西安建筑科技大学学报(自然科学版)

以矿粉为原材料,通过碱激发的方式制备胶凝材料,拌以海水和珊瑚骨料制备碱激发矿粉海水珊瑚骨料混凝土.首先通过碱激发矿粉海水珊瑚砂浆试验确定了合理的水胶比.进而通过改变珊瑚骨料相对于普通骨料的替代量,发现碱激发矿粉混凝土强度随普通骨料替代量的增加而不断降低.基于此,提出了提高混凝土的砂率、增大浆体对骨料的包裹作用,以提高碱激发全珊瑚骨料混凝土的强度.本文确定砂率为60%,提出了碱激发矿粉海水珊瑚骨料混凝土的合理配合比,并进行了基本力学性能试验.结果表明,由于海水与珊瑚骨料的早强作用,该新型混凝土7 d的抗压强度与抗拉强度均达到28 d的70%以上.且轴心抗压强度与立方体抗压强度的比明显高于普通混凝土.

Alkali-activated slag was used as cementing materials to produce seawater coral aggregate concrete in the present study. Proper water-to-binding materials ratio was first determined by test of seawater coral alkali-activated slag mortar. Then the strength of alkali-activated slag concrete is reduced as the replacement level of crushed stones by coral aggregates increases. Thus, it is necessary to improve the coral sand ratio(SP)and enveloping effect on the aggregates to increase the strength of seawater coral alkali-activated slag concrete(SCASC). The rational mix proportion of SCASC was then determined by setting the SP as 60% and the test on basic mechanical properties of SCASC was carried out. Results show that both the compressive strength and tensile strength at 7-day are more than 70% of those at 28-day. Moreover, the ratio of the uniaxial compressive strength to the cubic compressive strength is significantly larger than that in ordinary concrete.

引言
1 试验材料
2 碱激发矿粉海水珊瑚骨料砂浆力学性能研究
3 碱激发矿粉海水珊瑚骨料混凝土力学性能研究
4 结论

图1 试验用珊瑚礁石<br/>Fig.1 Coral aggregates for test

图1 试验用珊瑚礁石
Fig.1 Coral aggregates for test

表1 珊瑚礁石质量检测与评价
Tab.1

表2 珊瑚砂质量检测与评价<br/>Tab.2 Detection and assessment on the quality of coral sand

表2 珊瑚砂质量检测与评价
Tab.2 Detection and assessment on the quality of coral sand

图2 试验用珊瑚砂
Fig.2 Coral sand for test

图3 珊瑚礁石微观形态(放大500倍)<br/>Fig.3 SEM image of coral aggregate(Mag=500)

图3 珊瑚礁石微观形态(放大500倍)
Fig.3 SEM image of coral aggregate(Mag=500)

表3 矿粉主要氧化物含量<br/>Tab.3 Main chemical compositions of the GGBFS/%

表3 矿粉主要氧化物含量
Tab.3 Main chemical compositions of the GGBFS/%

表4 水玻璃的主要技术指标<br/>Tab.4 Main parameters of sodium silicate

表4 水玻璃的主要技术指标
Tab.4 Main parameters of sodium silicate

表5 人工拌合海水的配比<br/>Tab.5 Chemical compositions of artificial seawater(g/L)

表5 人工拌合海水的配比
Tab.5 Chemical compositions of artificial seawater(g/L)

表6 碱激发矿粉海水珊瑚砂浆的配比及相应稠度和基本力学性能<br/>Tab.6 Mix design, consistency and basic mechanical property of seawater coral alkali-activated slag mortar

表6 碱激发矿粉海水珊瑚砂浆的配比及相应稠度和基本力学性能
Tab.6 Mix design, consistency and basic mechanical property of seawater coral alkali-activated slag mortar

表7 珊瑚骨料替代率对新拌砂浆抗压强度的影响<br/>Tab.7 Impact of the replacement level of coral aggregates on compression strength of SCASC

表7 珊瑚骨料替代率对新拌砂浆抗压强度的影响
Tab.7 Impact of the replacement level of coral aggregates on compression strength of SCASC

表8 珊瑚砂砂率对新拌混凝土抗压强度的影响<br/>Tab.8 Impact of coral sand ratio on compression strength of SCASC

表8 珊瑚砂砂率对新拌混凝土抗压强度的影响
Tab.8 Impact of coral sand ratio on compression strength of SCASC

表9 珊瑚骨料的替代率对新拌混凝土抗压强度的影响<br/>Tab.9 Impact of adding amount of alkali on compression strength of SCASC

表9 珊瑚骨料的替代率对新拌混凝土抗压强度的影响
Tab.9 Impact of adding amount of alkali on compression strength of SCASC

表10 碱激发矿粉海水珊瑚骨料混凝土配合比<br/>Tab.10 Matching ration of seawater coral alkali-activated slag concrete

表10 碱激发矿粉海水珊瑚骨料混凝土配合比
Tab.10 Matching ration of seawater coral alkali-activated slag concrete

表11 碱激发矿粉海水珊瑚骨料混凝土基本力学性能<br/>Tab.11 Basic mechanical property of seawater coral alkali-activated slag concrete

表11 碱激发矿粉海水珊瑚骨料混凝土基本力学性能
Tab.11 Basic mechanical property of seawater coral alkali-activated slag concrete

图4 混凝土立方体抗压破坏情况<br/>Fig.4 Failure mode of SCASC after cube compressive strength test

图4 混凝土立方体抗压破坏情况
Fig.4 Failure mode of SCASC after cube compressive strength test

图5 混凝土轴心抗压破坏情况<br/>Fig.5 Failure mode of SCASC after uniaxial compressive strength test

图5 混凝土轴心抗压破坏情况
Fig.5 Failure mode of SCASC after uniaxial compressive strength test

图6 混凝土立方体劈裂破坏情况<br/>Fig.6 Failure mode of SCASC after splitting test

图6 混凝土立方体劈裂破坏情况
Fig.6 Failure mode of SCASC after splitting test

图7 混凝土试件抗折破坏情况<br/>Fig.7 Failure mode of SCASC after bending test

图7 混凝土试件抗折破坏情况
Fig.7 Failure mode of SCASC after bending test

[1] 张人为. 用循环经济理念大力推广水泥窑纯低温余热发电 [J]. 中国水泥, 2006(6): 8-11.
[2] 史才军, 巴维尔·克利文科, 黛拉·罗伊. 碱-激发水泥和混凝土 [M]. 北京: 化学工业出版社, 2008.
[3] 靡人杰, 余红发, 麻海燕,等. 全珊瑚骨料海水混凝土力学性能试验研究 [J]. 海洋工程, 2016(34): 47-54. MI R J, YU H F, MA H Y, et al. Study on mechanical property of coral concrete [J]. The Ocean Engineering, 2016(34): 47-54.
[4] RICK A E. Coral concrete at bikini atoll [J]. Concrete International, 1991, 13(1): 19-24.
[5] LI Y L, ZHAO X L, RAMAN Singh R K, et al. Thermal and mechanical properties of alkali-activated slag paste, mortar and concrete utilising seawater and sea sand [J]. Construction and Building Materials, 2018, 159: 704-724.
[6] 喻骁, 胡爱宇. 氢氧化钠与硅酸钠对矿渣活性的激发效果浅析[J]. 浙江建筑, 2012, 29(7): 48-51.
[7] 建筑砂浆基本性能试验方法标准:JGJ/T 70-2009[S]. 北京: 中国建筑工业出版社, 2009.
[8] 普通混凝土力学性能试验方法标准:GB/T 50081-2002[S].北京: 中国建筑工业出版社, 2002.
[9] YANG S T, YANG C, HUANG M L, et al. Study on bond performance between FRP bars and seawater coral aggregate concrete [J]. Construction and Building Materials, 2018, 173: 272-288.
[10]刘巽伯, 杨正宏, 计亦奇. 轻骨料混凝土抗压强度浅析[C]// 中国建筑学会建筑建筑材料分会2011年学术交流会议论文集. 常州:中国建筑学会建筑材料分会. 2012:296-301.

备注

引言

1 试验材料

2 碱激发矿粉海水珊瑚骨料砂浆力学性能研究

3 碱激发矿粉海水珊瑚骨料混凝土力学性能研究

4 结论

期刊信息