Sales Hotline: 0571-28888881 wechat mobile phone: 13388426868 in December 2019, CCTV exposed a building under construction in Yiwu City, Zhejiang Province, and the beam and column cement fell off as soon as it was dug by hand
. 
In November 2019, Changsha City, Hunan Province reported the “problem concrete incident”, and the strength of concrete members of some floors did not meet the design requirements
. 
At the ongoing national two sessions, the proposal on construction quality has aroused widespread concern
. 
A few days ago, Tian Chunyan, deputy to the National People’s Congress and chief engineer of Beijing Construction Engineering Quality third Testing Institute Co., Ltd., introduced a number of suggestions she brought to this year’s NPC and CPPCC sessions in an exclusive interview with reporters
. 
One of them is to call for a sound quality supervision system for the production of precast concrete components, so as to promote the healthy development of prefabricated construction industry
. 
Tian Chunyan, deputy to the National People’s Congress and chief engineer of Beijing Construction Engineering Quality third Testing Institute Co., Ltd., “in the case of lower profits, the number of people and property invested in technological innovation and quality management will inevitably decrease, and the product quality is difficult to guarantee.” Tian Chunyan also found such “signs” in her work: in terms of appearance quality, some precast concrete members are lack of edges and corners, warped and uneven, cracked and broken; in terms of internal quality, there are inaccurate positioning of reinforcement and unreasonable mix proportion of concrete Tian Chunyan suggested that after clarifying the regulatory responsibility, the relevant responsible parties should strengthen the supervision of the quality of prefabricated components and severely crack down on violations
. 
At the same time, actively explore the concrete precast component product certification system, through the production enterprise quality management system, production process, product quality and other aspects of certification, from the source to promote the quality of concrete precast component products
. 
In addition, Zhou Lan, member of the National Committee of the Chinese people’s Political Consultative Conference, member of the Standing Committee of the Central Committee of the Jiusan Society, chairman of the Jiangsu Provincial Committee of the Jiusan Society, and director of the Jiangsu Provincial Department of housing and urban rural development, paid close attention to the problem of housing safety, and brought “proposals on the overall development and safety, including the housing safety status into the real estate transaction, mortgage and real estate registration management”, pointing out that the quality control system of rural housing construction should be established as soon as possible
.
Zhou Lan, member of the National Committee of the Chinese people’s Political Consultative Conference and director of the Department of housing and urban rural development of Jiangsu Province, is an important basic building material
.
The quality of the products directly determines the quality of the whole building, so we should not be careless
.
However, it is found that in the recent reports of cement quality sampling inspection results, unqualified products still appear frequently, covering more than ten provinces and autonomous regions
.
Once these unqualified products enter the market and are applied in construction, the hidden quality risks will be obvious
.
On January 28, the official website of the State Administration of Market Supervision announced the state supervision and spot check on the quality of 37 kinds of products including cement in 2020
.
Among them, 440 batches of cement products produced by 439 enterprises in 27 provinces (autonomous regions and municipalities) were randomly selected, and 24 batches were unqualified, with the unqualified detection rate of 5.5%
.
In this spot check of cement products, 12 items such as sulfur trioxide, magnesium oxide, loss on ignition, insoluble matter, chloride ion, setting time, stability, strength, water-soluble chromium (VI), radioactivity, fineness and water retention rate were inspected
.
The unqualified items include sulfur trioxide, chloride ion, loss on ignition and water-soluble chromium (VI)
.
According to the provincial supervision and spot check results of cement product quality in 2020 by Shandong market supervision and Administration Bureau, four batches of po42.5 products of four enterprises did not meet the requirements of relevant standards, and the unqualified items were chloride ion, loss on ignition, water-soluble chromium (VI) and other items
.
A few days ago, Chongqing market supervision and Administration Bureau released the results of cement product spot check, involving 68 batches of products from 43 production enterprises in 28 districts and counties, including Beibei District, Bishan District, Nanchuan District, Dianjiang County, Shizhu County and Wulong district
.
After inspection, 63 batches were qualified, 5 batches were unqualified, and the unqualified rate was 7.4%
.
The unqualified items were water-soluble chromium Compressive strength
.
According to the list of unqualified cement, the unqualified enterprises include Chongqing Jiuxin cement (Group) Co., Ltd., Chongqing Dianjiang kunsha Cement Co., Ltd., Kaixian Kaizhou Cement Co., Ltd
.
and Pengshui Maotian Energy Development Co., Ltd
.
in five batches, including four batches of 42.5-grade cement and one batch of 32.5-grade cement, with production dates of 2020 In July of this year
.
A few days ago, the market supervision bureau of Guangxi Zhuang Autonomous Region issued a supervision and spot check on the quality of 25 kinds of products
.
Among them, a total of 147 batches of cement products from 115 enterprises (sellers) were randomly selected, and 2 batches of unqualified products were found, with a detection rate of 1.4%
.
The unqualified items involve loss on ignition
.
List of unqualified products in random inspection Jiangsu provincial market supervision and Administration Bureau issued a circular on the second batch of provincial product quality supervision and random inspection in 2020
.
Among them, 100 batches of cement products were selected, 99 batches were qualified, and the qualified rate was 99%
.
The unqualified products of Xuzhou Zhongxin cement grinding Co., Ltd
.
were inspected, and the unqualified item was one index of chloride ion content
.
A few days ago, the market supervision bureau of Hubei Province issued a circular on the results of quality supervision and spot check of 147 kinds of products such as building materials
.
As for cement, 116 batches of cement were randomly selected, and one batch of products was found to be unqualified, with a detection rate of 0.87%
.
The unqualified item was water-soluble hexavalent chromium
.
A few days ago, the market supervision bureau of Foshan City, Guangdong Province, issued the “Circular on the results of random inspection of the quality supervision of building materials products in 2020”
.
The spot check found that the compressive strength and flexural strength of two batches of cement products were unqualified
.
The main reasons for the disqualification are that the technical control of the manufacturer is not strict, and the amount of mixed materials is too much, resulting in low strength and failing to meet the requirements of the nominal strength grade
.
Compressive and flexural strength is an important index to evaluate the quality of cement, and it is also the basic basis to evaluate the strength grade of cement
.
As one of the important building materials, the quality of cement has a great relationship with the quality of construction engineering, the protection of national property and the safety of people’s lives
.
If the cement with unqualified strength is used in the construction engineering, it will affect the quality of the project, make the building have potential safety hazards, and even cause the building collapse
.
According to the announcement on the quality supervision and spot check of 17 kinds of products such as fertilizer in 2020 released by the website of Guizhou market supervision and Administration Bureau, 130 batches of cement products produced by 94 enterprises were supervised and spot checked
.
After inspection, it was found that one batch of products produced by one enterprise was unqualified, as follows: in addition, the quality spot check of concrete industry is also in progress
.
In January, the Ministry of housing and urban rural development (MOHURD) issued the notice on special spot check of ready mixed concrete quality in 2020
.
The MOHURD conducted special spot check of ready mixed concrete quality on 30 construction projects under construction and 30 ready mixed concrete production enterprises in 10 provinces (cities) of Tianjin, Hebei, Anhui, Jiangxi, Shandong, Henan, Hunan, Hainan, Chongqing and Guizhou
.
A total of 1844 items were inspected in this special spot check, of which 1412 items were in conformity, and the coincidence rate of inspection items was 76.6%
.
Among them, there are 709 items in production and 703 items in use, with the inspection rate of 74.4% and 78.9% respectively
.
A total of 440 written feedback inspection comments, including 257 involving ready mixed concrete enterprises, accounting for 58.4%..
.
