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Constitutive Relationship and Mechanical Properties of Manufactured Sand Concrete with Different Rocks(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年01期
Page:
99-106
Research Field:
Publishing date:

Info

Title:
Constitutive Relationship and Mechanical Properties of Manufactured Sand Concrete with Different Rocks
Author(s):
XIE Kai-zhong12 LIU Zhen-wei1 GE Bing-zhou1 XIN Ying1 ZHU Mao-jin1
(1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 2. Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, Guangxi, China) Analysis of Cracking of Concrete Floor Slabs in Steel-tube-bundle Structure
Keywords:
manufactured sand concrete river sand concrete uniaxial compression fineness modulus stone powder content elastic modulus
PACS:
TU528
DOI:
10.19815/j.jace.2020.05013
Abstract:
In order to study the mechanical properties of manufactured sand concrete(MSC)under uniaxial stress, taking three kinds of manufactured sand including limestone sand, pebble sand, basalt sand in Guangxi as fine aggregates, taking the concrete design strength grade as variable parameter, 24 standard prism concrete specimens(150 mm×150 mm×300mm)and 24 cube concrete specimens(150 mm×150 mm× 150 mm)were cast. Comparing with the river sand concrete(RSC), the uniaxial compression tests were carried. The compressive strength and stress-strain relation curves were obtained, and the uniaxial compression constitutive equations suitable for MSC were obtained. The formula of elastic modulus of MSC was presented by the test data. The results show that the failure modes of MSC with different lithologies are almost the same. The stress-strain curve of MSC is similar with that of RSC, in the rising stage of the curve, MSC and RSC have basically coincident curve, however, in descending stage, the curve of MSC is much steeper than that of RSC. The stress-strain curve of manufactured sand concrete fitted by Sargin model is in good agreement with the experimental curve. The mechanical properties of manufactured sand concrete are related to the physical properties of fine aggregate with different lithologies. With the increase of fineness modulus or stone powder content, the peak stress and peak strain of manufactured sand concrete show a trend of first increasing and then decreasing. The peak stress and peak strain of manufactured sand concrete show a trend of first increasing and then decreasing. The conversion coefficient of MSC is proposed to be 0.77 when the water cement ratio is 0.3-0.4. The elastic modulus of pebble sand concrete is higher than that of basalt sand concrete and limestone sand concrete.

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表3 机制砂混凝土配合比
Tab.3 Mix Proportions of MSC
混凝土强度 水灰比 砂率/% 材料用量/(kg·m-3)水 水泥 砂 碎石 减水剂C40 0.38 42 160 421 748 1 021 4.63C50 0.31 38 153 494 685 1 118 5.93

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Last Update: 2021-01-20