高温煅烧对新疆和田地区火山岩活性影响试验  

Experimental study on the effects of high-temperature calcination on volcanic rock activity in Hotan area of Xinjiang

作　　者：王怀义 杨桂权 贺传卿 王刚 WANG Huaiyi;YANG Guiquan;HE Chuanqing;WANG Gang(Xinjiang Research Institute of Water Resources and Hydroelectricity Science,Urumqi 830049,China;Xinjiang Water Conservancy and Hydropower material Engineering Technology Research Center,Urumqi 830049,China;College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆水利水电科学研究院,新疆乌鲁木齐830049 [2]新疆水利水电材料工程技术研究中心,新疆乌鲁木齐830049 [3]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052

出　　处：《河海大学学报（自然科学版）》2020年第1期60-65,共6页Journal of Hohai University(Natural Sciences)

基　　金：新疆自然科学基金(2019D01A74)。

摘　　要：为了提高新疆和田地区火山岩的火山灰活性,拓展其在混凝土工程中的应用,通过采用XRD、化学法、SEM微观及宏观强度指数法等多种测试手段,对经温度从800℃至1400℃的煅烧,恒温保持0~60 min,且经水淬或自然冷却的和田地区火山岩的火山灰活性进行测试分析。结果表明:(a)随煅烧温度的提高,火山岩中的玻璃质含量逐步提升,但当煅烧温度达到或超过其熔融温度后,虽XRD中晶体衍射峰明显消失,但玻璃质含量则开始下降;(b)火山岩中的主要氧化物SiO 2、Al 2O 3、Fe 2O 3及可溶出的2种氧化物SiO 2和Al 2O 3的含量,除煅烧温度800℃外,均有所下降;(c)煅烧温度若超过800℃,更高的煅烧温度会造成火山岩宏观活性指数下降。由此可知,高温煅烧可以一定程度地提高火山岩玻璃质含量,但过高的煅烧温度会使火山岩可溶出氧化物含量下降,并造成其宏观活性指数下降。In order to improve the pozzolanic activity of volcanic rock in Hotan area of Xinjiang and extend its application in concrete engineering,XRD test,chemical method,SEM micro and macro strength index method are adopted,to test and analyze the pozzolanic activity after 0-60 min calcination of constant temperatures from 800℃to 1400℃and with water quenching or natural cooling.Results indicate that with the increase of calcination temperature,the vitreous content of volcanic rocks gradually increased.But when the calcination temperature reaches or exceeds the melting temperature,the crystal diffraction peak obviously disappeared in the XRD test and the vitreous content began to decrease.The content of main oxides in volcanic rock,such as SiO 2,Al 2 O 3 and Fe 2 O 3,decreased,and all the contents of two soluble oxides,SiO 2 and Al 2 O 3,have decreased except the calcination temperature of 800℃.Finally,too high calcination temperature,over 800℃,will result in decreased activity,and the vitreous content of volcanic rocks can be improved to a certain extent by calcining with high temperature.However,high calcining temperature will reduce the dissolved oxide content of volcanic rocks and cause the decline of their macroscopic activity index.

关 键 词：火山岩 高温煅烧 火山灰活性 XRD 可溶氧化物 新疆和田地区 

分 类 号：TU521.21[建筑科学—建筑技术科学]