料力学下册,第三版.高等教育出版社,1992.
14 Beer F P,Johnston E R,Dewolf J T,et al. Mechanics of Materials.Sixth edition,America:Mc Graw-Hill,2012.
15 Liu Z,Bao Y W,Wan D T,et al. Ceramics International,2015,41,12835.
16 Wang W Y. Cement,2000(7),1(in Chinese).王文义.水泥,2000(7),1.
17 Liu X M,Zhang M H,Chia K S,et al. Cement and Concrete Composites,2016,73,289.
18 Yan J B,Xie J. Construction and Building Materials,2017,141,410.
19 Chatterji S. Cement and Concrete Research,1999,29,627.
20 Pineaud A,Pimienta P,Rémond S,et al. Construction and Building Materials,2016,112,747.
21 Xiong M X,Liew J Y R. Materials and Design,2016,104,414.
22 Odelson J B,Kerr E A,Vichit-Vadakan W. Cement and Concrete Research,2007,37,258.
23 Siddiqui M S,Grasley Z,Fowler D W. Construction and Building Materials,2016,112,996.
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